All tools
2004 free tools — everything runs in your browser, nothing is uploaded.
Calculators & Converters
Business & Marketing
Meat Roasting Time Calculator
Roasting times and safe internal temperatures by weight and doneness.
Electricity Bill Estimator
Turn watts and hours into a daily, monthly and yearly cost.
Electricity Cost Calculator
Add every appliance, set your tariff, and see daily, monthly and yearly running costs.
Contribution Margin Calculator
Instantly find your CM per unit, CM ratio, break-even point and operating leverage.
Current Ratio Calculator
Instant liquidity analysis: current ratio, quick ratio, cash ratio and net working capital.
EBITDA Calculator
Calculate EBITDA, margins, EV/EBITDA, and key leverage ratios instantly.
Economic Order Quantity (EOQ) Calculator
Find the optimal order size that minimises total inventory cost.
Payback Period Calculator
Find how long until your investment breaks even — simple and discounted methods.
Quick Ratio Calculator (Acid-Test)
Instantly measure short-term liquidity — does your business have enough liquid assets to cover current debts?
Return on Assets (ROA) Calculator
Measure how efficiently a business turns its asset base into profit.
Return on Equity Calculator
Calculate ROE — basic, DuPont 3-factor and DuPont 5-factor decomposition.
Working Capital Calculator
Measure liquidity: current ratio, quick ratio, cash conversion cycle and more.
Debt-to-Equity Ratio Calculator
Compute D/E ratio, net leverage, debt ratio and interest coverage from a balance sheet.
Electric Field Calculator
Solve E = k·Q/r², V = k·Q/r, F = qE and Gauss's Law with full working shown.
Photoelectric Effect Calculator
Calculate KE, stopping voltage, threshold frequency and wavelength using Einstein's equation KE = hf − φ.
Burn Rate & Runway Calculator
Know exactly how long your cash will last — and what to do about it.
Customer Acquisition Cost (CAC) Calculator
Calculate blended CAC, LTV:CAC ratio and payback period by channel.
MRR Calculator
Calculate Monthly Recurring Revenue, ARR, LTV and forward projections.
A/B Test Significance Calculator
Know whether your experiment result is real — two-proportion z-test with p-value, confidence interval and power check.
ARR Calculator
Calculate Annual Recurring Revenue, NRR, GRR and MRR bridge in seconds.
Average Order Value Calculator
Calculate AOV, compare periods and find the AOV needed to hit a revenue target.
CAC Payback Period Calculator
Find out how many months it takes to recover your customer acquisition cost.
Churn Rate Calculator
Calculate customer churn, MRR churn, LTV, and cohort retention — all in your browser.
Click-Through Rate (CTR) Calculator
Instantly calculate CTR, CPC, CPM, conversion rate and ROAS from your campaign data.
Conversion Rate Calculator
Calculate CVR, ROAS, CPA and test A/B significance in one place.
Cost Per Acquisition (CPA) Calculator
Calculate CPA, LTV, ROAS, CTR, payback period and campaign ROI in one place.
CPC Calculator — Cost Per Click, CTR, ROAS & CPA
Work out your CPC, CTR, CPM, CPA, ROAS and campaign profit in one place.
CPM Calculator
Calculate CPM, total ad spend, or impressions — plus CTR, CPC, CPL and ROAS.
Customer Lifetime Value Calculator
Calculate LTV, LTV:CAC ratio and CAC payback period instantly.
Customer Retention Rate Calculator
Calculate CRR, churn rate, and LTV from your customer counts — single period, trend, or industry benchmark.
Email Open Rate Calculator
Calculate open rate, CTR, CTOR, bounce rate and A/B significance for any email campaign.
Engagement Rate Calculator
Calculate ER by reach, followers, impressions or views — with platform benchmarks.
Gross Merchandise Value (GMV) Calculator
Calculate total marketplace transaction volume, take-rate revenue and net revenue across periods.
LTV to CAC Ratio Calculator
Measure unit economics — how much a customer is worth vs. what it costs to acquire them.
Net Promoter Score (NPS) Calculator
Calculate your NPS instantly from group counts or raw 0–10 survey responses.
ROAS Calculator
Calculate Return on Ad Spend — instantly see ROAS, break-even, POAS and net profit.
Startup Runway Calculator
See exactly how many months of cash you have left — and when revenue covers burn.
Bounce Rate Calculator
Calculate your bounce rate, engagement rate and improvement projection — instantly.
Monthly Active Users (MAU) Calculator
Track MAU growth, churn, stickiness and 30-day retention across multiple periods.
Viral Coefficient Calculator
Calculate K-factor and model exponential growth wave by wave.
Tax & Wages
VAT & Sales Tax Calculator
Add or remove VAT, GST or sales tax for any country.
Take-Home Pay & Salary Tax Calculator
Net salary after income tax and social contributions — UK, US, Germany.
Georgia (GEL) Salary & Take-Home Pay Calculator
Net salary after Georgia's flat 20% income tax and 2% pension.
Bangladesh Income Tax Calculator (FY 2024-25, NBR)
আয়কর হিসাব করুন — calculate your Bangladesh income tax instantly.
Saudi Arabia & UAE VAT Calculator (GCC) — Arabic RTL Friendly
Add or extract VAT for Saudi Arabia, UAE, Bahrain and Oman — with Arabic RTL layout.
Austria USt Calculator (Umsatzsteuer) 2025
Add or extract Austria Umsatzsteuer at 20% — instant result in your browser.
Canada GST Calculator (Goods and Services Tax) 2025
Add or extract Canada Goods and Services Tax at 5% — instant result in your browser.
Czech Republic DPH Calculator (Daň z přidané hodnoty) 2025
Add or extract Czech Republic Daň z přidané hodnoty at 21% — instant result in your browser.
Denmark Merværdiafgift Calculator (Moms) 2025
Add or extract Denmark Moms at 25% — instant result in your browser.
Egypt VAT Calculator (Value Added Tax) 2025
Add or extract Egypt Value Added Tax at 14% — instant result in your browser.
Finland ALV Calculator (Arvonlisävero) 2025
Add or extract Finland Arvonlisävero at 25.5% — instant result in your browser.
Ghana VAT Calculator (Value Added Tax) 2025
Add or extract Ghana Value Added Tax at 15% — instant result in your browser.
Greece ΦΠΑ / FPA Calculator (Φόρος Προστιθέμενης Αξίας) 2025
Add or extract Greece Φόρος Προστιθέμενης Αξίας at 24% — instant result in your browser.
Hungary ÁFA Calculator (Általános Forgalmi Adó) 2025
Add or extract Hungary Általános Forgalmi Adó at 27% — instant result in your browser.
Portugal IVA Calculator (Imposto sobre o Valor Acrescentado) 2025
Add or extract Portugal Imposto sobre o Valor Acrescentado at 23% — instant result in your browser.
Romania TVA Calculator (Taxa pe Valoarea Adăugată) 2025
Add or extract Romania Taxa pe Valoarea Adăugată at 19% — instant result in your browser.
Turkey KDV Calculator (Katma Değer Vergisi) 2025
Add or extract Turkey Katma Değer Vergisi at 20% — instant result in your browser.
Bolivia Income Tax Calculator 2025 — 13% Flat Rate
Calculate your Bolivia take-home pay under the 13% flat income tax — monthly or annual, instant result in your browser.
Bosnia and Herzegovina Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Bosnia and Herzegovina take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Bulgaria Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Bulgaria take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Estonia Income Tax Calculator 2025 — 20% Flat Rate
Calculate your Estonia take-home pay under the 20% flat income tax — monthly or annual, instant result in your browser.
Hungary Income Tax Calculator 2025 — 15% Flat Rate
Calculate your Hungary take-home pay under the 15% flat income tax — monthly or annual, instant result in your browser.
Kazakhstan Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Kazakhstan take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Mongolia Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Mongolia take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
North Macedonia Income Tax Calculator 2025 — 10% Flat Rate
Calculate your North Macedonia take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Romania Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Romania take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Russia Income Tax Calculator 2025 — 13% Flat Rate
Calculate your Russia take-home pay under the 13% flat income tax — monthly or annual, instant result in your browser.
Turkmenistan Income Tax Calculator 2025 — 10% Flat Rate
Calculate your Turkmenistan take-home pay under the 10% flat income tax — monthly or annual, instant result in your browser.
Vikram Samvat Converter
Convert between Gregorian (CE) and Vikram Samvat (VS) years.
GST Inclusive / Exclusive Calculator
Add or remove GST at any rate — see net, GST and gross.
Reverse Sales Tax Calculator
Strip VAT, GST or sales tax out of a tax-inclusive price.
Paycheck Budget Split
Split your pay into needs, wants and savings.
Paycheck Splitter
Split every paycheck across needs, wants and savings — 50/30/20 or your own rules.
GST Calculator
Add or remove GST and see the net, tax and gross amounts instantly.
Salary to Hourly Converter
Turn any annual salary into hourly, daily, weekly and monthly pay — or work it backwards.
US Sales Tax Calculator
Enter an amount and a state to get the sales tax and total — with a 50-state rate reference.
Overtime Pay Calculator
Turn a regular rate, base hours and one or more overtime multipliers into a full gross-pay breakdown.
Australia GST Calculator
Add or remove 10% GST instantly — with a full AUD breakdown.
Belgium VAT Calculator (TVA / BTW)
Add or remove Belgian VAT at 21%, 12%, 6% or 0% — instant net and gross breakdown.
Germany VAT Calculator (Mehrwertsteuer)
Add or remove German MwSt at 19%, 7%, or 0% — instant net/gross breakdown.
Ireland VAT Calculator
Add or remove Irish VAT instantly — 23%, 13.5%, 9% and 4.8% rates covered.
Italy VAT (IVA) Calculator
Add or remove Italian IVA at 22%, 10%, 5% or 4% — instant breakdown in euros.
New Zealand GST Calculator
Add or remove 15% NZ GST instantly — with a full breakdown.
Norway VAT (MVA) Calculator
Add or remove Norwegian merverdiavgift at 25%, 15%, and 12% in seconds.
Poland VAT Calculator
Add or remove Polish VAT (PTU) instantly — 23%, 8%, and 5% rates.
Singapore GST Calculator
Add or remove 9% GST in seconds — net, GST amount, and gross in one view.
Philippines VAT Calculator
Add or remove Philippine 12% EVAT — instant peso breakdown for any transaction.
UAE VAT Calculator
Add or remove UAE VAT at 5% or 0% — instant AED net/gross breakdown.
India GST Calculator — All Slabs: 5%, 12%, 18%, 28% + CGST/SGST Split
Add or extract GST at any slab rate with a full CGST/SGST/IGST breakdown.
Arizona Sales Tax Calculator 2025 — 5.6% State TPT Rate + Local
Add or remove Arizona sales tax with the real 5.6% state rate and editable local rate — instant browser calculation.
California Sales Tax Calculator
Add or reverse California sales tax in seconds — state 7.25% + your local rate.
Florida Sales Tax Calculator 2025 — 6% State Rate + County Surtax
Add or remove Florida sales tax instantly — state base rate preset, editable county surtax, full breakdown.
France VAT (TVA) Calculator
Add or remove French TVA at 20%, 10%, 5.5% or 2.1% — instant net/gross breakdown.
Illinois Sales Tax Calculator
Add or back out Illinois sales tax — state 6.25% plus your local rate.
Michigan Sales Tax Calculator 2025 — 6% Flat State Rate
Add or remove Michigan's flat 6% sales tax instantly — no local rate complications.
New York Sales Tax Calculator
Calculate NY sales tax instantly — add tax to a price or strip it from a total.
Netherlands VAT (BTW) Calculator
Add or remove Dutch BTW at 21%, 9% or 0% — instant net/gross breakdown.
Ohio Sales Tax Calculator
Instantly calculate Ohio sales tax — add tax to a price or back it out of a total.
Pennsylvania Sales Tax Calculator
Calculate PA sales tax — add it to a price or back it out from a total.
South Africa VAT Calculator
Add or remove 15% South African VAT instantly — net, VAT amount and gross in one click.
Spain VAT (IVA) Calculator
Add or remove Spanish IVA instantly — 21%, 10% and 4% rate bands covered.
Switzerland VAT (MWST) Calculator 2025 — 8.1%, 3.8%, 2.6%
Add or remove Swiss MWST at 8.1%, 3.8% or 2.6% — instant CHF breakdown in your browser.
Texas Sales Tax Calculator
Calculate Texas sales tax instantly — add tax to a price or back it out of a total.
Canada Sales Tax Calculator (GST/HST/PST) by Province 2025
Instantly calculate GST, HST, PST and QST for every Canadian province and territory.
Mexico VAT (IVA) Calculator — 16%, 8% Border Zone, 0%
Add or remove Mexican IVA at 16%, 8% border-zone, or 0% — full MXN breakdown instantly.
Saudi Arabia VAT Calculator
Add or remove 15% Saudi VAT instantly — net, VAT amount and gross in one click.
Missouri Sales Tax Calculator
Instantly calculate Missouri sales tax — add tax to a price or strip it from a total.
Massachusetts Sales Tax Calculator
Add or reverse Massachusetts sales tax instantly — state 6.25% + optional local meals rate.
Alabama Sales Tax Calculator 2025 — 4% State Rate + Local
Add or remove Alabama sales tax with the real 4% state rate and editable local rate — instant browser calculation.
Colorado Sales Tax Calculator 2025 — 2.9% State Rate + Local
Add or remove Colorado sales tax with the real 2.9% state rate and editable local rate — instant browser calculation.
Georgia Sales Tax Calculator 2025 — 4% State + Local Rate
Add or remove Georgia sales tax instantly — state 4% base plus editable local rate.
Indiana Sales Tax Calculator 2025 — 7% State Rate, No Local Tax
Add or remove Indiana sales tax with the real 7% state rate — instant browser calculation, no local tax complications.
Kenya VAT Calculator 2025 — 16% Standard & 8% Petroleum Rate
Add or remove Kenya VAT at the correct rate band — instant KSh breakdown in your browser.
New Jersey Sales Tax Calculator 2025 — 6.625% State Rate
Add or remove New Jersey sales tax instantly — state rate preset, editable local field, full breakdown.
North Carolina Sales Tax Calculator 2025 — 4.75% State Rate + Local
Add or remove NC sales tax instantly — state 4.75% base, editable county rate, full breakdown.
Nigeria VAT Calculator — 7.5% Value Added Tax (2025)
Add or remove Nigeria VAT at 7.5% — instant breakdown in your browser.
Sweden VAT (Moms) Calculator 2025 — 25%, 12%, 6%
Add or remove Swedish Moms instantly — all four rate bands, full SEK breakdown.
Washington Sales Tax Calculator
Add or reverse Washington sales tax — 6.5% state base rate + editable local rate.
Louisiana Sales Tax Calculator 2025 — 4.45% State Rate + Local
Add or remove Louisiana sales tax with the real 4.45% state rate and editable parish/city rate — instant browser calculation.
Maryland Sales Tax Calculator 2025 — 6% Flat State Rate
Add or remove Maryland sales tax instantly — 6% statewide, no local add-ons.
Minnesota Sales Tax Calculator
Add or reverse Minnesota sales tax instantly — state 6.875% + your local rate.
Tennessee Sales Tax Calculator 2025 — 7% State Rate + Local Rate
Add or remove Tennessee sales tax instantly — 7% state base preset, editable local rate, full breakdown.
Virginia Sales Tax Calculator 2025 — 4.3% State + Local Rate
Add or remove Virginia sales tax instantly — state 4.3% base plus editable local/regional rate.
South Carolina Sales Tax Calculator 2025 — 6% State Rate + Local
Add or remove SC sales tax instantly — state 6% base, editable county rate, full breakdown.
Wisconsin Sales Tax Calculator 2025 — 5% State Rate + Local
Add or remove Wisconsin sales tax using the real 5% state rate and an editable county/city rate — instant browser calculation.
Alabama Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Alabama (federal) minimum wage, with overtime.
Arizona Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Arizona's $14.70/hr minimum — plus overtime.
Arkansas Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Arkansas's $11.00/hr minimum wage — with overtime.
California Minimum Wage Calculator
Compute weekly, monthly and annual gross pay at California's $16.50/hr minimum — with overtime.
Florida Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Florida's $13/hr minimum — with overtime.
New York Minimum Wage Calculator
Compute gross pay at New York's $16.50/hr minimum wage — weekly, monthly, and annual.
Oregon Minimum Wage Calculator
Compute gross pay weekly, monthly and annually for all three Oregon wage tiers (July 2025) — with overtime.
Alaska Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Alaska's $11.91/hr rate — with overtime.
Colorado Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Colorado's $14.81/hr minimum wage, with overtime.
Connecticut Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at CT's $16.35/hr minimum wage — with overtime.
Hawaii Minimum Wage Calculator
Compute weekly, monthly and annual gross pay at Hawaii's $16/hr minimum — with overtime.
Illinois Minimum Wage Calculator
Compute weekly, monthly and annual gross pay at Illinois's $14/hr minimum — with overtime.
Maryland Minimum Wage Calculator
Compute gross pay at Maryland's $15.00/hr minimum — weekly, monthly, annual, with overtime.
Massachusetts Minimum Wage Calculator
Compute gross pay at the $15.00/hr MA minimum wage — weekly, monthly, annual, with overtime.
Michigan Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Michigan's $10.56/hr minimum wage, with overtime.
Missouri Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Missouri minimum wage, with overtime.
Montana Minimum Wage Calculator
Calculate gross pay at Montana's $10.55/hr minimum wage — weekly, monthly and annual.
New Jersey Minimum Wage Calculator
Instantly compute gross weekly, monthly, and annual pay at New Jersey's $15.49/hr minimum wage — with overtime.
New Mexico Minimum Wage Calculator
Compute weekly, monthly and annual gross pay at the New Mexico minimum wage — with overtime.
Nebraska Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Nebraska minimum wage of $13.50/hr, with overtime.
Ohio Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Ohio's $10.70/hr minimum wage, with overtime.
Maine Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Maine's $14.65/hr rate — with overtime.
Minnesota Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Minnesota's $11.13/hr minimum wage, with overtime.
Nevada Minimum Wage Calculator
Compute weekly, monthly and annual gross pay at Nevada's $12/hr minimum — with overtime.
Alabama Property Tax Calculator
Estimate your Alabama annual and monthly property tax from your home value and the state average effective rate.
Arizona Property Tax Calculator 2024 — Estimate Your Annual and Monthly Bill
Enter your home value and get an instant Arizona property-tax estimate using the real 0.51% statewide average effective rate.
California Property Tax Calculator
Estimate your annual and monthly California property tax using the real statewide average effective rate.
Colorado Property Tax Calculator
Estimate your annual and monthly Colorado property tax from your home value.
Florida Property Tax Calculator
Estimate your annual and monthly Florida property tax from home value and effective rate.
Georgia Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Georgia (federal) minimum wage — overtime included.
Georgia Property Tax Calculator
Estimate your annual and monthly property tax bill for any Georgia county.
Iowa Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Iowa minimum wage, with overtime.
Kentucky Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Kentucky (federal) minimum wage, with overtime.
Pennsylvania Minimum Wage Calculator
Compute PA gross weekly, monthly and annual pay with overtime at the current state minimum wage.
Texas Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Texas minimum wage with overtime.
Louisiana Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Louisiana (federal) minimum wage, with overtime.
Connecticut Property Tax Calculator
Estimate your annual and monthly CT property tax — with county breakdowns.
Idaho Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Idaho minimum wage, with overtime.
Illinois Property Tax Calculator
Estimate your Illinois annual and monthly property tax from your home value and the state average effective rate.
Indiana Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Indiana minimum wage, with overtime.
Kansas Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Kansas minimum wage, with overtime.
Massachusetts Property Tax Calculator
Estimate your Massachusetts annual and monthly property tax from your home value and the state average effective rate.
Michigan Property Tax Calculator
Estimate your Michigan annual and monthly property tax from your home value and the state average effective rate.
Mississippi Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Mississippi (federal) minimum wage, with overtime.
Missouri Property Tax Calculator
Estimate your Missouri annual and monthly property tax from your home value and the state average effective rate.
Nevada Property Tax Calculator
Estimate your Nevada annual and monthly property tax from your home value and the state average effective rate.
New Hampshire Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the New Hampshire (federal) minimum wage, with overtime.
New York Property Tax Calculator
Estimate your New York annual and monthly property tax from your home value and the state average effective rate.
North Carolina Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the North Carolina minimum wage, with overtime.
North Dakota Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the North Dakota (federal) minimum wage, with overtime.
Ohio Property Tax Calculator
Estimate your Ohio annual and monthly property tax from your home value and the state average effective rate.
Oklahoma Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Oklahoma (federal) minimum wage, with overtime.
Oregon Property Tax Calculator
Estimate your Oregon annual and monthly property tax from your home value and the state average effective rate.
South Carolina Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the South Carolina (federal) minimum wage, with overtime.
South Dakota Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the South Dakota minimum wage, with overtime.
Tennessee Property Tax Calculator
Estimate your Tennessee annual and monthly property tax from your home value and the state average effective rate.
Texas Property Tax Calculator
Estimate your Texas annual and monthly property tax from your home value and the state average effective rate.
Wisconsin Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Wisconsin minimum wage, with overtime.
Wyoming Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Wyoming minimum wage, with overtime.
Rhode Island Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at RI's $16.00/hr minimum wage — with overtime.
Minnesota Property Tax Calculator
Estimate your Minnesota annual and monthly property tax from your home value and the state average effective rate.
New Jersey Property Tax Calculator
Estimate your NJ annual and monthly property tax from your home value and the state average effective rate.
North Carolina Property Tax Calculator
Estimate your North Carolina annual and monthly property tax from your home value and the state average effective rate.
Pennsylvania Property Tax Calculator
Estimate your Pennsylvania annual and monthly property tax from your home value and the state average effective rate.
Tennessee Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Tennessee (federal) minimum wage, with overtime.
Utah Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Utah minimum wage, with overtime.
Virginia Property Tax Calculator
Estimate your Virginia annual and monthly property tax from your home value and the locality effective rate.
Washington State Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Washington's $16.66/hr minimum wage — with overtime.
Wisconsin Property Tax Calculator
Estimate your Wisconsin annual and monthly property tax from your home value and the state average effective rate.
Indiana Property Tax Calculator
Estimate your Indiana annual and monthly property tax from your home value and the state average effective rate.
Vermont Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the Vermont minimum wage, with overtime at 1.5x.
Washington Property Tax Calculator
Estimate your Washington annual and monthly property tax from your home value and the state average effective rate.
Virginia Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Virginia's $12.41/hr minimum wage, with overtime.
West Virginia Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at the West Virginia minimum wage of $8.75/hr, with overtime.
Kinematics Calculator (SUVAT + Projectile)
Solve any SUVAT equation or projectile problem — pick the unknown and get full working.
Delaware Minimum Wage Calculator
Compute gross weekly, monthly and annual pay at Delaware's $15.00/hr minimum wage with overtime.
Activation Energy Calculator
Arrhenius equation, two-point Eₐ, first-order half-life and Eyring–Polanyi in one tool.
Boiling Point Elevation Calculator
Calculate ΔTb = i · Kb · m — solve for elevation, Kb, molality or Van't Hoff factor.
Elevation Grade Calculator
Convert between slope grade %, angle, rise, run and slope distance instantly.
Medical & Clinical
Blood Alcohol Content (BAC) Calculator
Estimate your BAC with the Widmark formula — never use it to decide to drive.
Metabolic Age Calculator
Estimate your metabolic age from your BMR.
Anion Gap Calculator
Instantly compute anion gap, albumin-corrected AG, delta ratio and osmolar gap.
APGAR Score Calculator
Assess a newborn's health at birth with the standard five-criterion APGAR scale.
Body Surface Area (BSA) Calculator
Calculate BSA using Mosteller, DuBois, Haycock and three more formulae — instantly in your browser.
Cat Years Calculator
Find out how old your cat is in human years — with life-stage guidance.
Corrected Calcium Calculator
Adjust serum calcium for low or high albumin using the Payne formula.
Creatinine Clearance Calculator (Cockcroft-Gault)
Estimate kidney function for drug dosing using the Cockcroft-Gault equation.
eGFR Calculator (CKD-EPI 2021)
Estimate kidney function from serum creatinine using the latest race-free equation.
Gestational Age Calculator
Find out exactly how far along you are — in weeks and days.
eGFR Calculator (CKD-EPI 2021)
Estimate kidney function using the latest race-free CKD-EPI 2021 equation.
MAP Calculator (Mean Arterial Pressure)
Instantly compute Mean Arterial Pressure from systolic and diastolic readings.
Mean Arterial Pressure (MAP) Calculator
Instantly compute MAP from systolic and diastolic blood pressure readings.
Pet Age Calculator
Convert your pet's age to a human-equivalent age using real veterinary science.
QTc Interval Calculator
Correct the QT interval for heart rate using Bazett, Fridericia, Framingham and Hodges formulas.
Dog Years Calculator
Convert your dog's age to human years with size-aware milestones and life-stage analysis.
Caffeine Half-Life Calculator
See exactly how much caffeine is still in your system and when you can safely sleep.
Glycemic Load Calculator
Calculate the glycemic load of any meal from a database of 60+ foods.
Sugar Intake Calculator
Track your daily sugar consumption against WHO, AHA and NHS limits.
Fiber Intake Calculator
Find your daily fiber target and track it food by food.
Sodium Intake Calculator
Track your daily sodium and salt intake against WHO, AHA and NHS limits.
Standard Drink Calculator
Convert any drink into standard units for US, UK, Australia and Canada.
Health & Fitness
BMI / BMR / TDEE Calculator
Body mass index, basal metabolic rate and daily calorie needs in one tool.
Pregnancy Due Date Calculator
Estimated due date, gestational age and trimester from your last period.
BMR Calculator
Your Basal Metabolic Rate with the Mifflin-St Jeor equation.
TDEE Calculator
Total Daily Energy Expenditure from BMR and activity level.
Body Fat Calculator
Estimate body fat percentage with the US Navy method.
Ideal Weight Calculator
Ideal body weight from four classic formulas.
Lean Body Mass Calculator
Lean mass and fat mass from the Boer formula.
Calorie Deficit Calculator
Find your daily calorie target for steady, safe weight loss.
Macro Calculator
Split your daily calories into protein, carbs and fat in grams.
Water Intake Calculator
Estimate how much water to drink each day for your body and activity.
Running Pace Calculator
Work out pace, finish time or distance for any run.
One Rep Max Calculator
Estimate your 1RM and training weights from a set you can do.
Sleep Cycle Calculator
Find the best bedtime or wake-up time around 90-minute cycles.
Joules to Calories Converter
Convert J to cal instantly — 1 cal = 4.184 J. Free, browser-only tool.
Pregnancy Week Tracker
See how many weeks pregnant you are, your trimester and your due date.
Calorie Burn by Activity Calculator
Estimate calories burned for any activity using MET values.
BMI Prime Calculator
Express your BMI as a ratio to the healthy-weight ceiling of 25.
Waist-to-Height Ratio Calculator
Check if your waist is less than half your height — a simple health screen.
VO2 Max Calculator
Estimate your VO2 max from resting HR, a Cooper run or a Rockport walk.
Waist-to-Hip Ratio Calculator
Divide waist by hip and see your WHO health-risk band.
Protein Intake Calculator
How much protein per day for maintenance, muscle gain or fat loss.
Max Heart Rate Calculator
Your maximum heart rate plus five training zones, with Karvonen support.
Running Pace Converter
Convert between min/km, min/mile, km/h and mph instantly.
Pregnancy Weight Gain Calculator
Check your pregnancy weight gain against IOM guidelines by week.
Calories In vs Out Calculator
See your daily calorie balance and projected weight change.
Joules to Food Calories Converter
Convert joules to nutrition-label Calories (kcal) and back.
Calories to Joules Converter
Convert small (gram) calories to joules and back, exactly.
Target Heart Rate Zone Calculator
Training zones by Karvonen or percentage of max HR.
Calories Per Meal Planner
Split your daily calorie target across meals.
Steps to Calories Calculator
Convert your step count into calories burned.
Pregnancy Trimester Calculator
Find your trimesters, due date and gestational age.
BMI-for-Age Percentile Calculator
Child & teen BMI percentile using CDC growth charts.
Marathon Time Predictor
Predict your marathon finish from a recent race using the Riegel formula.
VDOT Running Calculator
Find your VDOT fitness score from any race time (Daniels–Gilbert model).
Swim Pace Calculator
Work out your pace per 100 m or 100 yd and average swim speed.
Calories to Kilojoules Converter
Convert food calories (kcal) to kilojoules, both directions.
Kilojoules to Calories Converter
Convert kilojoules to food calories (kcal), both directions.
Heart Rate Recovery Calculator
How fast your pulse drops after exercise.
Pace Per Kilometer Calculator
Turn distance and time into min/km, min/mile and km/h.
Daily Calorie Cycling Calculator
Split your weekly calories into high and low days.
Hydration Reminder Calculator
Your daily water target and a drink-every-X-minutes schedule.
Workout Program Builder
Build a weekly training split, track sets and reps, and export a printable PDF.
Macro Meal Planner
Plan a day of meals, hit your protein, carb and fat targets, export the plan.
Workout Log
Track sets, reps and weight per session — with history and personal-best highlights.
BMR & TDEE Calculator
Find your BMR, daily calorie burn and goal calorie targets in seconds.
Calorie & Macro Daily Tracker
Log foods against calorie and macro targets with live progress rings.
Body Fat Calculator (US Navy Method)
Estimate body fat % from a tape measure using the US Navy formula.
Sleep Cycle Calculator Pro
Bedtime, wake-up and nap times tuned to your own 90-minute cycles.
Heart Rate Zone Calculator
Turn your age and resting pulse into five training zones with exact BPM ranges.
One Rep Max Calculator (Pro)
Estimate your 1RM from seven formulas, with a full training-percentage table in kg and lb.
Water Intake Calculator (Advanced)
Personalised daily water target from weight, age, activity and climate.
BMI Calculator with Healthy Weight Range
Body mass index, your category, and the healthy weight range for your height.
Running Pace Calculator Pro: Pace, Time, Distance + Splits
Enter any two of pace, time and distance — get the third, plus splits and race predictions.
Sourdough Hydration & Baker's Percentage Calculator
Find your dough hydration and every baker's % in one click.
Pace Per Mile Calculator
Find your pace, finish time or distance — in minutes per mile.
Rowing Split Calculator
Convert your split to watts, calories and total time — or find the split you need to hit a goal time.
Steps to Miles Calculator
Convert any step count to miles and kilometres instantly.
Calories Burned Cycling Calculator
Find out exactly how many calories you burn on every ride.
Calories Burned Swimming Calculator
Find out exactly how many calories you burn for every stroke and session.
FFMI Calculator
Calculate your Fat-Free Mass Index and see how your muscularity compares.
Heart Rate Reserve Calculator
Find your true Karvonen training zones using the HRR method.
Marathon Pace Predictor
Goal time, training zones, negative splits and 5-km split cards — all from one number.
Plate Loading Calculator
Instantly know which plates to load on each side of the bar — kg and lb.
Running Cadence Calculator
Find your ideal steps per minute from speed and stride length.
Steps to Calories Calculator
Convert any step count to calories burned — with distance, pace, fat burned, and daily projections.
Wilks Calculator
Compare your powerlifting total across any bodyweight class.
Calories Burned Running Calculator
Find out exactly how many calories your run burns — by speed, weight and distance or time.
DPI / Dots Calculator
Calculate PPI for screens and DPI for print — find the right resolution in seconds.
Beep Test Calculator
Find your VO2 max and fitness rating from your 20m shuttle run level and shuttle.
Brzycki 1RM Calculator
Estimate your one-rep max from any rep-weight set using the Brzycki formula.
Cooper Test Calculator
Estimate VO2max from your 12-minute run — with age and sex fitness norms.
Epley 1RM Calculator
Estimate your one-rep max from any submaximal lift in seconds.
Treadmill Pace Converter
Convert treadmill speed to running pace, finish times and calorie burn instantly.
Calorie Cycling Calculator
Plan high, medium, low and rest-day calories around your training week.
RPE Load Calculator
Translate Rate of Perceived Exertion to exact training loads using the Tuchscherer RTS chart.
Waist-to-Height Ratio Calculator
Check your central obesity risk with the simple keep-your-waist-to-half-your-height rule.
Waist-to-Hip Ratio Calculator
Calculate your WHR, see your WHO risk band, and solve for the waist size you need.
Wendler 5/3/1 Calculator
Generate your full 4-week 5/3/1 cycle — sets, weights, AMRAP targets and progression.
Grade Adjusted Pace Calculator (GAP)
Find your flat-equivalent running pace on any hill using the Minetti metabolic model.
Reverse Diet Calculator
Ramp calories back to maintenance with minimal fat gain.
Running Economy Calculator
Calculate your oxygen cost per km, energy cost (Cr) and running efficiency from a sub-maximal VO2 test.
TDEE Calculator — Katch–McArdle & Cunningham
The most accurate lean-mass TDEE: Katch–McArdle + Cunningham, with solve-for-body-fat mode.
Pregnancy Due Date Calculator
Find your estimated due date using LMP, conception, IVF transfer, or ultrasound dating.
Ovulation Calculator
Find your fertile window and estimated ovulation date for the next 1–6 cycles.
Pregnancy Week Calculator
Find out exactly which week of pregnancy you are in and see what comes next.
Running Pace to Speed Converter (Tempo to mph / km/h)
Convert any running pace to mph, km/h and m/s — plus instant race finish times.
Army Body Fat Calculator
Estimate body fat with the official U.S. Army AR 600-9 circumference formula and check your Army standard.
Fat-Burning Zone Calculator
Find the exact heart-rate range where your body burns the most fat per minute.
Hydration During Exercise Calculator
Know exactly how much to drink before, during and after your workout.
Protein Per Meal Calculator
Find out exactly how much protein to eat at each meal for your body weight and goal.
Heart Rate Zone Calculator
Find your 5 training zones using Karvonen or % Max HR.
Target Heart Rate Calculator
Find your ideal training heart-rate zone for any fitness goal.
VO2max From Race Time Calculator
Derive your VDOT and five training pace zones from any recent race result.
Calories in Recipe Calculator
Total calories, macros and per-serving breakdown for any home-cooked dish.
Chemistry
Miles per Hour to Kilometres per Hour Converter
Convert mph to km/h instantly — 1 mph = 1.609344 km/h. Free, browser-only tool.
Miles per Hour to Knots Converter
Convert mph to kn instantly — 1 mph = 0.868976 kn. Free, browser-only tool.
Percent Yield Calculator
Percent yield from actual and theoretical yield — or solve either.
Ideal Gas Law Calculator
Solve PV = nRT for pressure, volume, moles or temperature — with units and steps.
Molarity Calculator
Solve for molarity, moles, mass or volume — with grams to moles built in.
pH Calculator
Convert between pH, pOH, [H⁺] and [OH⁻], and get pH from strong acid or base concentration.
Dilution Calculator (C1V1 = C2V2)
Solve the dilution equation for any concentration or volume, with units.
Molar Mass Calculator
Molar mass of any chemical formula, with per-element breakdown.
Cocktail Dilution Calculator
Know exactly how much ice water enters your drink — and where your ABV lands.
Titration Calculator
Find analyte concentration, titrant volume or equivalence point from any three knowns.
Ideal Gas Law Calculator (PV = nRT)
Solve for pressure, volume, moles or temperature — with full unit conversion.
Combined Gas Law Calculator
Solve P₁V₁/T₁ = P₂V₂/T₂ — plus Boyle, Charles, Gay-Lussac and the Ideal Gas Law.
Empirical Formula Calculator
Find the empirical and molecular formula from mass percentages or masses.
Enthalpy Calculator
Hess's Law, Gibbs ΔG, bond enthalpies, Kirchhoff, calorimetry — all in one tool.
Entropy & Gibbs Free Energy Calculator
Calculate ΔS, ΔG, Boltzmann entropy and more — six thermodynamic laws in one tool.
Equilibrium Constant Calculator
Kc, ICE tables, van't Hoff and Q vs Kc — all in one tool.
Gibbs Free Energy Calculator
Calculate ΔG, ΔH, ΔS, equilibrium constants and Nernst cell potentials instantly.
Molality Calculator
Calculate molality, solute mass, solvent mass, or molar mass — with full working shown.
pH and pOH Calculator
Convert between pH, pOH, and ion concentrations — with Henderson–Hasselbalch, buffer capacity, and dilution.
PPM Calculator
Convert ppm to molarity, run Beer-Lambert, dilute to a target concentration — all in one place.
Rate of Reaction Calculator
Arrhenius, rate laws, half-lives, activation energy — six chemistry modes in one tool.
Stoichiometry Calculator
Molar mass, limiting reagent, percent yield, molarity and ideal gas law — all in one place.
Atom Economy Calculator
Atom economy, E-factor, PMI, RME and mass balance — green chemistry metrics in one tool.
Beer-Lambert Law Calculator
Solve for absorbance, concentration, molar absorptivity, or path length instantly.
Boyle's Law Calculator
Solve P₁V₁ = P₂V₂ instantly — find any missing pressure or volume.
Charles's Law Calculator
Solve V1/T1 = V2/T2 instantly — find any gas volume or temperature at constant pressure.
Dalton's Law of Partial Pressures Calculator
Compute total pressure, partial pressures and mole fractions for any gas mixture.
Freezing-Point Depression Calculator
Calculate ΔTf, molality, Kf, or the van t Hoff factor — with full step-by-step working.
Gay-Lussac's Law Calculator
Solve P1/T1 = P2/T2 instantly — pressure, temperature, or both.
Graham's Law of Effusion Calculator
Compare gas effusion rates using r₁/r₂ = √(M₂/M₁). Solve for rate ratio, individual rate, or unknown molar mass.
Henderson-Hasselbalch Calculator
Solve pH, pKa, [A⁻] or [HA] with full step-by-step working.
Limiting Reagent Calculator
Find the limiting reagent, theoretical yield, excess amounts and percent yield instantly.
Mole Fraction Calculator
Find mole fractions, mole percentages and partial pressures for any gas or liquid mixture.
Normality Calculator
Calculate normality, equivalent weight, molarity conversions, dilutions and titration endpoints.
Osmotic Pressure Calculator (van 't Hoff: π = iMRT)
Solve for osmotic pressure, concentration, temperature or the van 't Hoff factor — with full unit support.
Theoretical Yield Calculator
Find theoretical yield, percent yield, or actual yield — with full stoichiometric working.
Nernst Equation Calculator
Calculate cell potential, standard E°, electrons transferred, reaction quotient or temperature — with full step-by-step working.
Percent Composition Calculator
Find the mass percent of every element in any chemical formula instantly.
Scoville Dilution Calculator
Calculate how much diluent to add to hit your target heat level.
Physics
Momentum Calculator
Momentum p = m × v and impulse J = F × t, instantly.
Gravitational Force Calculator
Newton's law of gravitation: F = G·m₁·m₂ / r².
Newtons to Pounds-force Converter
Convert newtons to pounds-force instantly — 1 lbf = 4.4482216 N. Free, browser-only.
Escape Velocity Calculator
Work out the speed needed to escape any body's gravity.
Orbital Period Calculator
Compute how long one orbit takes with Kepler's third law.
Celsius to Newton Scale Converter
Convert °C to the historic Newton temperature scale, both ways.
Kinetic Energy Calculator
Solve KE = ½ m v² for energy, mass, or velocity — with full working shown.
Projectile Motion Calculator
Launch speed and angle to range, max height, flight time — with trajectory chart.
Power-to-Weight Ratio Calculator
Compare two vehicles' power-to-weight ratios in W/kg, kW/t and hp/t.
Doppler Shift Calculator
Calculate observed frequency, redshift and wavelength change for sound or light.
Lens Equation Calculator
Solve the thin lens equation for f, do or di — plus magnification, optical power and a live ray diagram.
Pressure at Depth Calculator
Calculate hydrostatic pressure at any depth — gauge and absolute, any fluid.
Reynolds Number Calculator
Predict laminar, transitional or turbulent flow — solve for Re, velocity, length or viscosity.
Terminal Velocity Calculator
Calculate the terminal velocity of any falling object using real aerodynamics.
Buoyancy Calculator
Compute buoyant force, fluid density, or submerged volume using Archimedes' principle.
Gas Density Calculator
Calculate gas density from pressure, temperature and molar mass — or solve for P or T.
Pendulum Period Calculator
Calculate period, length or gravity for a simple pendulum using T = 2π√(L/g).
Snell's Law Calculator
Compute refracted angle, incident angle, or refractive index — with critical-angle and Fresnel reflectance.
Specific Heat Calculator
Calculate heat energy, mass, specific heat capacity or temperature change using Q = m·c·ΔT.
Spring Constant Calculator
Hooke's Law — solve for k, force, or displacement with elastic PE and natural frequency.
Thermal Expansion Calculator
Calculate linear, area and volumetric expansion for 30 materials using ΔL = α · L₀ · ΔT
Angular Velocity Calculator
Calculate angular velocity, centripetal acceleration, tangential speed and more — with unit conversions.
Free Fall Calculator
Solve distance, time, velocity or g for any free-fall problem — Earth, Moon, Mars and beyond.
Friction Calculator
Compute friction forces, normal forces, slip angles and incline acceleration — with full working shown.
Power Physics Calculator
Solve P = W/t, P = Fv, P = τω, P = VI, P = I²R, hydraulic, rotational KE and more — with full working shown.
Banking Angle Calculator
Find the ideal banking angle, speed, or curve radius for any banked turn.
Coulomb's Law Calculator
Calculate electrostatic force between two point charges — solve for F, q₁, q₂, or r.
de Broglie Wavelength Calculator
Calculate the quantum wavelength of any moving particle — electrons, protons, neutrons, or custom masses.
Frequency and Period Calculator
Instantly convert between frequency f, period T, and angular frequency omega — with unit-aware results across Hz to THz.
Gravitational Force Calculator
Newton's universal gravitation: F = G * m1 * m2 / r2. Solve for any variable.
Impulse Calculator
Solve J = F·Δt or J = m·v_f − m·v_i with step-by-step working.
Kinetic Friction Calculator
Calculate friction force, stopping distance, incline dynamics and work done by friction.
Moment of Inertia Calculator
Compute I for 11 shapes, solve rotational KE and angular momentum — with the parallel axis theorem built in.
Newton's Second Law Calculator
F = ma — solve for force, mass, acceleration plus impulse, work, friction, circular motion, and inclined planes.
Orbital Velocity Calculator
Find the speed needed for a circular orbit around any body — with escape velocity, period and geostationary orbit.
Torque Physics Calculator
Solve torque, angular acceleration, rotational power, work, and lever balance — with full working shown.
Work & Energy Calculator
Solve work, KE, PE, power, momentum, impulse, collisions and centripetal force — with full working shown.
Centripetal Force Calculator
Solve F = m·v²/r instantly — force, mass, velocity, or radius.
Gravitational Potential Energy Calculator
Calculate PE = mgh instantly — solve for energy, mass, height, or g.
Hooke's Law Calculator
Solve F=kx, elastic PE, series/parallel springs and SHM oscillation — with full working.
Projectile Range Calculator
R = v₀²·sin(2θ)/g — range, height, flight time, impact speed.
Wave Speed Calculator
v = f × λ — solve for wave speed, frequency, wavelength, or period.
Electronics
Resistor Color Code Calculator
Decode 4-band resistor colour bands to ohms.
Decibel (dB) Calculator
Convert a power or amplitude ratio to decibels.
Ohm's Law Calculator
Enter any two of V, I, R or P — get the other two with the formula wheel.
Resistor Color Code Calculator
Decode 4, 5 and 6-band resistors — or work backwards from a value to the colours.
Capacitor Code Calculator
3-digit EIA code to capacitance — and back. With tolerance band and voltage rating.
LED Resistor Calculator
Series resistor, nearest E12/E24 value and power rating — instantly.
Voltage Divider Calculator
Solve for Vout, Vin, R1 or R2 — with current, power and full working.
Battery Life Calculator
Capacity, load and efficiency → exact runtime hours, minutes and a discharge curve.
Wire Gauge (AWG) Calculator
AWG to diameter, ampacity with derating, and voltage drop for any run length.
555 Timer Calculator
Astable frequency, duty cycle and monostable pulse width — with full working.
LC Resonant Frequency Calculator
Find the resonant frequency, inductance, or capacitance of any LC tank circuit instantly.
Op-Amp Gain Calculator
Instantly calculate voltage gain, bandwidth and resistor values for any op-amp configuration.
PC Power Supply Calculator
Find the right PSU wattage for your build — CPU, GPU, storage and all.
Voltage Drop Calculator
Calculate voltage drop for any cable run — or find the minimum wire size for a target drop limit.
Antenna Length Calculator
Calculate the exact physical length for any antenna type from frequency — or find the resonant frequency from a known length.
Battery Runtime Calculator
Peukert-corrected runtime, required capacity, and max load for any battery pack.
Capacitor Charge Calculator
Calculate charge, voltage, capacitance, energy stored and dynamic charge/discharge voltage in an RC circuit.
Capacitor Parallel & Series Calculator
Instantly find the total capacitance of any combination of capacitors in parallel or series.
Decibel Distance Calculator
How loud is a sound at a different distance? Instant inverse-square-law answer.
Generator Sizing Calculator
Calculate the exact kVA rating you need — with motor surge, altitude and temperature derating.
RC Time Constant Calculator
Calculate τ = R × C, cutoff frequency, and capacitor voltage at any time.
Resistor Parallel Calculator
Equivalent resistance, conductance breakdown and solve-for-missing-R — all in one tool.
Transformer Turns Ratio Calculator
Compute secondary voltage, current, reflected impedance and winding counts for any transformer.
UPS Runtime Calculator
How long will your UPS last? Peukert-corrected battery runtime with real efficiency losses.
Resistor Series Calculator
Total resistance, current, voltage drops and power for any series resistor network.
Solar Battery Bank Calculator
Size a solar battery bank with the correct Ah formula — autonomy, DoD, efficiency, cell config.
Dipole Antenna Calculator
Instantly calculate half-wave dipole, quarter-wave monopole, and full-wave loop lengths for any frequency.
Capacitance Calculator
Parallel-plate, charge-voltage, energy stored, RC time constant, series and parallel combinations — all in one tool.
Inductance Calculator
Calculate inductance, reactance, energy, RL time constant and series/parallel combinations.
Resistivity Calculator
Calculate wire resistance, resistivity, length or cross-sectional area — with temperature correction.
Magnetic Force Calculator
Calculate Lorentz force on a charge, on a wire, or between two parallel wires — solve for any variable.
Decibel to Watt Calculator
Convert dB levels to watts (and watts to dB) with full working shown.
ADC Resolution Calculator
Compute LSB voltage, SNR, ENOB, quantisation noise and dynamic range for any ADC.
Amps to Watts Calculator
Convert amps to watts (or watts to amps) for DC, AC single-phase and AC three-phase circuits.
Capacitor Energy Calculator
Calculate the energy stored in a capacitor — plus series/parallel networks and RC discharge power.
Frequency to RPM Calculator
Convert Hz, kHz, rad/s and RPS to RPM — and back — instantly.
kVA to kW Calculator
Convert apparent power to real power instantly — single-phase and three-phase.
kW to kVA Calculator
Convert real power (kW) to apparent power (kVA) using power factor.
Power Dissipation Calculator
Calculate real, apparent and reactive power for DC circuits, AC single-phase and three-phase systems, plus junction temperature from thermal resistance.
Three-Phase Power Calculator
Calculate kW, kVA, kVAR, current and voltage for balanced three-phase AC systems.
Voltage Divider Output Calculator
Compute loaded and unloaded Vout, loading error, power, and nearest E-series resistor.
Watts to Amps Calculator
Convert watts to amps for DC, single-phase AC, and three-phase AC circuits.
Wire Resistance Calculator
Calculate conductor resistance, voltage drop and power loss for any material, length and cross-section.
Conduit Fill Calculator
Check NEC conduit fill compliance — pick a conduit, add wires, get the fill percentage instantly.
Motor FLA Calculator
Calculate full load amperes for single-phase and three-phase AC motors.
PWM Duty Cycle Calculator
Instantly compute duty cycle, frequency, t-on, t-off, period, average voltage, RMS voltage, and power for any PWM signal.
Automotive
FIRE Retirement Calculator
Find your FIRE number and how long until you reach it.
Horsepower to Watts Converter
Convert mechanical horsepower to watts and back, instantly.
Retirement & FIRE Planner
Project your portfolio to retirement, find your FIRE number, and see if it lasts.
Retirement Countdown
Live countdown to the day you reach your target retirement age.
RC Gear Ratio Calculator
Calculate pinion, spur and top speed for your RC car build.
Ackermann Angle Calculator
Calculate ideal inner and outer steer angles, turning radius and Ackermann percentage for any vehicle geometry.
Air-Fuel Ratio Calculator
Calculate AFR, lambda, and equivalence ratio for any fuel — gasoline, diesel, ethanol, methanol, hydrogen and more.
Brake Horsepower Calculator
Calculate BHP from torque and RPM, a Prony brake, or BMEP — with full step-by-step working.
Compression Ratio Calculator
Calculate engine compression ratio — or solve for bore, stroke, or clearance volume.
Engine CC to HP Calculator
Convert engine displacement to horsepower using four engineering methods.
Engine Displacement Calculator
Calculate engine displacement, bore, stroke or cylinder count from any three variables.
Final Drive Ratio Calculator
Solve ring/pinion ratios, vehicle speed, engine RPM and tyre size in one tool.
Fuel Injector Size Calculator
Find the right injector size for your target horsepower in seconds.
Horsepower to Torque Calculator
Convert between horsepower, torque and RPM with full step-by-step working.
Intercooler Calculator
Calculate charge-air temperature drop, pressure loss, density gain and estimated power increase from your intercooler.
Quarter-Mile Calculator
Predict your drag-strip ET and trap speed from horsepower and weight.
Tire Diameter Calculator
Find overall diameter, sidewall, circumference and revs/mile — plus speedometer correction when swapping sizes.
Tire Size Calculator
Decode any P-metric tire code and compare two sizes in seconds.
Turbo Size Calculator
Find the right turbocharger for your engine — compressor flow, pressure ratio, inducer size and shaft speed.
Wheel Offset Calculator
Calculate backspacing, lip clearance and track change from ET offset.
0-60 mph Estimator
Estimate your car''s 0–60 mph time from weight and horsepower.
Boost Pressure Calculator
Convert boost gauge readings, solve pressure ratio, model charge-air density and check injector duty cycle — all in your browser.
Gear Ratio & Speed Calculator
Work out vehicle speed, RPM, gear ratios and final drive from tyre size and transmission data.
Speedometer Error Calculator
Find out how inaccurate your speedo really is — and what your true speed is.
Volumetric Efficiency Calculator
Measure how well your engine breathes — four methods, instant results.
Music & Audio
BPM to Milliseconds Calculator
Turn any tempo into delay and note-length times in milliseconds.
Note Frequency Calculator
Find the exact frequency in Hz for any musical note and octave.
Speaker Box Volume Calculator
Design sealed and ported enclosures using Thiele-Small parameters.
Speaker Impedance Calculator
Calculate total impedance for series, parallel and mixed speaker wiring in seconds.
Subwoofer Port Length Calculator
Calculate the exact port tube length to hit your target bass tuning frequency.
BPM to Milliseconds Calculator
Convert any tempo to exact delay, echo and reverb times — straight, dotted and triplet.
Capo Transpose Calculator
Find the right capo fret and open chord shape for any key — instantly.
Cents to Frequency Calculator
Convert pitch intervals in cents to exact frequencies — and back.
Chord Finder
Build any chord by root and type, or identify a chord from its notes — with audio playback.
Guitar String Tension Calculator
Find the exact tension on every string — or the right gauge for a target feel.
Key Transpose Calculator
Transpose any song to a new key instantly — diatonic chords, scale notes and full chord charts.
Semitone Interval Calculator
Pick any two notes and instantly see the semitone distance, cents, frequency ratio and interval name.
Time Signature Calculator
Beat durations, bar lengths, compound vs simple meters, polyrhythm grids and tap tempo — all in one tool.
BPM Delay Calculator
Convert BPM to delay times, reverse-engineer tempo from a known delay, tap-detect tempo and model feedback decay — all in one tool.
Metronome & BPM Tapper
Tap the beat, measure your tempo, and hear a precise click-track with note-delay tables.
Scale Degree Calculator
Instantly see every note, Roman numeral and interval in any musical scale.
Gaming
Italy Codice Fiscale Decoder & Validator
Decode an Italian Codice Fiscale — date of birth, gender and check digit.
Dice Notation Roller
Roll full RPG dice notation: 3d6+2, 2d20kh1, 4d6dl1, exploding dice and more.
D&D Ability Score Calculator
Roll, buy, or array-assign your D&D 5e stats with modifiers, saving throws and XP thresholds.
Character Level Calculator
Instantly find your RPG character level from XP — D&D 5e, Pathfinder 2e and OSE.
Damage Per Second (DPS) Calculator
Calculate true DPS for any weapon, build or ability rotation in any game.
D&D 5e Encounter XP Calculator
Balance encounters by difficulty — Easy, Medium, Hard or Deadly.
D&D Spell Slot Tracker
Track every spell slot for every D&D 5e caster class in real time.
Experience Points (XP) Calculator
Build D&D 5e encounters, look up level-up thresholds and track character XP — all in one tool.
Loot Roll Generator
Simulate RPG loot tables with weighted drops, rarity tiers, and dice quantities.
MTG Life Counter
Track life totals, poison counters, commander damage and more for Magic - The Gathering.
D&D Critical Hit Calculator
Instantly see crit damage range, average, and full probability distribution.
Dice Probability Calculator
Exact probabilities for any dice roll — 2d6, 3d10, custom polyhedral dice.
Astronomy
Moon Phase Calculator
Find the moon phase and illumination for any date.
Astronomical Unit Converter
Convert astronomical units (AU) to kilometers and back.
Light-Years to Kilometers Converter
Convert light-years to kilometers and back.
Parsecs to Light-Years Converter
Convert parsecs to light-years and back.
Planet Weight Calculator
See how much you would weigh on every planet, the Moon and the Sun.
Telescope Magnification Calculator
Find your telescope magnification from focal length and eyepiece.
Sunrise & Sunset Calculator
Find exact sunrise, solar noon, and sunset times for any location and date.
Golden Hour Calculator
Find the exact golden hour and blue hour windows for any location and date.
Blue Hour Calculator
Find exact blue hour, golden hour and twilight times for any location and date.
Next Full Moon Calculator
Find the exact date and time of the next full moon — and the ones after it.
Sunrise & Sunset Time Calculator
Find exact sunrise, sunset, solar noon and golden hour for any location and date — no internet needed.
Telescope Magnification Calculator
Magnification, exit pupil, true FOV, limiting magnitude and resolving power — all in one tool.
Angular Resolution Calculator
Rayleigh criterion, Dawes limit, Abbe limit, pixel scale and more — all in your browser.
Day Length Calculator
Sunrise, sunset, golden hour and day length for any location and date — no internet required.
Focal Ratio Calculator (f-number / f-stop)
Calculate f-number, focal length, aperture diameter, depth of field and exposure equivalents.
Light-Year Distance Calculator
Convert cosmic distances between light-years, parsecs, AU, km and more — with light travel time.
Moon Phase Tonight
See the current moon phase, illumination, distance and next phase dates — instantly.
Redshift Calculator
Compute cosmological distances, lookback time and recession velocity from redshift z.
Solar Noon Calculator
Find the exact moment the sun peaks in the sky — plus sunrise, sunset and golden hour.
Star Magnitude Calculator
Compare star brightness, find absolute magnitude, and compute telescope limits.
Geography & GPS
3D Distance Calculator
Find the straight-line distance between two points in three-dimensional space.
Haversine Distance Calculator
Calculate the great-circle distance between any two points on Earth.
Latitude & Longitude Converter
Convert coordinates between DD, DDM, DMS, radians and UTM — plus great-circle distance and bearing.
Bearing Calculator
Find the compass bearing and great-circle distance between any two points on Earth.
Compass Bearing Calculator
Find the true bearing and great-circle distance between any two points on Earth.
Coordinate Distance Calculator
Great-circle distance, bearing and midpoint between two GPS coordinates.
GPS Coordinate Formatter
Convert GPS coordinates between DD, DDM, DMS, UTM, Geohash, Plus Code, Maidenhead and MGRS instantly.
Great-Circle Distance Calculator
Compute the shortest path between any two points on Earth — with bearings, midpoint, and Vincenty precision.
Map Scale Calculator
Convert map distances to real-world distances — and find any unknown in the scale equation.
UTM Coordinate Converter
Convert between UTM grid references and latitude/longitude in both directions.
Statistics & Probability
Combinations & Permutations Calculator
Compute nCr, nPr, and factorials instantly in your browser.
Z-Score Calculator
Convert a value to a standard score — and back.
Confidence Interval Calculator
Mean ± margin of error at 80–99% confidence.
Correlation Calculator
Pearson r for two paired data series.
Probability Calculator
Complement, AND/OR for independent events, and Bayes.
Sample Size Calculator
How many responses you need for a survey.
Statistics Calculator
Paste numbers and get mean, median, mode, range, variance, standard deviation, quartiles and sum instantly.
Standard Deviation Calculator
Sample and population standard deviation with a full step-by-step working table.
Permutation and Combination Calculator
Compute nPr and nCr with a full factorial breakdown and exact big-number math.
Expected Value Calculator
Calculate E[X] for discrete, Bernoulli, uniform and normal distributions — with full working shown.
Kelly Criterion Calculator
Find the mathematically optimal bet size to maximise long-run bankroll growth.
Linear Regression Calculator
Fit a least-squares line, get R², ANOVA table, residuals and predictions instantly.
P-Value Calculator
Instantly compute exact p-values for Z, t, and chi-squared tests — with formula working shown.
Poisson Distribution Calculator
Calculate exact, cumulative and range probabilities for any Poisson process.
Binomial Probability Calculator
Exact P(X = k), cumulative CDF and full distribution — with a bar chart.
Combinations with Repetition Calculator
Count multiset selections using the stars-and-bars formula.
Correlation Coefficient Calculator
Calculate Pearson r, R², regression line and scatter plot instantly.
Z-Score to Percentile Calculator
Convert any z-score to a percentile — or find the z-score for any percentile.
Birthday Paradox Calculator
Discover how quickly shared birthdays become probable in a group.
Geometry
Circle Calculator
Radius, diameter, circumference and area from any one value.
Triangle Calculator
Area, perimeter and angles from three side lengths.
Pythagorean Theorem Calculator
Solve a² + b² = c² for the hypotenuse or a missing leg.
Body Surface Area Calculator
BSA in m² by Du Bois, Mosteller and Haycock formulas.
Sphere Calculator
Volume and surface area of a sphere from its radius.
Cone Calculator
Volume, surface area and slant height of a right circular cone.
Cylinder Calculator
Volume and surface area of a right circular cylinder.
Pyramid Calculator
Volume and surface area of a rectangular-base pyramid.
Trapezoid Calculator
Area, perimeter and midsegment of a trapezoid.
Ellipse Calculator
Area, perimeter, eccentricity and axes of an ellipse.
Polygon Area Calculator
Area, perimeter and angles of any regular polygon.
Hexagon Calculator
Area, perimeter, diagonals and apothem of a regular hexagon.
Sector & Arc Calculator
Arc length, sector area and chord from radius and angle.
Parallelogram Calculator
Area, height, perimeter and diagonals of a parallelogram.
Right Triangle Trig Solver
Solve any right triangle from two known values — sides and angles.
Law of Cosines Calculator
Solve any triangle from three sides or two sides and an angle.
Pentagon Calculator
Area, perimeter, diagonal and radii of a regular pentagon.
Octagon Calculator
Area, perimeter, diagonals and radii of a regular octagon.
Rhombus Calculator
Area, perimeter, diagonals and angles of a rhombus.
Regular Polygon Calculator
Area, perimeter, radii and angles for any regular n-gon.
Annulus Calculator
Area, width and circumferences of a ring between two circles.
Ramp Slope Calculator
Angle, percent grade, rise/run ratio and ADA compliance — instantly.
Rise Over Run Calculator
Slope, angle, grade and pitch from any rise and run — or solve in reverse.
Cube Volume Calculator
Instantly find the volume, surface area and diagonals of any cube — solve from any known value.
Ellipsoid Volume Calculator
Compute volume, surface area and solve for any semi-axis — all in your browser.
Equilateral Triangle Calculator
Instantly find side, height, area, perimeter, inradius and circumradius — solve from any one value.
Pyramid Volume Calculator
Volume, surface area and slant height for any pyramid — square, rectangular, triangular or hexagonal base.
Rectangular Prism Volume Calculator
Instantly find volume, surface area and space diagonal — or solve for any missing dimension.
Right Triangle Calculator
Solve any right triangle from two known values — sides, angles, area and trig ratios instantly.
Slope-Intercept Calculator
Find the equation y = mx + b from two points, solve for x or y, and see the diagram.
Sphere Volume Calculator
Instantly find volume, surface area, diameter or radius — solve for any variable.
Triangle Area Calculator
Find the area of any triangle: base-height, Heron's formula, SAS, or coordinates.
Hexagon Area Calculator
Find the area of a regular hexagon from any measurement you have.
Circle Diameter Calculator
Find diameter, radius, circumference and area — solve from any one value.
Cone Volume Calculator
Calculate cone volume — or solve for radius or height from a known volume.
Rhombus Area Calculator
Find rhombus area from diagonals, side + height, or side + angle — with full working.
Torus Volume Calculator
Find volume, surface area and all torus dimensions — solve for any variable.
Trapezoid Area Calculator
Instantly find the area of any trapezoid — or solve for any missing dimension.
Triangle Angle Calculator
Find every angle and side of any triangle from three known values.
Annulus Area Calculator
Find the ring area, or solve for outer or inner radius from a known area.
Arc Length Calculator
Find arc length, radius or central angle — with working steps and a live diagram.
Capsule Volume Calculator
Calculate capsule volume — or solve for radius or cylinder height from a known volume.
Circle Area Calculator
Area, radius, diameter and circumference — solve for any one from any other.
Circle Equation Calculator
Find the standard form, general form, area, arc length, chord and sector — instantly.
Cylinder Volume Calculator
Find volume, surface area or a missing dimension of any cylinder instantly.
Ellipse Area Calculator
Compute ellipse area, perimeter, eccentricity — or solve for any missing semi-axis.
Frustum Volume Calculator
Find the volume of a truncated cone — or solve back for height or radius.
Hemisphere Volume Calculator
Calculate the volume, curved surface area and base area of any hemisphere instantly.
Heron's Formula Calculator
Find the area of any triangle from its three side lengths — no angles needed.
Law of Sines Calculator
Solve any triangle from two angles + one side, or two sides + an opposite angle.
Octagon Area Calculator
Area, perimeter, diagonals and radii of a regular octagon — solved from any measurement.
Parallelogram Area Calculator
Find the area of any parallelogram — or solve for base or height — instantly.
Regular Polygon Area Calculator
Area, perimeter, radii and angles for any regular n-gon — solve from side, radius or perimeter.
Sector Area Calculator
Area, arc length, chord and perimeter from any two of: radius, angle, or area.
Tetrahedron Volume Calculator
Calculate the volume of a regular tetrahedron — or find the edge length from a known volume.
Triangular Prism Volume Calculator
Find the volume (and surface area) of any triangular prism instantly.
Circle Circumference Calculator
Circumference from radius, diameter or area — solve any way around.
Pentagon Area Calculator
Area, perimeter, inradius, circumradius and diagonal — solve from any measurement.
Sphere Surface Area Calculator
Find the surface area of any sphere — or back-calculate the radius from a known area.
Diagonal of a Rectangle Calculator
Find the diagonal, width, height, angles, area and perimeter — with full step-by-step working.
Law of Cosines Solver
Solve any triangle from any three pieces — all five congruence cases with full step-by-step working.
Perimeter Calculator
Instantly find the perimeter of 14 shapes with step-by-step working.
Surface Area Calculator
Instant surface area for 10 shapes — sphere, cylinder, cone, prism, pyramid, torus and more.
Unit Circle Calculator
Enter any angle and instantly read sin, cos, tan, csc, sec, cot — with a live diagram.
Math & Algebra
Fraction to Decimal Converter
Turn any fraction — proper, improper or mixed — into a decimal.
Decimal to Fraction Converter
Convert any decimal into its simplest fraction or mixed number.
Mean, Median & Mode Calculator
Get the mean, median, mode, range and sum of any list of numbers.
Quadratic Formula Solver
Solve ax² + bx + c = 0 for real or complex roots.
Percentage Change Calculator
Work out the percentage increase or decrease between two values.
Business Days Calculator
Count working days between two dates, holidays excluded.
CGPA to Percentage Calculator
Convert CGPA to a percentage using CBSE, VTU, or a custom multiplier.
Romania CNP Decoder
Decode birth date, sex and county from a Romanian CNP.
Percentage of a Number Calculator
Quickly find what a percentage of any number is.
Tip Percentage Table
See the tip and total for a bill across every common tip percentage at once.
Percentage Increase / Decrease Calculator
Find the % change between two numbers, or apply a % rise or fall.
Proportion Solver (Cross-Multiplication)
Solve a/b = c/d for the missing value by cross-multiplication.
Exponent Calculator (Power Calculator)
Raise any base to any power — including negative and fractional exponents.
Logarithm Calculator (log, ln, log₂, any base)
Compute log base 10, natural log, log base 2 or any custom base.
Factorial Calculator (n!)
Compute exact factorials of any non-negative integer with BigInt.
Time Duration Adder
Add and subtract hours, minutes and seconds across a list of durations.
2x2 Matrix Calculator
Add, subtract, multiply, and find the determinant or inverse of 2x2 matrices.
Prime Factorization Calculator
Break any whole number down into its prime factors instantly.
Percentage of Total Calculator
Turn a list of values into each value's share of the total.
Cubic Meters to Liters Converter
Convert m³ to liters (and back) instantly.
Acceleration Calculator
a = (v_f − v_i) ÷ t — solve for acceleration, velocity, or time.
Percentile Calculator
Find any percentile of a data set — or a value's rank.
Degrees to Radians Converter
Convert degrees to radians instantly — rad = ° × π ÷ 180. Free, browser-only.
Radians to Degrees Converter
Convert radians to degrees instantly — ° = rad × 180 ÷ π. Free, browser-only.
Percentage Difference Calculator
Find the percentage difference between two values.
Weighted Average Calculator
Average values that carry different weights.
Rounding Calculator
Round numbers to decimals, multiples or whole numbers.
Add Business Days
Add or subtract business days from a date, skipping weekends.
2D Vector Calculator
Add, subtract, dot, cross and find the angle between 2D vectors.
Complex Number Calculator
Add, subtract, multiply and divide complex numbers with modulus and argument.
Set Operations Calculator
Union, intersection, difference and symmetric difference of two sets.
Modular Exponentiation Calculator
Compute (base ^ exponent) mod modulus for huge numbers.
Percentage to GPA Converter
Convert a percentage grade to a 4.0-scale GPA and letter.
Class Rank Percentile Calculator
Turn your class rank into a percentile and top-percent figure.
Attendance Percentage Calculator
Check your attendance percentage and absences left.
Debt-to-Income Ratio Calculator
See your DTI ratio and where you stand with lenders.
Decision Matrix Maker
Score options against weighted criteria and find the ranked winner.
Date Duration Calculator
Exact years, months, days and hours between two dates — plus add or subtract a duration.
Roman Numeral Math Calculator
Add, subtract, multiply and divide directly in Roman numerals — with a full step-by-step explanation.
Math Worksheet Generator
Build printable arithmetic worksheets with a matching answer key.
Aspect Ratio Crop & Letterbox Calculator
Convert any resolution to a new aspect ratio: crop, letterbox, area kept and storage cost.
Debt-to-Income Ratio Calculator
Add up your monthly debts and income to see your DTI and where it lands with lenders.
GCD & LCM Calculator
Find the greatest common divisor and least common multiple of any integers — with Euclid steps.
Ratio Calculator
Simplify ratios, solve proportions and scale ratios — with the working shown.
Fraction Calculator
Add, subtract, multiply and divide fractions with full working shown.
Percentage Calculator
One tool for every percentage question — of, is-what-%, change, difference, increase, decrease and reverse.
Prime Number Checker
Test any number for primality, factorise it, and list every prime up to N.
Scientific Notation Converter
Convert decimals to scientific, engineering and E-notation with significant figures.
Quadratic Equation Solver
Enter a, b, c and get the roots, discriminant, vertex, axis and full working.
Cold Brew Ratio Calculator
Perfect your coffee-to-water ratio, yield, servings and caffeine estimate.
Compost Ratio Calculator
Find the perfect carbon-to-nitrogen ratio for fast, odour-free composting.
Espresso Ratio Calculator
Dial in the perfect brew ratio, extraction yield and TDS for every shot.
Kombucha Ratio Calculator
Perfect your 1F brew ratios and 2F carbonation sugar — batch-size aware.
Dot Product Calculator
Compute dot products, angles, projections and cross products for 2D–5D vectors.
Matrix Determinant Calculator
Find the determinant of any 2×2 to 6×6 matrix with full step-by-step working.
Modular Exponentiation Calculator
Compute (a^b) mod m instantly — even for enormous cryptographic-size exponents.
Exponential Growth & Decay Calculator
Solve N(t) = N₀·e^(rt) — find future value, initial value, rate, or time.
Matrix Multiplication Calculator
Multiply, invert, transpose or find the determinant of matrices up to 6x6.
Cross Product Calculator (3D Vectors)
Compute a × b instantly — magnitude, angle, area and unit normal.
Vector Magnitude Calculator
Find the length of any 2-D, 3-D or n-D vector, get the unit vector and direction angles.
Cubic Equation Solver
Find all three roots of ax³ + bx² + cx + d = 0 with full working shown.
Decimal to Fraction Calculator
Convert any decimal — including repeating decimals — to its exact simplest fraction, with full step-by-step working.
Big Factorial Calculator — Exact BigInt Up to 10,000!
Compute exact factorials with BigInt, digit counts, scientific notation and full working steps.
Fibonacci Calculator
Find any Fibonacci number instantly, explore the golden ratio, and visualise the spiral.
Fraction to Percent Calculator
Convert any fraction, mixed number, or decimal to a percentage instantly.
Geometric Sequence Calculator
Find any term, the common ratio, or the sum of a geometric sequence instantly.
Greatest Common Factor Calculator
Find the GCF of two or more numbers with full prime-factor working and Euclid steps.
Percent Off Calculator
Find the sale price, saving, or original price for any discount instantly.
Quadratic Formula Calculator
Solve ax² + bx + c = 0 instantly — real and complex roots, full working, parabola diagram.
Simplify Fraction Calculator
Reduce any fraction to its lowest terms instantly, with full working shown.
System of Equations Solver
Solve 2x2 and 3x3 linear systems instantly with full working steps.
Least Common Multiple Calculator
Find the LCM of any list of integers — with prime-factor table, step-by-step working, and a cycle diagram.
Arithmetic Sequence Calculator
Find any term, the sum, or a missing value in an arithmetic sequence.
Cross-Multiplication Calculator
Solve any proportion instantly — enter three values, get the fourth.
Percent Error Calculator
Find the percent error between a measured and accepted value — or solve backwards.
Proportion Calculator
Solve any missing value in a/b = c/d instantly using cross-multiplication.
Summation Calculator
Compute sigma notation sums instantly — custom expressions, arithmetic, geometric, power, and harmonic series.
WACC Calculator
Compute the Weighted Average Cost of Capital with CAPM equity cost and the full tax shield.
Angle Between Vectors Calculator
Find the angle between any two 2-D, 3-D, or 4-D vectors — with full working.
Sine, Cosine & Tangent Calculator
Compute all six trig functions, inverses, unit-circle coordinates and wave graphs instantly.
Cartesian to Polar Calculator
Convert (x, y) to (r, θ) — or reverse — with full working and unit options.
Degrees to Radians Calculator
Convert degrees to radians, see trig values, arc length, sector area and angular motion — all in one tool.
Inverse Trig Calculator
Find angles from ratios — arcsin, arccos, arctan, arccot, arcsec, arccsc and the hyperbolic inverses.
Polar to Cartesian Calculator
Convert polar (r, θ) to Cartesian (x, y) — or reverse — instantly with step-by-step working.
Radians to Degrees Calculator
Convert any angle — see the formula, trig values, DMS and unit-circle coordinates instantly.
Trigonometric Identity Calculator
Verify and evaluate every major trig identity — basic, Pythagorean, double-angle, half-angle, sum-difference, product-to-sum, power-reduction, co-function and inverse.
Brine Ratio Calculator
Find the exact salt-to-water ratio for any brine: pickling, curing, fermentation or food-science.
Coffee-to-Water Ratio Calculator
Get the perfect coffee ratio for any brew method — pour-over, espresso, French press and more.
Ganache Ratio Calculator
Get the exact chocolate-to-cream ratio for truffles, glazes, tarts and more.
Rice Water Ratio Calculator
Perfect rice every time — correct water for any rice type, method and altitude.
Golden Ratio Typography Calculator
Generate a perfect type scale, line heights and measure using φ = 1.618.
Modular Scale Calculator
Generate harmonious type and spacing scales from a base size and musical ratio.
Time Duration Between Two Dates Calculator
Find the exact duration between any two dates — in years, months, days, hours, minutes and seconds.
Food, Cooking & Brewing
Cooking Measurement Converter
Convert cups, tablespoons, teaspoons, ml and litres for recipes.
Oven Temperature Converter
Convert oven temperatures between °C, °F and gas mark.
Recipe Scaler
Scale a recipe up or down by servings, ingredient by ingredient.
Slow Cooker Time Converter
Convert oven or stovetop times into slow cooker Low and High times.
Yeast Conversion Calculator
Convert between fresh, active dry and instant yeast.
Recipe Cost Calculator
Work out the true cost per serving of any recipe — pack price in, plate cost out.
Cooking Unit Converter
Convert cups, tablespoons, grams and millilitres — density-aware, and scale whole recipes.
Cooking Weight to Volume Converter
Convert grams to cups, tablespoons and teaspoons for any ingredient.
Oven Temperature Converter
Convert between Celsius, Fahrenheit and gas mark with a full reference table.
Beer ABV Calculator
Calculate alcohol by volume, apparent attenuation and calories from OG and FG.
Beer IBU Calculator
Calculate bitterness (IBUs) from hop additions using Tinseth or Rager.
Mash Efficiency Calculator
Know exactly how well your mash converted grain sugars to wort — batch after batch.
Mead ABV Calculator
Find the alcohol content of your mead from original and final gravity readings.
Pizza Dough Calculator
Exact ingredient weights for any number of balls, size, and hydration.
Priming Sugar Calculator
Bottle carbonation sugar amounts for any beer style, volume and temperature.
Wine ABV Calculator
Calculate wine alcohol content from starting and ending specific gravity.
Keg Size Calculator
Convert any keg volume and find out exactly how many pints you will pour.
Meat Curing Calculator
Precise salt, curing salt and sugar amounts for dry or wet cures.
Turkey Cooking Time Calculator
Get the exact cook time, rest time and oven start time for your turkey.
Ham Cooking Time Calculator
Exact oven times for any size ham — bone-in, boneless, fresh or pre-cooked.
Wine Bottles Per Guest Calculator
Find out exactly how many bottles of wine to buy for any event.
Sous Vide Time & Temperature Calculator
Find the exact bath temperature and minimum safe cooking time for any protein.
Butter Conversion Calculator
Convert butter between grams, ounces, cups, sticks, tablespoons and more — with full working shown.
Cooking Temperature Converter
Instantly convert oven temperatures between Celsius, Fahrenheit, Kelvin and UK Gas Mark.
Egg Substitute Calculator
Find the best vegan or allergy-friendly egg replacement for any recipe.
Yeast Conversion Calculator
Convert between active dry, instant, fresh cake, and sourdough starter — instantly.
Slow Cooker Conversion Calculator
Convert any oven or stovetop recipe to slow cooker settings in seconds.
Farming & Garden
Grass Seed Calculator
Work out how much lawn seed you need — and what it will cost.
Aquarium Volume Calculator
Find your tank volume in litres, US gallons and UK gallons — five shapes supported.
Garden & Raised-Bed Soil Volume Calculator
Find out exactly how many litres (or bags) of compost or topsoil your raised bed needs.
Plant Spacing Calculator
Find exactly how many plants fit your bed — square or triangular grid.
Hydroponic Nutrient Calculator
Calculate exact salt weights for any reservoir volume and EC target.
Pond Volume Calculator
Calculate pond volume, liner size, pump output, fish stocking and treatment doses.
Fertilizer NPK Calculator
Calculate nutrients delivered, required application rates, and bags needed from any NPK grade.
Seeding Rate Calculator
Calculate the exact kg/ha or lb/acre seeding rate for any crop — and back-calculate population, TSW or establishment.
Chicken Feed Calculator
Daily feed, water, and nutrient needs for any chicken type — layers, broilers, pullets, and more.
Crop Yield Calculator
Calculate yield per hectare or acre from any harvest quantity and field area.
Greenhouse Heating Calculator
Size your greenhouse heater in seconds — fabric loss, infiltration and all.
Irrigation Water Calculator
Calculate gross irrigation requirements, water volumes, and flow rates for any crop and field.
Stocking Density Calculator
Calculate animals per area or biomass per volume — with welfare band assessment.
Hay Bale Calculator
Calculate bale volume, dry matter and how many bales your livestock need.
Livestock Feed Calculator
Calculate daily feed, energy and protein requirements for cattle, sheep, pigs and poultry.
Silage Calculator
Clamp volume, field yield, DM tonnage and feeding days — all in one tool.
Home & DIY
Paint Calculator
How much paint to buy for any room — walls, coats and openings.
Tile Calculator
How many tiles to buy for a floor or wall, including waste.
Flooring Calculator
How many packs of laminate, vinyl or wood flooring to buy.
Concrete Calculator
Concrete volume and number of bags for a slab or footing.
Mulch Calculator
How much mulch, bark or compost to cover a garden bed.
Brick Calculator
Estimate how many bricks a wall needs, with a waste allowance.
Gravel Calculator
Work out the volume and weight of gravel for any area.
Fence Calculator
Count the posts, panels and rails for a fence run.
BTU Air Conditioner Calculator
Size an AC unit by working out the BTU your room needs.
Roof Pitch Calculator
Convert between rise/run, angle, percent and x-in-12 pitch.
BTU to kWh Converter
Convert BTU to kilowatt-hours and back, instantly.
Mulch & Soil Calculator
Bed size + depth → cubic yards or metres, bags needed and total cost.
Stairs Calculator
Turn total rise and run into steps, riser height, tread depth and stringer length — with building-code checks.
BTU Calculator
Size heating and cooling: room BTU plus the right air-conditioner.
Wallpaper Calculator
How many rolls of wallpaper you need — pattern repeat and cost included.
Fence and Gate Calculator
Run length, post spacing and gates to posts, panels, rails, concrete and cost.
Roof Area Calculator
Turn a building footprint and roof pitch into actual roof surface area, materials and cost.
Crushed Stone Calculator
Area, depth and material density to tonnes, bags and cost.
Asphalt Calculator
Turn area, depth and mix density into tonnes of asphalt — plus a cost estimate.
Flooring Calculator (Multi-Room, with Cost)
Packs of laminate, hardwood or vinyl across every room — plus cost and waste.
Pool Volume Calculator
Work out your pool volume in litres and gallons, plus chlorine dosing.
Brick Calculator
Wall area + brick size + mortar joint → bricks, mortar bags and cost.
Deck Building Calculator
Turn deck size into a board, joist and screw count — with a cost estimate.
Solar Panel Calculator
Size a solar array from your energy use or roof area — panels, output and savings.
Insulation Calculator
Area + target R-value + pack coverage → packs, rolls and cost.
Carpet Calculator
How much carpet to buy from a fixed-width roll — with waste, stairs and cost.
Drywall Calculator
Sheets of plasterboard, screws, compound and tape — with a cost estimate.
Paint Calculator
Wall area minus doors and windows, coats and coverage, to paint and cost.
3D Print Time & Material Estimator
Estimate print time, filament usage and material cost from model volume, infill and speed.
3D Print Filament Cost Calculator
Find the exact material cost of any print from grams used and spool price.
Board Foot Calculator
Instantly calculate board feet from lumber dimensions and get a material cost estimate.
Crochet Hook Size Converter
Instantly convert crochet hook sizes between US, UK and metric (mm).
Fabric Yardage Calculator
Enter your pattern pieces, pick a bolt width, and get the exact yardage to buy.
Knitting Gauge Calculator
Work out cast-on stitches and rows from your gauge swatch and target size.
Quilt Binding & Backing Calculator
Know exactly how much fabric to buy for binding and backing before you cut a single strip.
Resin 3D Print Cost Calculator
Find the exact material cost of any MSLA or DLP resin print from mL used and bottle price.
Yarn Yardage Calculator
Find exactly how many yards — and skeins — your knitting or crochet project needs.
Candle Wax Calculator
Work out exactly how much wax, fragrance oil and dye you need for any batch.
Epoxy Resin Calculator
Calculate exact Part A and Part B volumes for any mould shape and mix ratio.
Firewood Cord Calculator
Convert stack dimensions to full cords, face cords, BTU and seasonal cost.
Kerf Calculator
Calculate material loss from saw cuts and plan your cut list precisely.
Soap Lye Calculator
Calculate exact NaOH or KOH lye amounts for cold-process and liquid soapmaking.
Wood Shrinkage Calculator
Predict exact dimension loss as lumber dries from green to target moisture content.
Finance & Money
UK Mortgage Calculator
Work out monthly repayments, total interest and overpayment savings.
Compound Interest & Savings Calculator
Project savings growth with regular deposits and compound interest.
Free Invoice Generator
Build a branded invoice with line items, tax and totals, then export a clean PDF.
Loan & Personal Credit Calculator
Monthly payment, total cost of credit and representative APR.
Loan Comparison Tool
Compare up to 3 loans side by side — payment, total interest and a balance chart.
Tip Calculator & Bill Splitter
Split the bill, add a tip, round up and share the result.
Currency Converter
Convert between major currencies with live exchange rates.
Monthly Budget Planner
Track income and expenses, see your savings rate, and get a live spending chart.
Pakistan Salary Income Tax Calculator (FY 2024-25)
Monthly take-home after Pakistan income tax — salaried slabs for FY 2024-25.
Savings Goal Calculator
How much to save each month — or how long it takes.
ROI Calculator
Return on investment, net gain and annualised ROI.
Debt Snowball Calculator
See how fast extra payments clear your debts — snowball or avalanche.
Markup vs Margin Calculator
Convert between cost, price, markup and profit margin instantly.
Net Worth Calculator
Add up your assets and liabilities to find your net worth.
UAE Emirates ID Decoder & Validator
Decode a 15-digit Emirates ID — country prefix, birth year and Luhn check digit.
Simple Interest Calculator
Work out simple interest and the total amount on a deposit or loan.
APR Calculator
Find the true annual cost of a loan once fees are included.
Mortgage Overpayment Calculator
See how much interest and time a regular overpayment saves.
Loan Comparison Calculator
Compare two loans side by side to find the cheaper overall deal.
Salary to Hourly Converter
Convert pay between hourly, weekly, monthly and yearly in one place.
Future Value Calculator
Project the future value of savings with regular contributions and compounding.
Debt Avalanche Calculator
Pay off debt fastest — avalanche vs snowball, with a payoff order.
Investment Return Calculator
Project the future value of an investment with regular contributions.
Mortgage Affordability Calculator
See how much home you can afford from your income and deposit.
Amortization Schedule Generator
Full month-by-month payment breakdown for any loan.
Salary Raise Calculator
Turn a raise percentage into real money — after inflation.
Hourly to Annual Salary Calculator
Convert an hourly rate into yearly, monthly and weekly pay.
Sales Commission Calculator
Work out commission earnings from sales and rate — instantly.
Split Bill with Tax and Tip
Split a restaurant bill evenly including tax and tip.
Freelance Rate Calculator
Work out the hourly rate a freelancer needs to charge.
Debt Payoff Planner (Snowball vs Avalanche)
List your debts, compare snowball and avalanche, and see your debt-free date on a chart.
50/30/20 Budget Calculator
Split your take-home pay into needs, wants and savings.
Savings Rate Calculator
Find your savings rate and a rough years-to-FI estimate.
Refinance Break-Even Calculator
Find how long until a refinance pays for itself.
Mortgage Points Calculator
See if buying discount points is worth the up-front cost.
Coast FIRE Calculator
Find the portfolio you need today to coast to retirement.
Money Counter
Add up cash by counting notes and coins.
Expense Tracker
Log spending by category, see monthly totals and a category chart, then export to CSV.
Investment Scenario Comparison
Compare lump-sum, dollar-cost averaging and a mixed strategy side by side.
Tip Per Person Table
One bill and tip — see each person's share for any group size.
Salary Negotiation Modeler
Compare job offers side by side — base, bonus, equity and benefits as one total-comp number.
Savings Goal Tracker
Track multiple savings goals with progress bars and a projection chart.
Gross Rent Multiplier Calculator
Price relative to gross annual rent.
Coast FIRE Calculator (Pro)
See if your pot can coast to retirement, with a year-by-year chart.
Mortgage Overpayment Scenarios
Compare three overpayment strategies side by side on one mortgage.
Event Budget Planner
Plan event costs by category, track vendors and paid status, see the spend breakdown.
Net Worth Tracker
Log assets and liabilities over time and watch your net worth trend.
Debt-Free Date Calculator
See exactly when you'll be debt-free and how much interest you'll pay.
Group Expense Splitter
Add people and shared expenses, then see exactly who owes whom.
Savings Challenge Tracker
Run a 52-week or custom savings challenge, tick off weeks and watch your total grow.
Budget Forecaster
Turn recurring income and expenses into a 12-month projected balance chart.
Amortization Schedule Calculator
Loan amount, rate and term to a full month-by-month principal and interest table.
Invoice Tracker
Track who owes you, what is overdue, and your total outstanding — exportable to CSV.
Wedding Budget Planner
Track estimated vs actual costs, payments and your target — all in your browser.
Debt Snowball Tracker
Plan your debt payoff, compare snowball vs avalanche, and see the date you go debt-free.
Road Trip Cost Splitter
Plan a multi-leg road trip, total fuel, tolls and parking, then split fairly.
Freelance Project Quote Builder
Turn hours and rates into a polished client quote with deposit terms.
Sinking Fund Planner
Plan multiple savings goals and see exactly how much to set aside each month.
Multiplication Table Generator
Make printable times-table charts and blank practice worksheets, then export to PDF.
Car Loan Calculator
Monthly payment, total interest and a full schedule from price, deposit, trade-in, APR, term, fees and tax.
CAGR Calculator
Compound annual growth rate from a beginning and ending value.
Dividend Yield Calculator
Turn a share price and dividend into yield %, annual income and yield-on-cost.
Inflation Calculator
Convert money between two years and see how inflation erodes its buying power.
Rule of 72 Calculator
How long money takes to double — or the rate needed.
401(k) Calculator
Project your retirement balance from salary, contribution rate, employer match and returns.
Home Affordability Calculator
How much house can you afford? Income, debts and deposit to a max price.
Markup Calculator
Turn cost and markup into selling price, profit, and margin — or work it backwards.
Roth IRA Calculator
Project your tax-free retirement balance from contributions, years and return.
FIRE Number Calculator
Find your financial-independence target and how many years until you reach it.
Break-Even Calculator
Find how many units you must sell to cover your costs — with a chart.
Profit Margin Calculator
Cost and price to gross margin, markup, profit and break-even — with reverse solve.
Rent Affordability Calculator
Income, the 30% rule and your expenses — your recommended maximum rent.
Emergency Fund Calculator
Size your safety net and get a month-by-month plan to reach it.
Annuity Calculator
Calculate present value, future value, or periodic payment for any annuity.
Bond Price Calculator
Price a bond from its yield — or back-solve the YTM from a market price.
Bond Yield Calculator
Calculate YTM, bond price, duration, convexity and DV01 instantly.
Gross Profit Calculator
Calculate gross profit, gross margin %, and COGS ratio across multiple periods or product lines.
IRR Calculator
Find the Internal Rate of Return for any series of cash flows — instantly.
NPV Calculator
Calculate Net Present Value, IRR, payback period and a full discounted cash-flow schedule.
Perpetuity Calculator
Price any infinite stream of payments — ordinary, growing, or deferred.
Present Value Calculator
Discount any cash flow stream to today: lump sum, annuity, growing annuity, perpetuity.
Conversions & Units
Unit Converter
Convert length, weight, temperature, volume, area and speed instantly.
Acres to Hectares Converter
Convert ac to ha instantly — 1 ac = 0.4046856422 ha. Free, browser-only tool.
Acres to Square Metres Converter
Convert ac to m² instantly — 1 ac = 4046.856422 m². Free, browser-only tool.
Bar to PSI Converter
Convert bar to psi instantly — 1 bar = 14.50377378 psi. Free, browser-only tool.
Bytes to Kilobytes Converter
Convert B to KB instantly — 1 B = 0.001 KB. Free, browser-only tool.
Celsius to Fahrenheit Converter
Convert °C to °F instantly — °F = °C × 1.8 + 32. Free, browser-only tool.
Celsius to Kelvin Converter
Convert °C to K instantly — K = °C + 273.15. Free, browser-only tool.
Centimetres to Inches Converter
Convert cm to in instantly — 1 cm = 0.3937007874 in. Free, browser-only tool.
US Cups to Millilitres Converter
Convert cup to mL instantly — 1 cup = 236.5882365 mL. Free, browser-only tool.
Fahrenheit to Celsius Converter
Convert °F to °C instantly — °C = °F × 0.5555555556 − 17.77777778. Free, browser-only tool.
Feet to Metres Converter
Convert ft to m instantly — 1 ft = 0.3048 m. Free, browser-only tool.
US Gallons to Litres Converter
Convert gal to L instantly — 1 gal = 3.785411784 L. Free, browser-only tool.
Gigabytes to Megabytes Converter
Convert GB to MB instantly — 1 GB = 1000 MB. Free, browser-only tool.
Gigabytes to Terabytes Converter
Convert GB to TB instantly — 1 GB = 0.001 TB. Free, browser-only tool.
Grams to Ounces Converter
Convert g to oz instantly — 1 g = 0.03527396198 oz. Free, browser-only tool.
Hectares to Acres Converter
Convert ha to ac instantly — 1 ha = 2.471053815 ac. Free, browser-only tool.
Inches to Centimetres Converter
Convert in to cm instantly — 1 in = 2.54 cm. Free, browser-only tool.
Inches to Millimetres Converter
Convert in to mm instantly — 1 in = 25.4 mm. Free, browser-only tool.
Kilobytes to Bytes Converter
Convert KB to B instantly — 1 KB = 1000 B. Free, browser-only tool.
Kilobytes to Megabytes Converter
Convert KB to MB instantly — 1 KB = 0.001 MB. Free, browser-only tool.
Kelvin to Celsius Converter
Convert K to °C instantly — °C = K − 273.15. Free, browser-only tool.
Kilograms to Pounds Converter
Convert kg to lb instantly — 1 kg = 2.204622622 lb. Free, browser-only tool.
Kilograms to Stone Converter
Convert kg to st instantly — 1 kg = 0.1574730444 st. Free, browser-only tool.
Kilometres to Miles Converter
Convert km to mi instantly — 1 km = 0.6213711922 mi. Free, browser-only tool.
Kilometres per Hour to Knots Converter
Convert km/h to kn instantly — 1 km/h = 0.5399568035 kn. Free, browser-only tool.
Kilometres per Hour to Miles per Hour Converter
Convert km/h to mph instantly — 1 km/h = 0.6213711922 mph. Free, browser-only tool.
Knots to Kilometres per Hour Converter
Convert kn to km/h instantly — 1 kn = 1.852 km/h. Free, browser-only tool.
Pounds to Kilograms Converter
Convert lb to kg instantly — 1 lb = 0.45359237 kg. Free, browser-only tool.
Litres to US Gallons Converter
Convert L to gal instantly — 1 L = 0.2641720524 gal. Free, browser-only tool.
Litres to Millilitres Converter
Convert L to mL instantly — 1 L = 1000 mL. Free, browser-only tool.
Megabytes to Kilobytes Converter
Convert MB to KB instantly — 1 MB = 1000 KB. Free, browser-only tool.
Megabytes to Gigabytes Converter
Convert MB to GB instantly — 1 MB = 0.001 GB. Free, browser-only tool.
Metres to Feet Converter
Convert m to ft instantly — 1 m = 3.280839895 ft. Free, browser-only tool.
Miles to Kilometres Converter
Convert mi to km instantly — 1 mi = 1.609344 km. Free, browser-only tool.
Millilitres to US Cups Converter
Convert mL to cup instantly — 1 mL = 0.004226752838 cup. Free, browser-only tool.
Millilitres to Litres Converter
Convert mL to L instantly — 1 mL = 0.001 L. Free, browser-only tool.
Millimetres to Inches Converter
Convert mm to in instantly — 1 mm = 0.03937007874 in. Free, browser-only tool.
Ounces to Grams Converter
Convert oz to g instantly — 1 oz = 28.3495231 g. Free, browser-only tool.
PSI to Bar Converter
Convert psi to bar instantly — 1 psi = 0.0689475729 bar. Free, browser-only tool.
Square Feet to Square Metres Converter
Convert ft² to m² instantly — 1 ft² = 0.09290304 m². Free, browser-only tool.
Square Metres to Acres Converter
Convert m² to ac instantly — 1 m² = 0.0002471053815 ac. Free, browser-only tool.
Square Metres to Square Feet Converter
Convert m² to ft² instantly — 1 m² = 10.76391042 ft². Free, browser-only tool.
Stone to Kilograms Converter
Convert st to kg instantly — 1 st = 6.35029318 kg. Free, browser-only tool.
Terabytes to Gigabytes Converter
Convert TB to GB instantly — 1 TB = 1000 GB. Free, browser-only tool.
Area Calculator
Area of a rectangle, triangle, circle, trapezoid and more.
Volume Calculator
Volume of a box, sphere, cylinder, cone and more.
MPG to L/100km Converter
Convert miles-per-gallon to litres-per-100km and back, UK or US gallons.
Weighted Grade Calculator
Combine scores and category weights into a single weighted grade.
Julian to Gregorian Date Converter
Convert dates between the Julian and Gregorian calendars.
Hijri to Gregorian Converter
Convert an Islamic (Hijri) date to the Gregorian calendar.
Hebrew Calendar Converter
Convert a Gregorian date to the Hebrew (Jewish) calendar.
Persian (Jalali) Calendar Converter
Convert between Gregorian and Persian (Solar Hijri / Jalali) dates.
Ethiopian Calendar Converter
Convert between Gregorian and Ethiopian (Ge'ez) dates.
Thai Buddhist Date Converter (BE ⇄ CE)
Convert between Gregorian dates and the Thai Buddhist Era (พ.ศ.).
Nepali Bikram Sambat Converter (BS ⇄ AD)
Convert between Gregorian dates and the Nepali Bikram Sambat calendar.
Japanese Era Converter (Gengō / 和暦)
Convert between Gregorian dates and Japanese era years (Reiwa, Heisei…).
Coptic Calendar Converter (A.M. ⇄ Gregorian)
Convert between Gregorian dates and the Coptic calendar (Anno Martyrum).
Miles to Nautical Miles Converter
Convert mi to nmi instantly — 1 mi = 0.868976 nmi. Free, browser-only tool.
Celsius to Rankine Converter
Convert °C to °Ra instantly — °Ra = °C × 1.8 + 491.67. Free, browser-only tool.
Fahrenheit to Kelvin Converter
Convert °F to K instantly — K = (°F − 32) × 5/9 + 273.15. Free, browser-only.
Bits to Bytes Converter
Convert bits, bytes, kbit, KB, Mbit, MB, Gbit and GB — 1 byte = 8 bits.
File Size Converter
Convert B, KB, MB, GB, TB and binary KiB, MiB, GiB side by side.
Unit Price Comparison Calculator
Compare price per unit across pack sizes to find the best value.
Philippines TIN Validator
Check the structure of a Philippine tax ID number (TIN) instantly.
Grams to Kilograms Converter
Convert g to kg instantly — 1 kg = 1000 g. Free, browser-only tool.
Tonnes to Kilograms Converter
Convert t to kg instantly — 1 t = 1000 kg. Free, browser-only tool.
Yards to Meters Converter
Convert yd to m instantly — 1 yd = 0.9144 m. Free, browser-only tool.
Meters to Yards Converter
Convert m to yd instantly — 1 yd = 0.9144 m. Free, browser-only tool.
Miles to Yards Converter
Convert mi to yd instantly — 1 mi = 1760 yd. Free, browser-only tool.
Feet to Inches Converter
Convert ft to in instantly — 1 ft = 12 in. Free, browser-only tool.
Inches to Feet Converter
Convert in to ft instantly — 1 ft = 12 in. Free, browser-only tool.
Nautical Miles to Kilometers Converter
Convert nmi to km instantly — 1 nmi = 1.852 km. Free, browser-only tool.
Milliliters to Teaspoons Converter
Convert mL to US teaspoons (and back) instantly.
Milliliters to Tablespoons Converter
Convert mL to US tablespoons (and back) instantly.
Fahrenheit to Rankine Converter
Convert °F to °Ra (and back) instantly.
Square Kilometers to Square Miles Converter
Convert km² to mi² (and back) instantly.
Grams to Cups (Flour) Converter
Convert flour between grams and US cups by type.
Grams to Cups (Sugar) Converter
Convert sugar between grams and US cups by type.
Butter Converter
Convert butter between grams, ounces, cups, sticks and tablespoons.
Millilitres to Fluid Ounces Converter
Convert ml to US and UK fluid ounces, both ways.
Fuel Economy Comparison
Compare two vehicles by annual fuel cost — MPG or L/100km.
Frequency & Wavelength Calculator
Convert between frequency and wavelength for any wave.
Potential Energy Calculator
Gravitational PE = m·g·h — solve for energy, mass, or height.
Speed of Sound Calculator
Speed of sound in air at any temperature, plus travel time.
kWh to MJ Converter
Convert kilowatt-hours to megajoules and back, exactly.
Torque N·m to ft·lb Converter
Convert newton-metres to foot-pounds instantly — 1 ft·lb = 1.3558179 N·m. Free, browser-only.
Pascal to Bar Converter
Convert pascals to bar instantly — 1 bar = 100000 Pa. Free, browser-only.
Mbps to MB/s Converter
Convert internet speed in megabits to file transfer in megabytes per second.
Gbps to Mbps Converter
Convert gigabit per second link speeds to megabits per second.
Alcohol Units Calculator
UK units and US standard drinks from volume and ABV.
Rectangle Calculator
Area, perimeter and diagonal of a rectangle.
Sample Rate Converter
Find the resampling ratio between two audio sample rates.
Frame Rate Converter
Convert between video frame rates and frame counts.
Weeks to Days Converter
Convert weeks to days (and back) instantly.
Days to Hours Converter
Convert days to hours (and back) instantly.
Hours to Minutes Converter
Convert hours to minutes (and back) instantly.
Minutes to Seconds Converter
Convert minutes to seconds (and back) instantly.
Years to Months Converter
Convert years to months (and back) instantly.
Months to Weeks Converter
Convert months to weeks (and back) using the average month.
Kelvin to Fahrenheit Converter
Convert Kelvin to Fahrenheit and back.
Square Feet to Acres Converter
Convert square feet to acres and back.
Cups to Grams Rice Converter
Convert cups of rice to grams instantly — by rice type. Free, browser-only.
Tablespoons to Cups Converter
Convert tbsp to cups instantly — 1 cup = 16 tbsp. Free, browser-only tool.
US Quarts to Litres Converter
Convert qt to L instantly — 1 qt = 0.946352946 L. Free, browser-only tool.
US Pints to Millilitres Converter
Convert pt to mL instantly — 1 pt = 473.176473 mL. Free, browser-only tool.
US Gallons to Cups Converter
Convert gal to cups instantly — 1 gallon = 16 cups. Free, browser-only tool.
Fluid Ounces to Millilitres Converter
Convert fl oz to mL instantly — 1 fl oz = 29.5735 mL. Free, browser-only tool.
Water Intake by Body Weight Calculator
How much water to drink based on your weight.
Air Fryer Conversion Calculator
Convert any oven recipe to air fryer temperature and time.
Egg Size Substitution Calculator
Swap small, medium, large or jumbo eggs in any recipe.
International Shoe Size Converter
Convert shoe sizes between US, UK, EU and centimetres.
Hat Size Converter
Turn head circumference into US, UK, EU and S–XL hat sizes.
Bra Size Converter
Convert bra sizes between UK, US, EU, FR and AU/NZ.
Glove Size Converter
Convert hand circumference into numeric and S–XL glove sizes.
Belt Size Converter
Find your belt size from waist measurement in inches, cm or letters.
GPA to Letter Grade Converter
Turn a 4.0-scale GPA into its letter grade instantly.
Milligrams to Grams Converter
Convert mg to g instantly — 1 g = 1000 mg. Free, browser-only tool.
Micrograms to Milligrams Converter
Convert µg to mg instantly — 1 mg = 1000 µg. Free, browser-only tool.
Centimeters to Meters Converter
Convert cm to m instantly — 1 m = 100 cm. Free, browser-only tool.
Kilometers to Meters Converter
Convert km to m instantly — 1 km = 1000 m. Free, browser-only tool.
Millimeters to Centimeters Converter
Convert mm to cm instantly — 1 cm = 10 mm. Free, browser-only tool.
Miles per Gallon UK to US Converter
Convert fuel economy between UK and US miles per gallon.
Knots to MPH Converter
Convert knots to miles per hour, both directions.
Weekly Meal Planner and Shopping List
Plan a week of meals and auto-build a combined shopping list.
Unit Price Comparator
Compare products by price per kg, litre or item to find the best value.
PPI Calculator
Turn resolution and screen size into pixels-per-inch, dot pitch and a retina check.
Fuel Economy Converter
Convert MPG (US/UK), L/100km and km/L instantly, with a cost estimate.
Weighted Random Picker
Pick winners with custom odds — weighted, cryptographically fair, with live stats.
Power Converter
Convert watts, kilowatts, megawatts, horsepower, BTU/h and ft·lb/s.
Area Converter
Convert between mm², cm², m², hectares, km², acres, square feet and more.
Clothing Size Converter (US / UK / EU / IT)
Convert clothing sizes between US, UK, EU and Italian sizing for tops, dresses and jackets.
Shoe Size Converter
Convert shoe sizes between US, UK, EU and CM for men, women and kids.
Angle Converter
Convert between degrees, radians, gradians, turns, arcminutes and arcseconds.
Data Storage Converter
Convert bits, bytes, KB, MB, GB, TB and PB in decimal (1000) or binary (1024) mode.
Energy Converter
Convert joules, calories, watt-hours, BTU, foot-pounds and electronvolts.
Frequency Converter
Convert Hz, kHz, MHz, GHz, RPM and period (seconds) — type any field, the rest update live.
Length Converter
Convert between mm, cm, m, km, inches, feet, yards, miles and more — live.
Pressure Converter
Convert between Pa, kPa, bar, psi, atm, mmHg, torr and inHg instantly.
Speed Converter
Convert between m/s, km/h, mph, knots, ft/s and Mach instantly.
Temperature Converter
Convert Celsius, Fahrenheit, Kelvin and Rankine with exact formulas.
Time Unit Converter
Convert between nanoseconds, seconds, hours, days, weeks, months and years.
Torque Converter
Convert torque between N·m, kgf·m, lbf·ft, lbf·in and dyn·cm.
Volume Converter
Convert ml, litres, cubic metres, teaspoons, cups, pints, quarts and gallons (US and UK).
Weight & Mass Converter
Convert milligrams, grams, kilograms, tonnes, ounces, pounds, stones and tons in one live grid.
Ring Size Converter
Convert ring sizes between US, UK, EU, circumference and diameter.
Speed Distance Time Calculator
Enter any two of speed, distance, or time — instantly solve for the third.
Wavelength & Frequency Calculator
Convert wavelength, frequency and photon energy in any direction.
Julian Date Converter
Convert Gregorian dates to Julian Dates (JD, JDN, MJD) and back — instantly in your browser.
Celsius to Fahrenheit Converter
Instantly convert between °C, °F, Kelvin, Rankine and Réaumur — with formulas shown.
Kg to Pounds Converter
Instantly convert kilograms to pounds (and stones + pounds) — or reverse.
Fahrenheit to Celsius Converter
Instantly convert any temperature between °F and Celsius — with full working shown.
Grams to Ounces Converter
Instantly convert grams to ounces (and back) with the exact NIST factor.
Ounces to Grams Converter
Convert oz to g instantly — 1 oz = 28.3495 g. Free, browser-only tool.
Pounds to Kilograms Converter
Instantly convert lb to kg — decimal or stone+lb entry, full conversion grid.
Stone to Pounds Converter
Convert st to lb instantly — 1 stone = 14 pounds exactly. Free, browser-only tool.
Pounds to Stone Converter
Convert pounds to stones and pounds — with kilograms too.
Date & Time
Age Calculator
Your exact age in years, months and days — plus next-birthday countdown.
India PAN Card Decoder — Validate & Decode Your PAN
Decode every segment of an Indian PAN — holder type, name initial, and series.
Date Difference Calculator
Days, weeks and full calendar gap between any two dates.
Week Number Calculator
ISO 8601 and US week number for any date.
Add or Subtract Days Calculator
Add or subtract days, weeks, months or years from a date.
Day of the Week Finder
What day of the week was — or will be — any date.
Easter Date Calculator
Find the date of Easter Sunday for any year.
Age in Weeks and Days Calculator
Convert any age or date span into weeks and days.
Egypt National ID Decoder — Date of Birth, Governorate & Gender
Decode a 14-digit Egyptian National ID — century, date of birth, governorate and gender.
Age in Hijri Years Calculator
Convert your birth date to the Islamic calendar and get your age in Hijri years.
Ramadan Date Estimator
Estimate the Gregorian date Ramadan begins in any year.
Diwali Date Estimator
Find the date of Diwali (Lakshmi Puja) for any year.
Days Until a Date
Count how many days are left until any date — or how many have passed.
Weeks Between Two Dates
Count the number of weeks (and leftover days) between any two dates.
Age in Months and Days
Find an exact age in months and days from any birth date.
Next Birthday Countdown
See how many days until your next birthday and which weekday it falls on.
Dog Age Calculator
Convert your dog's age to human years by size and breed group.
Cat Age Calculator
Convert your cat's age to human years and life stage.
Days Alive Calculator
Find out exactly how many days you have been alive.
Age on Other Planets
See how old you would be on Mars, Jupiter and every other planet.
Countdown to New Year
Live countdown to midnight on 1 January in your local time.
Half-Birthday Calculator
Find your half-birthday — six months from the day you were born.
Data Cap Usage Calculator
Track data used against your monthly cap and project end-of-cycle usage.
Storage Needed Calculator
Estimate total storage for a batch of files from count and average size.
Work Days Between Dates
Count the working days between two dates, weekends excluded.
ISO Week Number Calculator
Find the ISO 8601 week number for any date.
Julian Day Number Calculator
Convert a calendar date to its Julian Day Number, JD and MJD.
Days in Month Calculator
How many days are in any month of any year?
Weekly Time Card Calculator
Add up a week of clock-in / clock-out times and breaks.
Age Gap Calculator
Find the age difference between two people.
Countdown to Christmas
Live days, hours, minutes and seconds until Christmas Day.
Countdown to Birthday
Live countdown to your next birthday from your date of birth.
Sprint Date Calculator
Generate agile sprint start and end dates from a cadence.
Mileage Log & Reimbursement Tracker
Log business trips and auto-calculate mileage reimbursement, with CSV export.
Printable Calendar Generator
Make a clean printable PDF calendar for any month or full year.
CCTV Storage Calculator
Size hard drives for a security camera system: cameras, resolution, retention.
Day of Week Calculator
Find any date's weekday, ISO week number, day-of-year and Julian Day Number — with step-by-step working.
Quarter of Year Calculator
Find which quarter any date falls in — with fiscal-year variants and progress bars.
Days Since Calculator
Find exactly how many days, weeks, months and years between any two dates.
Add Days to Date Calculator
Add or subtract any number of days from a date and see the full result instantly.
Days Until Birthday Calculator
Instantly see how many days until any birthday — with zodiac, birthstone, milestones and a live countdown.
Days Until Christmas Calculator
Exact days, sleeps, weeks and hours until Christmas Day — live, in your time zone.
Months Between Dates Calculator
Find the exact number of complete calendar months between any two dates.
Subtract Days from Date Calculator
Pick any date, enter a number of days, get the exact result instantly.
Weekly Time Card Calculator
Total your hours worked, split regular vs overtime, and calculate gross pay — all in one place.
Weeks Between Dates Calculator
Count the exact weeks (and leftover days) between any two dates instantly.
Working Hours Calculator
Add up daily shifts, subtract breaks, and compute gross pay with overtime.
Photo & Video
Download Time Calculator
Estimate how long a download takes from file size and connection speed.
Bandwidth Calculator
Estimate monthly bandwidth from page weight and visits per month.
Video File Size Calculator
Estimate a video file's size from duration and bitrate.
Audio File Size Calculator
Estimate audio file size for MP3, AAC or uncompressed WAV.
Upload Time Calculator
Estimate how long a file takes to upload at your real connection speed.
Depth of Field Calculator
Near/far limits, hyperfocal distance, solve-for-any-variable and full aperture comparison.
Hyperfocal Distance Calculator
Focal length, aperture and sensor CoC to maximum depth of field — solve any variable.
Crop Factor Calculator
Sensor size to crop factor, equivalent focal length and equivalent aperture — instant and precise.
More Calculators
Indonesia NIK (KTP) Decoder
Decode a 16-digit Indonesian NIK — province, date of birth and gender.
JAMB / Post-UTME / WAEC Aggregate Score Calculator
Work out your Nigerian university aggregate from JAMB, Post-UTME and O'level.
UK Statutory Entitlement Calculator (Maternity, Redundancy, Notice)
Work out Statutory Maternity Pay, redundancy pay and notice using 2025/26 rates.
Kenya Payslip & Net Pay Calculator (PAYE, SHIF, NSSF, Housing Levy)
Net pay after PAYE, SHIF, NSSF and the Affordable Housing Levy, explained.
Discount & Sale Price Calculator
Find the sale price, work out % off, or combine multiple stacked discounts.
Fuel Cost Calculator
Calculate trip fuel cost in miles/mpg or km/L per 100km, with cost splitting.
Brazil MEI DAS Calculator — Monthly Simples Nacional Payment (2025)
Calcule o DAS mensal do MEI por tipo de atividade — valores fixos 2025.
GPA Calculator
Calculate your GPA — US 4.0, UK Honours, or India 10-point CGPA.
Mexico RFC & CURP Decoder + ISR Net Pay Calculator (2024)
Decode your RFC or CURP and see your take-home pay after ISR — all in your browser.
Malaysia SST Calculator (Sales and Services Tax) 2025
Add or extract Malaysia Sales and Services Tax at 8% — instant result in your browser.
Mexico IVA Calculator (Impuesto al Valor Agregado) 2025
Add or extract Mexico Impuesto al Valor Agregado at 16% — instant result in your browser.
SIP Calculator
Project the future value of a monthly SIP investment.
Hours Between Times Calculator
Duration between two clock times, with break deduction.
Road Trip Cost Calculator
Estimate the fuel cost of a journey and split it between passengers.
EV Charging Cost Calculator
Work out the cost of charging your electric car from any % to any %.
Car Depreciation Calculator
Project a car's resale value year by year using a declining-balance rate.
Grade Calculator
Add your assignments and points to get your overall grade and letter.
Final Grade Needed Calculator
Find the exact score you need on your final to hit your target grade.
Words Per Minute Typing Test
Measure your typing speed in WPM with live accuracy tracking.
UK Degree Classification Calculator
Work out your credit-weighted average and honours classification.
Spain NIF / NIE / DNI Validator
Check the control letter of a Spanish DNI, NIE or NIF instantly.
Poland PESEL Decoder
Decode date of birth, sex and check digit from a Polish PESEL.
South Africa ID Number Decoder
Decode birth date, gender and citizenship from a South African ID.
Chile RUT Validator
Verify a Chilean RUT/RUN verifier digit and get the correct one.
Leap Year Checker
Check if any year is a leap year and see why.
Day of Year Calculator
Find the ordinal day number and ISO week for any date.
Discount Stacking Calculator
Combine multiple discounts and see the true compounded saving.
Germany Steuer-ID Validator (Steuerliche Identifikationsnummer)
Check an 11-digit German Steuer-ID with the official MOD 11,10 check digit.
France NIR / Numéro de Sécurité Sociale Validator
Validate a French social-security number and decode its 13-digit structure.
Sweden Personnummer Decoder & Luhn Validator
Decode a Swedish personnummer — date of birth, gender and Luhn check digit.
Finland HETU Decoder (Henkilötunnus)
Decode a Finnish HETU — date of birth, gender and modulo-31 control character.
Denmark CPR Number Decoder
Decode a Danish CPR (personnummer) — date of birth, gender and century.
Norway Fødselsnummer Decoder
Decode a Norwegian fødselsnummer — date of birth, gender and checksum.
Belgium National Number Decoder
Decode a Belgian Rijksregisternummer — date of birth, gender, checksum.
Pakistan CNIC Validator & Decoder
Check a 13-digit Pakistani CNIC and read its province and gender digit.
Bangladesh NID Validator
Check a 10, 13 or 17-digit Bangladesh NID and read its embedded fields.
Malaysia MyKad Decoder
Decode a 12-digit MyKad — date of birth, place of birth and gender.
Thailand National ID Validator
Validate a 13-digit Thai National ID with its official mod-11 check digit.
China Resident ID Decoder & Validator
Decode an 18-character Chinese ID and verify its ISO 7064 check character.
Vietnam CCCD Decoder
Decode a 12-digit Vietnamese CCCD — province, birth year and gender.
Nigeria NIN Validator — Check Your 11-Digit NIN Format
Validate the format of a Nigerian National Identification Number offline.
Kenya National ID Validator — Check ID Number Format
Validate the format of a Kenyan national ID number offline.
Ghana Card PIN Validator — Check GHA Number Format
Validate the GHA-NNNNNNNNN-N format of a Ghana Card PIN offline.
Tanzania NIDA Number Validator & Decoder
Validate a 20-digit Tanzanian NIDA NIN and decode its date of birth.
Uganda NIN Validator & Decoder — Class, Gender & Birth Year
Validate a 14-character Ugandan NIN and decode its class, gender and birth-year digits.
Saudi Iqama & National ID Validator
Validate a 10-digit Saudi ID or Iqama with the official check-digit algorithm.
Israel Teudat Zehut (ID) Validator
Validate an Israeli Teudat Zehut number with the official checksum.
Morocco CIN / CNI Validator
Check a Moroccan CIN format and read the issuing-bureau region from the prefix.
Jordan National ID Validator
Check a 10-digit Jordanian National Number and read its generation marker.
Argentina CUIT / CUIL Decoder
Verify an Argentine CUIT/CUIL check digit and read its type prefix and DNI.
Colombia Cédula & NIT Validator
Check a Colombian cédula format and compute the NIT modulo-11 check digit.
Peru DNI Validator
Format-check a Peruvian DNI and compute its RENIEC verification digit.
Ecuador Cédula Validator
Validate an Ecuadorian cédula with the official modulo-10 algorithm.
Chile RUT / RUN Checker
Verify a Chilean RUT/RUN verifier digit with the modulo-11 algorithm.
US SSN Format Validator — Check Social Security Number Structure
Validate the structure of a US Social Security Number against SSA rules.
Australia TFN Validator — Tax File Number Checksum
Validate an Australian Tax File Number with the ATO modulus-11 checksum.
New Zealand IRD Number Validator — Check Digit Verification
Validate a New Zealand IRD number with the Inland Revenue modulus-11 check.
India Aadhaar Format Validator — Verhoeff Checksum Check
Validate the format of an Indian Aadhaar number with the Verhoeff checksum.
Chinese Zodiac Finder
Find your Chinese zodiac animal, element and yin-yang from your birth date.
Watts to Kilowatt-Hours (kWh) Calculator
Turn watts and running time into kWh — kWh = (W × hours) ÷ 1000. Free, browser-only.
Data Transfer Cost Calculator
Estimate cloud or CDN egress cost from volume, price per GB and free tier.
Gross to Net Pay Estimator
Estimate take-home pay from gross using your own deduction percentages.
Steps to Distance Calculator
Convert daily steps into kilometres, miles and estimated calories.
Modulo Calculator (Remainder)
Find a mod n — both the truncated and floored remainder conventions.
Work Hours Calculator
Add up a weekly timesheet — daily hours, breaks and optional gross pay.
Rent vs Buy Calculator
Compare the long-term cost of renting versus buying a home.
Scientific Calculator
Evaluate expressions with trig, logs, roots, powers, and factorials.
What Day Was I Born
Find out which day of the week you were born on.
Spain CIF Validator
Check the control character of a Spanish company tax ID (CIF) instantly.
Indonesia NPWP Validator
Check the structure of an Indonesian taxpayer number (NPWP) instantly.
Switzerland AHV Validator
Check the EAN-13 check digit of a Swiss AHV / AVS number instantly.
Greece AMKA Decoder
Decode the birth date and check digit of a Greek AMKA instantly.
Credit Card Payoff Calculator
How long to clear a card — and what the interest costs.
Lease vs Buy Calculator
Compare the true cost of leasing against buying with finance.
Child Height Predictor
Estimate a child's adult height from the parents' heights.
Time Until the Weekend
Live countdown to Saturday — how long until the weekend.
Parallel Resistance Calculator
Total resistance of resistors wired in parallel.
Series Resistance Calculator
Total resistance of resistors wired in series.
Power (Watts) Calculator
Electrical power from voltage, current and resistance.
Work and Power Calculator
Work W = F·d·cos θ and power P = W/t or P = F·v.
Music Interval Calculator
Transpose a frequency by any interval and see ratios in cents.
Video Bitrate Calculator
Work out video file size from bitrate and duration, or the reverse.
Cost-Plus Pricing Calculator
Set a selling price by adding a markup to your unit cost.
Hourly Rate Calculator
Convert an annual salary into an equivalent hourly rate.
Smoking Cost Calculator
See what smoking costs per day, month, year and beyond.
Slope Calculator
Slope, equation and angle of a line through two points.
Distance Between Two Points Calculator
Straight-line distance between two coordinates.
Midpoint Calculator
Find the midpoint between two coordinates.
Quarter Calculator
Find which calendar quarter a date falls in, with start and end dates.
Fiscal Year Calculator
Find the fiscal year for any date — UK, US, Australia and more.
Polynomial Roots Calculator
Find the real and complex roots of quadratic and cubic equations.
Exposure Value (EV) Calculator
Compute EV and EV100 from aperture, shutter and ISO.
F-Stop Calculator
Stops difference and light change between two apertures.
FPS Timecode Calculator
Convert HH:MM:SS:FF timecode to frames and real time.
Bitrate Calculator (Audio + Video)
Find the bitrate needed to fit a target file size.
Zakat Calculator
Work out zakat at 2.5% on wealth above the nisab threshold.
Tithe Calculator
Calculate your tithe from gross or net income at any rate.
Change Maker Calculator
Work out change owed and the fewest notes and coins to give it.
Sweat Rate Calculator
Work out how much fluid you lose during exercise.
Blood Type Inheritance Calculator
Predict a child's possible blood types from both parents.
Period & Cycle Tracker
Predict your next period, ovulation and fertile window.
Body Frame Size Calculator
Small, medium or large frame from height and wrist.
Resting Metabolic Rate Calculator
Estimate your RMR and daily calorie needs.
Semester Weeks Calculator
Count how many weeks a semester or term runs from start to end.
Time Tracker & Timesheet
Start and stop timers per project, see daily and weekly totals, export a CSV timesheet.
Rent vs Buy Comparison Calculator
Full multi-year comparison with breakeven point and net-worth chart.
Exam Time Per Question Calculator
Pace your exam — how long to spend on each question.
Group Gift Splitter
Split a group gift fairly — down to the last cent.
Road Trip Time Estimator
How long will the drive really take — with rest stops added.
Parking Cost Calculator
Find the cheapest way to pay — hourly, daily cap or weekly pass.
Grade Tracker
Track every course, weight each assignment and see the score you need on the final.
Subscription Tracker
Track every subscription, see your true monthly and yearly spend, and never miss a renewal.
Tax Bracket Visualizer
See how a progressive tax schedule splits your income — marginal vs effective, on a stacked bar.
Cap Rate Calculator
Capitalization rate from NOI and property value.
Cash-on-Cash Return Calculator
Annual cash flow as a percentage of cash invested.
Inventory Turnover Calculator
How many times you sell through stock per year.
Darts Checkout Calculator
Find a 1–3 dart finish for any score from 2 to 170.
Light Travel Time Calculator
How long light takes to cross any distance in space.
Pomodoro Estimator
Estimate how long a set of pomodoros will really take.
Cycling Power Estimator
Estimate the watts needed to ride at a given speed.
Screen Time Cost Calculator
See how many hours and how much your daily screen time really adds up to.
Travel Itinerary Planner
Plan trips day by day with timed activities, costs and a printable PDF.
Weekly Schedule Maker
Build a colour-coded weekly timetable and export it to PDF.
Bill Reminder Tracker
Track every recurring bill, see what is due, and never miss a payment.
Timesheet Maker
Log daily hours per project, see totals and billable amounts, export to CSV.
Subscription Cost Tracker
Track every subscription, see your true monthly and yearly spend, and never miss a renewal.
Portfolio Rebalancer
Turn target allocations into exact buy and sell amounts.
Project Timeline Calculator
Turn task estimates in working days into real start and finish dates.
Final Grade Calculator
Work out the exact score you need on your final exam to hit your target grade.
Semester GPA Planner
Track every semester, see your cumulative 4.0 GPA, and reverse-solve a target.
Half-Life Calculator
Solve radioactive decay for remaining amount, time or half-life — with a decay chart.
Density Calculator
ρ = m ÷ V — solve for density, mass, or volume with full unit conversion
Force Calculator (F = ma)
Newton's second law — solve for force, mass, or acceleration with full unit handling.
Dew Point Calculator
Temperature + relative humidity → dew point, comfort rating, wet-bulb temp.
Heat Index Calculator
Temperature + humidity → feels-like heat index with risk category, in °C and °F.
Wind Chill Calculator
Find the real feels-like temperature: air temp + wind speed → wind chill with frostbite risk.
Japan Consumption Tax Calculator
Add or remove Japan's 10% standard or 8% reduced consumption tax instantly.
Ten-Pin Bowling Score Calculator
Enter each roll and watch the official scorecard fill in automatically.
Cricket Net Run Rate (NRR) Calculator
Calculate your tournament NRR correctly — with the bowled-out rule applied.
Cricket Run Rate Calculator
Instantly calculate CRR and RRR — current and required run rates for any match situation.
Darts Checkout Calculator
Find every valid finish for any score from 2 to 170.
Golf Handicap Calculator
Score differentials and Handicap Index using the World Handicap System (WHS).
Race Time Predictor
Predict finish times across every distance from one known race result.
Run/Walk Interval Calculator
Plan your run-walk intervals, find your effective pace and finish time.
Resting Metabolic Rate Calculator
Five peer-reviewed equations, macro splits, formula working — all in your browser.
Watts per kg Calculator
Find your cycling W/kg and Coggan category in seconds.
Body Frame Size Calculator
Determine your skeletal frame size and ideal body weight range instantly.
Doubling Time Calculator
How long until your money, population, or investment doubles?
Drone Flight Time Calculator
Physics-based flight time from battery, mass, rotors and altitude.
Country Plug Type Finder
Instantly look up the plug type, voltage and frequency for any country.
Name Day Finder
Find the name day for any first name — or discover which names are celebrated on any date.
What Time Is It In…?
Instant live clock for any city or country — runs entirely in your browser.
Zodiac Sign Calculator
Find your Western zodiac sign, element, quality and ruling planet from your birthday.
Chinese Zodiac Calculator
Find your animal sign, element, Yin/Yang polarity and lucky attributes from your birth date.
Country Dialing Code Lookup
Find any country dialing code instantly and convert local numbers to international format.
Country Driving Side Lookup
Instantly check whether any country drives on the left or right side of the road.
Mixed Number Calculator
Add, subtract, multiply and divide mixed numbers with full working shown.
Time Zone Difference Calculator
Compare the current time (or any custom time) across multiple time zones instantly.
Developer Tools
JSON & Data
JSON Formatter & Validator
Pretty-print, minify and validate JSON instantly.
SQL Playground
Run real SQL against an in-browser SQLite database — no install, no server.
CSV Explorer & Cleaner
Paste or upload a CSV, then sort, filter, de-duplicate and export it.
JSON to CSV Converter
Flatten a JSON array of objects into clean CSV.
CSV to JSON Converter
Turn CSV into a clean JSON array of objects.
JSON to YAML Converter
Convert JSON into clean, readable YAML.
YAML to JSON Converter
Convert YAML config into formatted JSON.
XML Formatter & Minifier
Pretty-print or minify XML right in your browser — nothing is uploaded.
YAML Formatter & Re-indenter
Normalise YAML indentation and spacing in your browser — no upload.
SQL Formatter & Beautifier
Pretty-print SQL queries in your browser — keywords on their own lines.
JSON to XML Converter
Convert JSON objects and arrays into well-formed XML.
XML to JSON Converter
Convert XML documents into clean, structured JSON.
JSON to TOML Converter
Convert JSON into clean TOML config syntax.
TOML to JSON Converter
Convert TOML config files into structured JSON.
JSON to TypeScript Interface
Generate TypeScript interfaces from a JSON sample.
JSON Escape / Unescape
Encode text into a JSON string or decode it back.
CSV to TSV Converter
Convert comma-separated values to tab-separated values.
TSV to CSV Converter
Convert tab-separated values to proper RFC 4180 CSV.
JSON to SQL INSERT Generator
Turn a JSON array of objects into SQL INSERT statements.
CSV to SQL INSERT Generator
Turn a CSV file into SQL INSERT statements.
JSON String Escape / Unescape
Escape text into a JSON string literal, or unescape it back.
JSON Minifier
Compact JSON to a single line and validate it.
JSON Diff Tool
Compare two JSON documents and see what changed.
JSON to Go Struct
Generate Go structs with json tags from a JSON sample.
JSON to Zod Schema
Generate a Zod validation schema from a JSON sample.
SQL Cheatsheet
The everyday SQL statements, grouped and searchable — copy any one.
JSONPath Tester
Test JSONPath expressions against your JSON, live in the browser.
Mock JSON Generator
Generate realistic mock JSON records for users, products and posts.
JSONPath Query Playground
Paste JSON, run JSONPath expressions, see matched values and their paths live.
Excel (XLSX) to CSV & JSON Converter
Upload a spreadsheet, pick a sheet, preview it, and export clean CSV or JSON.
JSON to .env Converter
Turn a JSON config object into dotenv key=value lines — in your browser.
.env to JSON Converter
Parse a dotenv file into a clean JSON object — privately in your browser.
JSON Flattener
Flatten nested JSON into single-level dot-path keys — in your browser.
JSON Unflattener
Rebuild nested JSON from flat dot-path keys — privately in your browser.
JSON Key Sorter
Sort JSON object keys alphabetically and recursively — in your browser.
SQL IN Clause Builder
Turn a list of values into a ready-to-paste SQL IN (...) clause.
CSV to HTML Table
Convert CSV into a clean, escaped HTML <table> you can paste anywhere.
HTML Table to CSV
Extract any HTML <table> into clean, properly quoted CSV.
JSON Schema Generator
Paste JSON and infer a ready-to-use JSON Schema you can copy or download.
CSV Merger
Combine two or more CSV files by stacking rows or joining on a key column.
YAML / JSON / TOML Converter
Paste any of the three formats and convert instantly between them.
CSV Statistics Analyzer
Upload a CSV and get instant per-column stats, distributions and histograms.
JSON Flatten / Unflatten
Convert nested JSON to dot-notation keys and back, losslessly.
SQL and GraphQL Formatter
Paste a messy SQL or GraphQL query and pretty-print it with clean indentation.
JSON Pretty-Diff
Compare two JSON documents and see exactly what was added, removed or changed.
JSON to Protobuf Schema Generator
Paste sample JSON and infer a ready-to-use Protocol Buffers .proto file.
JSON to TypeScript Interfaces
Paste JSON, get clean nested TypeScript interfaces or type aliases.
SQL Minifier
Collapse formatted SQL into the smallest valid one-line statement.
CSV Diff Tool
Compare two CSV files by a key column and see added, removed and changed rows.
CSV to JSON Converter (and JSON to CSV)
Convert CSV to a JSON array or JSON back to CSV — with delimiter and header controls.
TOML ⇄ JSON Converter
Convert between TOML and JSON in either direction, with validation.
YAML to JSON Converter (Both Directions)
Paste YAML or JSON, convert either way with validation and clear error messages.
Nested JSON Flattener
Flatten nested JSON to dot-notation keys, unflatten back, and export flat CSV.
Query String Parser & Builder
Parse a URL query into an editable table, then rebuild and copy it.
Product Schema Generator
Generate valid schema.org Product JSON-LD for rich Google results.
Breadcrumb Schema Generator
Generate valid schema.org BreadcrumbList JSON-LD in seconds.
FAQ Schema Generator
Build valid FAQPage JSON-LD structured data in seconds.
Schema Markup Generator
Generate valid JSON-LD structured data for any schema.org type instantly.
Video Schema Generator
Generate valid schema.org VideoObject JSON-LD for better video SEO.
Article Schema Generator
Build valid JSON-LD structured data for any article type in seconds.
Local Business Schema Generator
Generate valid schema.org/LocalBusiness JSON-LD for Google Rich Results — free and instant.
Encoding & Crypto
JWT Decoder
Decode any JSON Web Token instantly — header, payload, and timestamps.
Base64 Encoder
Encode text to Base64 — standard or URL-safe — in your browser.
Base64 Decoder
Decode Base64 back to text — standard and URL-safe — in your browser.
URL Encoder
Percent-encode text and URLs — component or full-URL mode.
HTML Entity Encoder & Decoder
Escape and unescape HTML entities — safely, in your browser.
SHA-1 Hash Generator
Generate a SHA-1 hash from any text instantly — in your browser.
SHA-256 Hash Generator
Generate a SHA-256 hash from any text instantly — in your browser.
SHA-512 Hash Generator
Generate a SHA-512 hash from any text instantly — in your browser.
MD5 Hash Generator
Generate an MD5 hash from any text instantly — in your browser.
CRC-32 Checksum Generator
Compute a CRC-32 checksum from any text — hex and decimal, in your browser.
UUID v4 Generator
Generate random RFC 4122 UUID v4 identifiers in bulk.
UUID v1 Generator
Generate time-based RFC 4122 UUID v1 identifiers.
UUID v7 Generator
Generate sortable, timestamp-prefixed UUID v7 identifiers.
ULID Generator
Generate sortable, URL-safe ULID identifiers.
Nano ID Generator
Generate compact, URL-safe Nano IDs with custom length and alphabet.
JWT Claims Explainer
Decode a JWT and see what every standard claim actually means.
Color Shades & Tints Generator
Generate tints, shades and a full tonal scale from any base colour.
JWT Generator (HS256)
Sign HS256 JSON Web Tokens in your browser with Web Crypto.
CSS Color Shades & Tints Generator
Build shades and tints of any colour and copy them as CSS variables.
Tailwind Shade Generator
Turn one colour into a full Tailwind 50–950 palette config.
Color From Text Hash
Turn any string into a consistent, repeatable color.
HMAC Generator
Keyed-hash message authentication codes — SHA-256, SHA-384, SHA-512.
Base32 Encoder & Decoder
Encode and decode RFC 4648 Base32 — case-insensitive, A–Z and 2–7.
Base58 Encoder & Decoder
Encode and decode Base58 using the Bitcoin alphabet.
SHA3-256 Hash Generator
Generate FIPS 202 SHA3-256 (Keccak) hashes in your browser.
RIPEMD-160 Hash Generator
Generate 160-bit RIPEMD-160 hashes in your browser.
CSS Box Shadow Generator
Build a box-shadow with live preview and copy the CSS.
CSS Text Shadow Generator
Style a text-shadow with live preview and copy the CSS.
Base64 URL-Safe Encoder
Encode and decode Base64URL (RFC 4648 §5) for tokens and URLs.
Quoted-Printable Encoder
Encode and decode Quoted-Printable (RFC 2045) email content.
Punycode Converter
Convert between Unicode domains and Punycode (xn--) per RFC 3492.
Base85 Encoder
Encode and decode Base85 (Z85) — compact 4-byte to 5-char binary text.
ASCII85 Encoder
Encode and decode Adobe ASCII85 used in PostScript and PDF.
File Hash & Checksum Tool
Compute MD5, SHA-1, SHA-256 and SHA-512 for any file — and verify it.
JWT Builder
Build and sign a JSON Web Token (HS256) entirely in your browser.
Multiple Box Shadow Generator
Stack, reorder and tune layered CSS box-shadows with a live preview.
Hash Generator (SHA-1 / SHA-256 / SHA-384 / SHA-512)
Hash text or files with multiple SHA algorithms at once and verify checksums.
CSS Text-Shadow Generator
Build layered text shadows visually and copy the CSS.
Base64 File Encoder & Decoder
Encode any file to Base64 or a data URL, and decode Base64 back to a downloadable file.
UUID / ULID Batch Generator
Generate hundreds of v4 UUIDs or ULIDs at once, then copy or download.
Text Encryptor (AES-256)
Password-encrypt any text with AES-256-GCM, entirely in your browser.
HTML Entity Encoder / Decoder
Convert text to and from HTML entities — named and numeric.
Base32 Encoder / Decoder
Encode and decode text to RFC 4648 base32, right in your browser.
URL Encoder / Decoder
Percent-encode or decode URLs and query values — component or full-URL mode, batch lines, copy.
String Escape Tool
Escape or unescape a string for JSON, JavaScript, CSV, SQL, regex and shell.
Base58 Encoder / Decoder
Bitcoin-style Base58 and Base58Check encode and decode, right in your browser.
Color
Color Converter + WCAG Contrast Checker
Convert hex, RGB, and HSL colours instantly — and check WCAG contrast ratios.
Hex to Text Converter
Convert hex bytes to text and text to hex — UTF-8, in your browser.
WCAG Color Contrast Checker
Check text and background colors against WCAG AA and AAA contrast ratios.
Decimal to Hex Converter
Convert any whole number to hexadecimal, with optional 0x prefix.
Hex to Decimal Converter
Turn any hexadecimal value into its base-10 number.
Hex to RGB Converter
Turn any hex colour code into an RGB value instantly.
RGB to Hex Converter
Convert RGB channel values into a hex colour code.
RGB to HSL Converter
Convert RGB colour values into hue, saturation and lightness.
HSL to RGB Converter
Convert hue, saturation and lightness into RGB values.
Hex to CMYK Converter
Convert a hex colour code into CMYK for print work.
Color Name to Hex Converter
Look up the hex code for any CSS named colour.
CSS Gradient Generator
Build linear and radial CSS gradients with a live preview and copy-ready code.
Complementary Color Finder
Find complementary, analogous, triadic and tetradic colour harmonies.
Color Blindness Simulator
See how a colour looks with protanopia, deuteranopia and tritanopia.
Random Color Palette Generator
Generate harmonious 5-colour palettes with copy-ready hex and CSS.
RGB to HSV Converter
Convert RGB colour values into hue, saturation and value.
CMYK to RGB Converter
Convert print CMYK percentages into screen RGB values.
Hex to HSL Converter
Convert a hex colour code into hue, saturation and lightness.
RGBA to Hex Converter
Convert RGBA colour with alpha into an 8-digit hex code.
HSV to RGB Converter
Convert hue, saturation and value into RGB colour values.
Contrast Grid Checker
WCAG contrast ratios for every colour pair in your palette, at a glance.
Monochrome Palette Generator
Build a cohesive single-hue palette from one base colour.
Analogous Color Finder
Find harmonious neighbour colours on the colour wheel.
Color Temperature Converter (Kelvin to RGB)
Turn a Kelvin colour temperature into an approximate sRGB colour.
Pantone to Hex (Approximate)
Look up an approximate screen hex for a Pantone PMS coated colour.
Hex to Pantone (Approximate)
Find the closest Pantone PMS coated colours to any hex value.
Color Mixer (Blend Two Colors)
Blend two colours at any ratio — gamma-correct or simple sRGB.
Triadic Color Scheme Generator
Build a balanced triadic palette — three hues 120° apart.
CSS Gradient Generator (Pro)
Build multi-stop linear, radial and conic CSS gradients visually, then copy the code.
CSS Text Gradient Generator
Create gradient-filled text and copy the CSS.
CSS Color Names List
All CSS named colors with hex and RGB — searchable.
CSS Conic Gradient Generator
Build colour wheels, pie charts and angular sweeps with a draggable conic editor.
Color Contrast Checker
Check WCAG contrast ratio for two colors with live AA/AAA pass-fail.
Color Format Converter
Convert a colour between HEX, RGB, HSL and HWB live — with a picker and alpha.
Color Scale Builder
Generate an even, multi-stop colour ramp with CSS, JSON and SVG export.
CSS Color Names
Searchable list of every named CSS colour with swatch, hex, rgb and hsl.
WCAG Contrast Checker
Instant AA/AAA contrast ratio check with sRGB-accurate maths and fix suggestions.
Hex to RGBA Converter
Instantly convert any hex colour to rgba(), rgb(), HSL, CSS variables and Tailwind classes.
Color Contrast Ratio Checker
Calculate the exact WCAG contrast ratio with full step-by-step formula working.
CSS & Frontend
Favicon Generator
Create favicon PNGs in all sizes — 16 to 512 px — right in your browser.
robots.txt Generator
Generate a robots.txt with allow, disallow, crawl-delay and sitemap.
Meta Tags Generator
Generate SEO, Open Graph and Twitter Card meta tags for any page.
CSS Specificity Calculator
Calculate the specificity of any CSS selector as an (a, b, c) score.
CSS Minifier
Compress stylesheets by stripping comments and whitespace.
CSS Flexbox Cheatsheet
Every flexbox property, grouped and searchable — copy any one-liner.
CSS Grid Cheatsheet
Every CSS grid property, grouped and searchable — copy any one-liner.
CSS Properties Reference
Common CSS properties grouped by purpose and searchable.
CSS Border Radius Generator
Round corners individually or together with a live preview.
CSS Transform Generator
Combine translate, rotate, scale and skew with a live preview.
CSS Filter Generator
Blur, brightness, contrast, grayscale, sepia and more — live preview.
CSS Clip-Path Generator
Polygon clip-path shapes — triangles, hexagons, stars and custom.
CSS Glassmorphism Generator
Frosted-glass cards with backdrop-filter blur, tint and border.
Cubic Bezier Generator
Drag the curve to craft custom cubic-bezier() easing for CSS.
CSS Animation Keyframes Generator
Fade, slide, bounce, spin and shake @keyframes with live preview.
Favicon Kit Generator
Turn one image into a complete favicon set — ICO, PNGs, manifest and zip.
Spreadsheet Lite — Online Grid with Formulas
A fast browser spreadsheet with SUM/AVG formulas and CSV + XLSX import & export.
UTM Link Builder
Build tagged campaign URLs with utm_source, utm_medium and more.
Canonical URL Builder
Normalise a URL and build its rel=canonical tag.
CSS Grid Generator
Build a CSS grid layout visually and copy the code.
CSS Flexbox Playground
Experiment with flexbox properties and copy the CSS.
CSS Triangle Generator
Make CSS triangles with the border trick and copy the code.
CSS Scrollbar Styler
Style custom scrollbars and copy cross-browser CSS.
CSS Variables Generator
Build a :root block of CSS custom properties and copy it.
CSS Unit Converter
Convert between px, rem, em, pt, pc and physical CSS units.
CSS Animation Builder
Multi-stop @keyframes editor with a live preview and copy-ready CSS.
CSS clamp() Generator
Turn min/max sizes and a viewport range into a responsive clamp() value.
CSS Aspect Ratio and object-fit Helper
Visualize aspect ratios and object-fit, then copy ready-to-paste CSS.
Cubic Bezier Easing Editor
Drag, preview and export cubic-bezier() easing curves for CSS.
CSS Grid Layout Builder
Paint named template areas, size every track, copy grid-template CSS.
Border Radius Generator (Elliptical, Per-Corner)
Design rounded and elliptical corners with live preview and copy-ready CSS.
Flexbox Playground
Visually build a CSS flexbox layout and copy the exact HTML and CSS.
CSS Formatter & Minifier
Beautify, minify and tidy CSS in your browser — sort properties, shorten hex, copy.
CSS Pattern Generator
Build repeating geometric backgrounds — stripes, dots, grids, checks — and copy the CSS.
Robots Meta Tag Generator
Generate correct robots meta tags with indexing, follow and snippet controls.
Sitemap URL Counter
Paste any sitemap.xml and instantly count every URL with full metadata analysis.
Canonical Tag Checker
Validate your canonical link tag and catch canonicalisation errors instantly.
Generators
.gitignore Generator
Build a .gitignore from language, OS and editor templates.
URL Slug Generator
Turn any title into a clean, SEO-friendly URL slug.
Random PIN Generator
Generate secure random numeric PINs of any length, right in your browser.
Pronounceable Password Generator
Create strong passwords you can actually say and remember.
API Key Generator
Generate secure random API keys in hex, base62 or base64url, with an optional prefix.
htpasswd Generator
Create Apache/Nginx .htpasswd entries with APR1 (MD5) or SHA-1 hashing.
Random Username Generator
Generate memorable usernames from random adjectives and nouns.
Strong Passphrase Generator
Build memorable, high-entropy passphrases from random words.
Random Date Generator
Generate random dates within any range and format.
Modular Scale Generator
Build a harmonious type scale from a base size and ratio.
Design Tokens Generator
Turn a base colour into a full tint/shade ramp and exportable design tokens.
Test Credit Card Number Generator
Luhn-valid fake card numbers for sandbox & form testing.
Random MAC Address Generator
Valid random MAC addresses in any format — colon, hyphen, Cisco.
Random IP Address Generator
Random IPv4 & IPv6 addresses, public-only option included.
Random User Generator
Fake people with name, email, phone & address for test data.
Mock Data Generator
Define typed fields, generate thousands of realistic rows, export JSON, CSV or SQL.
Password Entropy Calculator
Measure password strength in bits and estimated time to crack.
Dockerfile Generator
Build a clean, cache-friendly Dockerfile from a stack preset — copy or download.
Nginx Config Generator
Build a production-ready nginx server block from simple options.
Advanced Password Generator
Cryptographically random passwords with a live entropy and strength meter.
Slugify Tool — Text to URL Slug Generator
Turn any title into a clean, URL-safe slug with full control.
India PIN Code Validator
Instantly check whether an Indian PIN code is structurally valid.
Philippines Phone Number Validator
Validate any Philippine mobile or landline number — network, area code and E.164 format.
Open Graph Preview Generator
See exactly how your link card looks on Facebook, Twitter, Slack, and Discord before you publish.
Hreflang Tag Generator
Generate correct hreflang tags for every international page in seconds.
URL Slug Generator for SEO
Turn any page title into a clean, search-engine-friendly URL slug instantly.
Formatters & Minifiers
India GSTIN Validator
Validate a 15-character GSTIN — state code, PAN and base-36 check digit.
HTML Formatter & Minifier
Pretty-print or minify HTML in your browser — nothing is uploaded.
JavaScript Minifier
Strip comments and whitespace to shrink your JS.
HTML Minifier
Shrink HTML by removing comments and collapsing whitespace.
ISO 8601 Date Formatter
Format any date as a standards-compliant ISO 8601 string.
Reference & Cheatsheets
Regex Tester with Plain-English Explainer
Test regular expressions live and see them explained in plain English.
Regex Builder & Tester
Build, test and debug regular expressions with live match highlighting.
HTTP Status Codes Reference
Every HTTP status code with its meaning — searchable and instant.
MIME Types Reference
Look up the right Content-Type for any file extension — searchable.
Git Commands Cheatsheet
The everyday Git commands, grouped and searchable — copy any one.
Linux Commands Cheatsheet
The everyday Linux terminal commands, grouped and searchable — copy any one.
Docker Commands Cheatsheet
The everyday Docker commands, grouped and searchable — copy any one.
Regex Replace Tool
Find and replace with regular expressions and capture groups.
ISO Country Codes Reference
Look up ISO 3166-1 alpha-2, alpha-3 and numeric country codes.
ISO Currency Codes Reference
Look up ISO 4217 currency codes, numbers and minor units.
International Calling Codes Reference
Find the international dialling (country) code for any country.
Time Zone List Reference
Browse IANA time zone names and their UTC offsets.
ISO Language Codes Reference
Look up ISO 639-1 and 639-2 language codes and native names.
HTML Tags Reference
Every common HTML element grouped and searchable.
File Extensions Reference
Common file extensions and what they mean — searchable.
Port Numbers Reference
Well-known TCP and UDP ports and their services — searchable.
Emoji Shortcodes Reference
GitHub and Slack emoji shortcodes — searchable, click to copy.
DNS Record Types Reference
Searchable list of DNS record types — A, AAAA, CNAME, MX, TXT and more.
Regex Syntax Reference
Searchable cheat sheet of regular-expression tokens, quantifiers and flags.
Markdown Syntax Reference
Searchable cheat sheet of Markdown syntax — headings, emphasis, lists, links and code.
Vim Commands Cheat Sheet
Searchable cheat sheet of Vim commands — modes, motion, editing, search and files.
Unicode Blocks Reference
Common Unicode blocks with their code-point ranges and contents.
HTTP Methods Reference
GET, POST, PUT and the rest — safe, idempotent, cacheable.
ASCII Control Codes Reference
The 33 ASCII control characters — abbr, caret and escape.
HTTP Status Codes Reference
Searchable list of HTTP status codes with meaning and when to use each.
ASCII Table Reference
Every ASCII code in decimal, hex, octal, binary and HTML entity — searchable, click-to-copy.
MIME Type Finder
Look up the MIME type for any file extension — or vice versa.
HTTP Headers Reference
Searchable list of HTTP request and response headers with purpose, example and direction.
Regex Cheatsheet & Tester
A categorized regex token reference plus a live, highlighting tester.
Git Command Builder
Pick an action — branch, stash, undo, rebase — and get the exact git command plus a plain-English explanation.
ID & Number Validators
Text Diff Checker
Compare two blocks of text line by line and highlight every change.
Luhn Algorithm Checker
Validate any number with the Luhn (mod-10) checksum.
IBAN Validator
Check any IBAN with the ISO 13616 mod-97 algorithm.
Credit Card BIN Checker
Identify the card network from a BIN / IIN prefix.
EU VAT Number Validator
Check the format of any EU VAT number — all 27 member-state patterns.
UK VAT Number Validator
Verify a UK VAT number's check digit with HMRC's mod-97 algorithm.
Australian ABN Validator
Check an 11-digit ABN with the ATO's mod-89 checksum algorithm.
ISBN Validator
Validate ISBN-10 and ISBN-13 check digits and convert between them.
Semver Range Checker
Check whether a version satisfies an npm semver range like ^1.2.0.
Russia INN Validator
Check a Russian INN (10 or 12 digit) check digits — in your browser.
Ukraine INN Validator
Decode a Ukrainian tax number (RNOKPP) — date, gender and checksum.
Serbia JMBG Decoder
Decode a Serbian JMBG — date of birth, region, gender and checksum.
Austria SVNR Validator
Decode an Austrian social-security number — date and check digit.
Meta Title Length Checker
Check title-tag length in characters and approximate SERP pixels.
Keyword Density Checker
Count word frequency and density in any text to avoid keyword stuffing.
IEEE 754 Floating-Point Converter
Decimal to IEEE 754 single and double precision bits.
Credit Card Validator
Luhn checksum plus card-brand detection — all in your browser.
India PAN Validator — Check Every Rule in Your PAN
Validate all structural rules in an Indian PAN and decode every embedded field.
Poland PESEL Validator
Verify any Polish PESEL number — checksum, birth date, gender, century.
India Aadhaar Number Validator
Verify any 12-digit Aadhaar with a full Verhoeff checksum and step-by-step trace.
Brazil CNPJ Validator
Verify Brazilian company ID numbers with the real two-step mod-11 algorithm.
Croatia OIB Validator
Verify a Croatian OIB with the ISO 7064 MOD 11,10 check digit — and see every step.
Brazil CPF Validator
Validate a CPF with real MOD-11 check digits, see the algorithm step by step, and decode the embedded fiscal region.
Canada SIN Validator — Social Insurance Number Checker (Luhn)
Validate a Canadian SIN with the Luhn checksum and read its province or temporary-resident flag.
Ireland PPS Number Validator
Validate an Irish PPSN with full modulo-23 check-character verification and step-by-step working.
Czech Rodné číslo Validator
Validate a Czech birth number and decode its hidden birth date and gender.
Denmark CPR Number Validator
Validate a Danish CPR number — date, serial, century, gender and legacy mod-11 check.
Estonia Isikukood Validator
Verify an Estonian personal ID code — control digit, birth date and gender decoded instantly.
Finland HETU Validator
Validate a Finnish henkilötunnus with the full DVV mod-31 algorithm.
Italy Codice Fiscale Validator
Validate an Italian tax code with full checksum verification and decoded birth data.
Norway Fødselsnummer Validator
Validate a Norwegian national ID number with full mod-11 checksum verification.
South Korea RRN Validator
Verify a Korean Resident Registration Number with the real mod-11 check-digit algorithm.
Spain DNI / NIE Validator
Verify a Spanish DNI or NIE in one click — control letter, mod-23 algorithm explained.
Sweden Personnummer Validator
Validate a Swedish personal identity number and extract birth date, gender and county.
Romania CNP Validator
Validate a Romanian CNP and decode birth date, gender and county.
Bulgaria EGN Validator
Validate a Bulgarian EGN with weighted-checksum verification and birth-date + region extraction.
Lithuania Asmens Kodas Validator
Verify any Lithuanian personal code and extract birth date, gender and century.
Mexico CURP Validator
Verify any 18-character CURP with the real RENAPO check-digit algorithm and decode birth date, gender and state.
Albania NID Validator
Validate an Albanian Personal Number (NUP) and read its embedded birth date, gender and citizen type.
Colombia NIT Validator
Compute and verify the DIAN check digit for any Colombian NIT.
Iceland Kennitala Validator
Verify an Icelandic kennitala with the official Lund weighted mod-11 check digit.
Taiwan National ID Validator
Verify a ROC National ID number and decode its embedded district and gender.
Germany Personalausweis Document-Number Validator
Verify the 9-character German national ID document number using the ICAO 9303 check-digit algorithm.
Malaysia MyKad Validator
Validate a 12-digit MyKad number: date, place of birth, gender and serial.
North Macedonia EMBG Validator
Validate a Macedonian EMBG and decode birth date, gender and region.
Serbia JMBG Validator
Validate a Serbian JMBG number with full modulo-11 checksum and decoded fields.
Slovenia EMŠO Validator
Verify any Slovenian EMŠO number and decode its birth date, gender, and region.
Ukraine RNOKPP Validator
Verify a Ukrainian tax number and decode its embedded birth date, gender and checksum.
Uruguay CI Validator
Verify the check digit on a Uruguayan Cédula de Identidad instantly.
Argentina CUIL Validator
Verify an Argentine CUIL with the ANSES mod-11 checksum and decode the type prefix.
Egypt National ID Validator
Validate a 14-digit Egyptian National ID and decode its birth date, governorate and gender.
Greece AMKA Validator
Validate a Greek social security number with the full Luhn checksum algorithm.
Kazakhstan IIN Validator
Validate a Kazakhstan IIN with two-pass checksum verification and birth-date, gender and century extraction.
Morocco CIN Validator
Validate a Moroccan national ID number and decode the issuing bureau.
Thailand National ID Validator
Verify a 13-digit Thai national ID against the official DOPA check-digit formula.
Netherlands BSN Validator
Verify a Dutch Burgerservicenummer with the full elfproef (11-test) breakdown.
Portugal NIF Validator
Validate a Portuguese NIF with mod-11 check digit — see WHY it passes or fails.
Canada Postal Code Validator
Instantly check whether a Canadian postal code is structurally valid.
France Phone Number Validator
Validate any French phone number against the ARCEP national plan — instantly, in your browser.
Germany Postcode Validator
Instantly validate any German PLZ and identify its federal state and region.
Austrian IBAN Validator
Instantly validate any Austrian IBAN — BLZ, account number and ISO 7064 checksum.
Belgian IBAN Validator
Verify a Belgian IBAN with ISO mod-97 and the national check digits.
Danish IBAN Validator
Instantly verify any Danish bank account number in IBAN format.
German IBAN Validator
Validate a German IBAN with ISO 7064 MOD-97, BLZ structure and Kontonummer checks.
Italian IBAN Validator
Validate any Italian IBAN instantly — CIN, ABI, CAB and MOD-97 checksum checked.
Luxembourg IBAN Validator
Instantly verify any Luxembourg IBAN against the ISO 7064 MOD-97-10 standard.
Norwegian IBAN Validator
Validate any Norwegian IBAN with Modulus-11 and ISO 7064 checks.
Polish IBAN Validator (NRB)
Validate any Polish IBAN instantly — checksum, bank code and branch decoded.
Saudi Arabia IBAN Validator
Instantly verify any SA IBAN against ISO 7064 MOD-97 and the SAMA bank-code registry.
Swedish IBAN Validator
Instantly verify any Swedish bank account number in IBAN format — ISO 7064 checksum, clearing number and bank name included.
Netherlands Postcode Validator
Instantly check whether a Dutch postcode is structurally valid.
Pakistan Phone Number Validator
Verify any Pakistani mobile or landline number — format, operator, city.
UK Phone Number Validator
Instantly check if a UK phone number is valid, identify its service type and get the correct formatted versions.
US Phone Number Validator
Instantly check whether a US phone number is structurally valid under NANP rules.
US ZIP Code Validator
Validate any US ZIP-5 or ZIP+4 code with prefix-range and state lookup.
France Postcode Validator
Validate any French postcode (code postal) and instantly identify the department and region.
Netherlands IBAN Validator
Verify any Dutch IBAN with the full NL BBAN structure check and ISO 7064 MOD-97 algorithm.
Australia Phone Number Validator
Validate any Australian phone number against the ACMA Numbering Plan — mobile, geographic, freecall and more.
Bangladesh Phone Number Validator
Instantly check any Bangladeshi mobile number format and identify the operator.
Brazil CEP Validator
Validate a Brazilian postal code, decode its state and macro-region, and classify the suffix type — all offline.
Germany Phone Number Validator
Validate any German phone number — landline, mobile, or service number — and get the correct E.164 format instantly.
Greek IBAN Validator
Validate any Greek IBAN instantly — bank code, branch code and MOD-97 checksum verified.
Irish IBAN Validator
Validate an Irish IBAN with full MOD-97 checksum verification and BBAN structure breakdown.
Swiss IBAN Validator
Validate a Swiss IBAN with ISO 7064 MOD-97, IID structure and account format checks.
Indonesia Phone Number Validator
Validate any Indonesian mobile or landline number against the BRTI numbering plan.
Japan Postal Code Validator
Validate any Japanese 7-digit postal code and identify its prefecture instantly.
Kenya Phone Number Validator
Instantly check any Kenyan phone number format, operator and E.164 form.
Nigeria Phone Number Validator
Instantly check if a Nigerian phone number is valid and identify the network operator.
South Africa Phone Number Validator
Instantly validate and format any South African phone number — local, E.164 or +27 prefix.
UK Postcode Validator
Instantly check any UK postcode against the Royal Mail format spec and see the area, district, sector and unit breakdown.
Portugal IBAN Validator
Validate a Portuguese IBAN with ISO mod-97 + Banco de Portugal local check digits.
Australia Postcode Validator
Check any 4-digit Australian postcode against the Australia Post Addressing Standard — state, delivery type and allocation confirmed instantly.
Brazil Phone Number Validator
Validate any Brazilian phone number against ANATEL E.164 rules — area code, mobile 9th digit, and line type decoded instantly.
Egypt Phone Number Validator
Instantly verify any Egyptian phone number and identify the mobile operator or governorate.
French IBAN Validator
Verify a French IBAN with the RIB key check and ISO 7064 mod-97.
UAE IBAN Validator
Verify any United Arab Emirates IBAN with the full ISO 7064 MOD-97-10 checksum.
India Phone Number Validator
Validate any Indian mobile or landline against the TRAI numbering plan — operator, circle, and E.164 format included.
Turkey TC Kimlik No Validator
Verify the two check digits of a Turkish national ID number instantly.
Spain IBAN Validator
Validate a Spanish IBAN — MOD-97 checksum + both internal CCC check digits explained.
Turkey IBAN Validator
Validate a Turkish IBAN — MOD-97 checksum, bank code lookup and full BBAN breakdown.
Finnish IBAN Validator
Instantly verify any Finnish bank account number in IBAN format — ISO 7064 checksum, bank code and issuing bank included.
China Resident ID Validator
Verify an 18-character Chinese Resident Identity Card number and decode its embedded data.
Meta Description Length Checker
Instantly see if your meta description is the right length for Google.
Title Tag Length Checker
Check whether your HTML title tag fits Google's SERP display limit.
SEO & Web
More Developer Tools
Merge PDF
Combine multiple PDFs into one, drag to reorder, download — nothing uploaded.
Cron Expression Explainer
Translate any cron expression into plain English — and build your own.
URL Decoder
Decode percent-encoded text and URLs back to readable form.
Case Converter
Convert text between camelCase, snake_case, PascalCase, kebab-case and more.
Unix Timestamp Converter
Convert Unix epoch timestamps to dates and back — UTC, local, ISO and relative.
IP Subnet / CIDR Calculator
Work out network, broadcast, host range and mask from any IPv4 CIDR.
Binary to Decimal Converter
Turn any binary number into its base-10 value instantly.
Decimal to Binary Converter
Convert any whole number to binary, grouped for readability.
Decimal to Octal Converter
Convert any whole number to octal (base 8) instantly.
Roman Numeral Converter
Convert numbers to Roman numerals and back, both directions.
User-Agent Parser
Break a browser User-Agent string into browser, engine, OS and device.
MAC Address Lookup
Decode a MAC address — vendor OUI, unicast/multicast and local/universal.
DNS Record Explainer
Understand DNS record types and parse any zone-file line.
Glob Pattern Tester
Test glob patterns against a list of paths in real time.
Timestamp to Relative Time Converter
Turn a Unix timestamp into "3 hours ago" or "in 2 days".
Milliseconds to Time Converter
Break milliseconds into days, hours, minutes, seconds.
Epoch Milliseconds Converter
Convert between epoch milliseconds and human dates.
Time Ago Calculator
How long ago was a date — in plain language.
HAR File Viewer
Inspect a .har network capture without uploading it.
PX to EM Converter
Convert pixels to em relative to a parent font size.
Golden Ratio Calculator
Split any length into golden-ratio segments using φ ≈ 1.618.
Open Graph Tag Preview
Preview your Open Graph link card and generate the meta tags.
IP to Binary Converter
Convert an IPv4 address to binary, hex and decimal.
CIDR to IP Range
Expand a CIDR block to its network, broadcast and host range.
Subnet Mask Converter
Convert between CIDR prefix and dotted-decimal subnet mask.
IPv6 Expander
Expand a compressed IPv6 address to its full 8-group form.
IP Class Finder
Find the class (A–E) and scope of any IPv4 address.
Rotate PDF Pages
Turn sideways or upside-down PDF pages the right way up, then export.
Base-N Number Converter
Convert a number between any bases from 2 to 36.
Two's Complement Calculator
Signed decimal to two's complement binary and hex.
Binary Arithmetic Calculator
Add, subtract, multiply, divide and bitwise on binary numbers.
PDF Watermark
Stamp a text or image watermark onto every page of a PDF — opacity, position and rotation, all in your browser.
Cron Expression Builder
Build, decode and preview cron schedules visually — see the next runs instantly.
Gantt Chart Maker
Plan a project timeline with tasks, dependencies and a critical path — then export a PNG.
Pivot Table Builder
Turn raw CSV into a summarised pivot table — drag fields, aggregate, export.
URL Parser
Break a URL into protocol, host, port, path, query and hash.
Slug From Title
Turn a headline into a short, clean URL slug.
Markdown to Jira
Convert Markdown into Jira wiki markup for tickets and comments.
Jira to Markdown
Convert Jira wiki markup back into clean Markdown.
PDF Text Extractor
Pull all the text out of a PDF and copy or download it as a .txt file.
Crontab Expression Builder
Build and read cron schedules field by field.
Kebab Case to Camel Case Converter
Turn 'kebab-case' identifiers into 'camelCase' instantly.
Snake Case to Camel Case Converter
Turn 'snake_case' identifiers into 'camelCase' instantly.
Camel Case to Snake Case Converter
Turn 'camelCase' identifiers into 'snake_case' instantly.
Constant Case Converter
Turn any text into 'CONSTANT_CASE' for env vars and constants.
Dot Case Converter
Turn any text into 'dot.case' for keys and namespaces.
Add Page Numbers to a PDF
Stamp Bates-style page numbers onto any PDF — position, format and font your way.
Chart Maker
Paste a table, pick bar, line or pie, then export a high-resolution PNG.
HTML Live Editor
Write HTML, CSS and JS and see the result render live.
cURL to Code Converter
Paste a curl command, get ready-to-run fetch, axios, Python or PHP code.
PDF Metadata Editor
View and edit a PDF's title, author, subject and keywords, then export.
Link-in-Bio Page Builder
Build a personal link-in-bio page and export it as one standalone HTML file.
PDF Form Filler
Load a fillable PDF, type into its fields, then flatten and download.
Data Anonymizer
Mask emails, names, phones and cards in CSV or JSON with realistic fakes.
Sign PDF Online
Draw or type a signature, place it on any page, and download a signed PDF.
Conventional Commit Builder
Build a spec-compliant Conventional Commits message and copy it in one click.
PDF N-up: Multiple Pages Per Sheet
Arrange 2, 4, 6, 8, 9 or 16 PDF pages on one sheet for printing.
PDF Cropper
Trim page margins and set a new crop box on every page — preview and download.
Delete Pages from a PDF
Remove unwanted pages from a PDF and download the trimmed file.
ZIP Archive Explorer
Open a .zip in your browser, browse its files, preview text and images, and extract any file.
PDF Booklet Imposition Tool
Reorder PDF pages into 2-up saddle-stitch booklet print order.
Crontab to Human
Paste a cron expression and get a plain-English schedule plus the next run times.
PDF Text Per Page
Extract the text from each PDF page into a labelled, copyable list.
Batch Timestamp Converter
Convert a whole list of Unix timestamps and dates at once — timezone-aware, copy and export.
Number Base Converter
Convert between binary, octal, decimal, hex and any base from 2 to 36.
Markdown to PDF Converter
Write Markdown, preview live, export a styled PDF — all in your browser.
XPath Tester & Evaluator
Run XPath 1.0 expressions against your XML and see every matching node — live, in your browser.
Chmod Calculator
Tick read, write and execute boxes — get the octal chmod command.
Subnet Calculator
IPv4 address + CIDR or mask → network, broadcast, host range and counts.
REM to PX Converter
Convert rem to pixels instantly — single values, batch lists, and full spacing-scale previews.
Line Height Calculator
Convert line-height across all CSS units, see leading, and check readability.
PX to REM Converter
Convert pixel values to rem — single, bulk, reference table, and reverse lookup.
Text & Writing Tools
Case & Formatting
Title Case Converter
Convert text to proper title case with smart minor-word handling.
Capitalize Each Word
Capitalize the first letter of every word in your text.
Text Column Formatter
Align delimited rows into clean monospace columns.
CSV Column Extractor
Pull selected columns out of any CSV instantly.
Bulk Text to Slug Converter
Turn many titles into URL slugs at once.
Word Wrap Tool
Wrap text to a fixed character width on word boundaries.
Text Case Converter
Convert text between camelCase, snake_case, kebab-case, Title Case and more — live.
Subtitle Converter (SRT, VTT, SBV)
Convert between SRT, WebVTT and SBV, shift timing and fix sync — in your browser.
Fancy Fonts & Social
Upside Down Text Generator
Flip text upside down with Unicode look-alikes.
Zalgo Text Generator
Create glitchy, corrupted Zalgo text you can copy anywhere.
Fancy Unicode Text Generator
Bold, italic, script and more — copy-paste fancy fonts.
Leetspeak Converter
Turn text into 1337 5p34k and back, in your browser.
Unicode Character Inspector
See the code point, hex, and category of every character.
Cursive Text Generator
Turn plain text into Unicode cursive and script styles, then copy.
Italic Text Generator
Turn plain text into italic and bold-italic Unicode you can paste anywhere.
Small Caps Generator
Convert text to Unicode small caps you can paste anywhere.
Upside Down Text Generator
Flip your text 180 degrees with Unicode — copy it anywhere.
Bold Text Generator
Turn plain text into Unicode bold you can paste anywhere.
Bubble Text Generator
Turn any text into circled bubble letters — filled and outline — and copy in one tap.
Fancy Text Generator
Turn plain text into 20+ Unicode font styles and copy each one.
Mirror Text Generator
Flip text backwards and into mirror-image glyphs you can copy and paste.
Superscript & Subscript Generator
Turn any text into Unicode superscript or subscript you can copy and paste anywhere.
Unicode Character Explorer
Paste text and inspect every code point — name, category, hex, HTML entity and UTF-8 bytes.
Wide Text Generator (Vaporwave Fullwidth)
Turn normal text into wide aesthetic fullwidth Unicode and back.
Strikethrough Text Generator
Cross out text with line, slash or wavy strikethrough — copy instantly.
Counters & Analysis
Word & Character Counter
Instant word, character, sentence and reading-time counts as you type.
Count Occurrences
Count how many times a word or pattern appears.
Reading Time Estimator
How long any text takes to read silently and to read aloud.
Line Counter
Count total, non-empty, blank and unique lines.
Text Frequency Analyzer
Count how often each word or character appears.
Syllable Counter
Count syllables in words and text with a per-word breakdown.
Sentence Counter
Count sentences, words and average sentence length instantly.
Social Media Character Counter
Live character count against every social platform limit.
Paragraph Counter
Count paragraphs, sentences and words with averages.
Readability Scorer
Paste text to get Flesch Reading Ease, Flesch-Kincaid grade and full stats.
Word Frequency Counter
Paste text and get a ranked word and phrase frequency table you can export.
Reading Time & Word Counter (Pro)
Live word, character, sentence and paragraph counts with adjustable reading and speaking time.
Clean & Transform
Reverse Text
Reverse characters, words or whole lines instantly.
Sort Lines
Sort lines alphabetically, numerically or by length.
Remove Duplicate Lines
Strip duplicate lines, keeping the first of each.
Find and Replace Text
Bulk find and replace, with optional regex.
Text Repeater
Repeat any text N times with a chosen separator.
Whitespace Cleaner
Trim, collapse and tidy messy whitespace.
Remove Line Breaks
Join hard-wrapped lines back into flowing text.
Extract Emails from Text
Pull every email address out of any text.
Extract URLs from Text
Pull every link out of any text.
Extract Numbers from Text
Pull every number out of any text.
Remove Accents & Diacritics
Strip accent marks to get plain ASCII-friendly text.
Remove Extra Spaces
Collapse repeated spaces and tidy punctuation spacing.
Smart Quotes Converter
Swap between curly typographic quotes and straight quotes.
Duplicate Word Finder
Find words that repeat in your text and how often.
Text Shuffler
Randomly shuffle lines, words or characters with an unbiased shuffle.
Strip HTML Tags
Remove all HTML tags and get clean plain text.
Line Sort & Dedupe Tool
Sort, deduplicate, reverse, shuffle, number and reformat lines of text.
Bulk Find and Replace
Apply many find/replace rules to text at once — literal or regex.
Ciphers & Encoders
ROT13 Converter
Encode and decode ROT13 — the letter-rotating cipher.
Caesar Cipher
Encrypt and decrypt text with a shifting Caesar cipher.
Text to Binary Converter
Convert text into UTF-8 binary, 8 bits per byte.
Binary to Text Converter
Decode binary back into readable UTF-8 text.
Pig Latin Translator
Turn English into Pig Latin instantly, in your browser.
Binary to Emoji Converter
Encode text as playful emoji binary and decode it back.
Phonetic Spelling Generator
Spell names and codes out loud with NATO or police alphabets.
Vigenère Cipher Encoder & Decoder
Encrypt and decrypt text with a keyword-based Vigenère cipher.
Atbash Cipher Encoder & Decoder
Mirror the alphabet — A becomes Z, B becomes Y, all in your browser.
Rail Fence Cipher Encoder & Decoder
Zig-zag transposition cipher with a choice of rails.
Substitution Cipher Encoder & Decoder
Keyword-seeded monoalphabetic substitution, all in your browser.
A1Z26 Cipher Encoder & Decoder
Convert letters to their alphabet position — A=1, Z=26.
ROT13 Encoder & Decoder
Encode or decode ROT13, ROT13+ROT5 and ROT47 instantly — copy in one click.
Binary Text Translator
Convert text to binary and back — plus decimal and hex of every code point.
Caesar Cipher Tool
Encrypt, decrypt and crack Caesar ciphers with any shift.
NATO Phonetic Alphabet Translator
Spell anything out in Alfa, Bravo, Charlie — and decode it back.
Braille Translator
Convert text to Grade-1 Unicode braille and back, in your browser.
Morse Code Translator
Convert text to Morse and decode Morse back to text, with audio playback and a reference chart.
Generators
Lorem Ipsum Generator
Generate placeholder lorem ipsum text by paragraphs, sentences or words.
Fake Data Generator
Generate fake names, emails and addresses as a table, JSON or CSV.
Random Name Generator
Generate realistic random first and last names instantly.
Gamertag Generator
Generate cool gamertags and usernames with optional numbers and leetspeak.
Placeholder Text by Paragraphs
Generate lorem ipsum filler text by paragraph count.
Type Scale Generator
Build a modular typographic scale and copy the CSS.
Markdown Table Generator
Build aligned Markdown tables from a simple grid.
Random Paragraph Generator
Generate random English paragraphs and sentences for testing and layouts.
Lorem Markdown Generator
Generate placeholder Markdown with headings, lists, quotes, code and tables.
Email Signature Generator
Design a professional HTML email signature and copy it straight into Gmail or Outlook.
Markdown Table of Contents Generator
Paste markdown, get a linked table of contents you can copy or insert.
SWOT Analysis Generator
Build a four-quadrant SWOT matrix and export it as PNG, PDF or Markdown.
Themed Lorem Ipsum Generator
Generate placeholder text in 8 themes — classic Latin, hipster, corporate, pirate and more.
More Text Tools
Markdown Editor with Live Preview
Write Markdown on the left, see it render live on the right.
Resume / CV Builder
Fill in a form, watch a clean resume build live, then export to PDF.
Number to Words Converter — Western & Indian (Lakh/Crore) System
Convert any number to English words in Western or Indian (lakh/crore) format instantly.
Palindrome Checker
Check if text reads the same forwards and backwards.
Words to Number Converter
Turn a number written in English words into plain digits.
Number to Words — Indian System (Lakh / Crore)
Spell any number in English using the Indian lakh and crore system.
Number to Words in Spanish (Números en Letras)
Convert any number into Spanish words — correct uno/un, cien, quinientos.
Number to Words in French (Nombres en Lettres)
Convert any number into French words — soixante-dix, quatre-vingts, cent(s).
Number to Words in Portuguese (Números por Extenso)
Convert any number into Portuguese words — cem, cento e, milhão/milhões.
UK Cheque Amount in Words (Pounds & Pence)
Convert a GBP amount into the words to write on a UK cheque.
Indian Cheque Amount in Words (Rupees & Paise)
Convert an INR amount into rupees-in-words for an Indian cheque.
Nigerian Cheque Amount in Words (Naira & Kobo)
Convert an NGN amount into naira-in-words for a Nigerian cheque.
UAE Cheque Amount in Words (Dirhams & Fils)
Convert an AED amount into dirhams-in-words for a UAE cheque.
Words to Number Converter
Convert a number written in English words back into digits.
Add Line Numbers
Prefix every line with a sequential number.
Text Statistics
Counts, sentences, paragraphs and reading time.
Anagram Solver & Checker
Check if two words are anagrams, or list every letter arrangement.
Add Prefix / Suffix to Lines
Add text to the start or end of every line.
Number to Words in Arabic
Convert any number into Modern Standard Arabic words, in your browser.
Number to Words in Armenian
Convert any number into Eastern Armenian words, in your browser.
Number to Words in Georgian
Convert any number into Georgian words — including the base-20 system.
Number to Words in Bengali
Convert any number into Bengali (Bangla) words with lakh and crore.
Number to Words in Urdu
Convert any number into Urdu words with lakh and crore.
Number to Words in Russian
Spell any number in Russian words — instantly, in your browser.
Number to Words in German
Spell any number in German words — instantly, in your browser.
Number to Words in Italian
Spell any number in Italian words — instantly, in your browser.
Number to Words in Turkish
Spell any number in Turkish words — instantly, in your browser.
Number to Words in Chinese
Spell any number in Chinese numerals — instantly, in your browser.
Text to Speech
Read any text aloud in your browser — pick a voice, rate and pitch.
Text to ASCII Art Banner
Turn short text into big block-letter ASCII banners.
Words to Pages Calculator
Convert a word count into an estimated page count.
Reading Level Checker
Flesch–Kincaid grade level and reading ease for any text.
Diff Checker Pro
Compare two texts with line and word-level highlighting, then copy a unified diff.
CSV to Markdown Table
Convert CSV data into a clean Markdown table.
Longest Word Finder
Find the longest words in any block of text.
Scrabble Score Calculator
Add up the tile value of any word instantly.
Words With These Letters
Find every word you can spell from your tiles.
Hangman Word Picker
Pick a fair secret word for a game of hangman.
Word Unscrambler
Turn scrambled letters back into real words.
Basic Rhyme Finder
Find words that rhyme with any common word.
Table to Markdown Converter
Paste TSV, CSV or an HTML table and get a clean Markdown table.
Text to PDF Converter
Paste text or Markdown and download a clean, paginated PDF.
Markdown to Slides
Write a deck in plain Markdown, present it fullscreen, export to PDF.
Flashcard Maker
Build study decks, then flip, shuffle and track what you know.
Markdown Table Editor
Edit tables in a visual grid and get clean GitHub-flavoured Markdown.
Reading Ease Checker
Score any text across 8 readability formulas — instantly in your browser.
Image & PDF Tools
Convert & Compress
HEIC to JPG / PNG / WebP Converter
Convert iPhone HEIC photos to JPG, PNG or WebP — right in your browser.
Image Compressor
Shrink JPG, PNG and WebP images without uploading them.
JPG to PNG Converter
Convert JPG images to lossless PNG — right in your browser, no upload.
PNG to JPG Converter
Convert PNG images to compact JPG — in your browser, with a quality slider.
JPG to WebP Converter
Convert JPG images to smaller WebP — in your browser, with a quality slider.
PNG to WebP Converter
Convert PNG images to smaller WebP — transparency kept, in your browser.
WebP to PNG Converter
Convert WebP images to lossless PNG — transparency kept, in your browser.
WebP to JPG Converter
Convert WebP images to compact JPG — in your browser, with a quality slider.
JPG to AVIF Converter
Convert JPG photos to modern, much smaller AVIF — right in your browser.
PNG to AVIF Converter
Convert PNG images to modern AVIF — smaller files, transparency kept.
GIF to PNG Converter
Convert GIF images to lossless PNG — right in your browser.
BMP to PNG Converter
Convert uncompressed BMP bitmaps to smaller, lossless PNG.
Image to Base64 Data URI
Turn any image into a base64 data URI for HTML, CSS or Markdown.
Image Resize Tool
Resize images to exact pixel dimensions — locally, no upload.
Image to PDF
Turn a JPG, PNG or WebP into a single-page PDF — no upload.
PNG to ICO Converter
Turn a PNG into a multi-size Windows .ico favicon — in your browser.
JPG to ICO Converter
Turn a JPG into a multi-size Windows .ico icon — in your browser.
SVG to PNG Converter
Rasterise SVG vector files to crisp PNG at any size — in your browser.
SVG to JPG Converter
Rasterise SVG vector files to compact JPG at any size — in your browser.
GIF to WebP Converter
Convert GIF images to smaller WebP — in your browser, with a quality slider.
AVIF to JPG Converter
Convert modern AVIF images to widely-compatible JPG — in your browser.
HEIC to PNG Converter
Convert iPhone HEIC photos to lossless PNG — right in your browser.
HEIC to WebP Converter
Convert iPhone HEIC photos to compact WebP — right in your browser.
WebP to GIF Converter
Convert WebP images to GIF — entirely in your browser, no upload.
TIFF to JPG Converter
Convert TIFF images to JPG — decoded and encoded in your browser.
AVIF to PNG Converter
Convert AVIF images to lossless PNG — transparency kept, in your browser.
Compress Image to Target Size
Shrink a photo to a target file size, e.g. under 200 KB.
PDF to Images Converter
Render every PDF page to a PNG or JPG and download them in one click.
Images to PDF Converter
Combine many photos or scans into one PDF — reorder, set page size and margins.
Compress PDF
Shrink a PDF in your browser — see the before and after size, then download.
Batch Image Converter
Convert many images to WebP, JPG or PNG at once and download a single zip.
Batch Image Resizer
Resize many images at once and download them all as a ZIP.
Image to ASCII Art Converter
Turn any photo into monospace ASCII art — copy, download as text or PNG.
SVG to PNG Converter (Batch, Scale & Transparent)
Rasterise one or many SVG files to crisp PNG at any scale or exact size.
Image Format Converter
Convert PNG, JPG and WebP both ways with a quality slider and batch zip download.
Edit
Image Crop Tool
Crop JPG, PNG and WebP images in your browser — no upload.
Rotate & Flip Image
Rotate and mirror images in 90° steps — privately, no upload.
Image Watermark Adder
Add a text watermark to photos — right in your browser.
Blur & Redact Image
Blur or black-box sensitive parts of an image privately.
Photo Border Adder
Add a clean solid-color border around any photo.
Sepia Photo Filter
Give any photo a warm vintage sepia tone with adjustable intensity.
Image Editor
Crop, rotate, adjust, filter and add text to images — all in your browser.
SVG Optimizer & Editor
Paste an SVG, minify it, inspect its dimensions, then copy or download the optimized file.
PDF Redactor
Draw black boxes over a PDF and flatten the hidden text away — in your browser.
Image Border & Frame Maker
Add a solid or gradient border, rounded corners and a drop shadow, then export a PNG.
Image Rounded Corners and Shadow Tool
Round corners, add a drop shadow and export a transparent PNG.
Image Redactor
Draw blur, pixelate or black boxes over sensitive parts of an image and export it.
Image Duotone Maker
Turn any photo into a two-colour duotone and export a high-res PNG.
CSS Filter Playground
Tune blur, brightness, contrast, saturate, hue and more on a live image — then copy the CSS.
Image Crop & Straighten
Crop to any selection and straighten a tilted photo by fine degrees, then export.
PDF Tools
Split PDF & Extract Pages
Pick page ranges, click thumbnails, and export selected pages — no upload.
PDF Page Organizer
Reorder, rotate, duplicate and delete PDF pages with drag-and-drop thumbnails.
Extract Images from PDF
Pull every embedded photo, logo and figure out of a PDF and save them as a ZIP.
PDF Page Reorder Tool
Drag pages into a new order and download a rearranged PDF.
PDF Page Extractor
Pick a page range and save just those pages as a brand-new PDF.
Makers & Generators
Code 128 Barcode Generator
Create scannable Code 128 barcodes from text or numbers in your browser.
Random Color Generator
Generate random colors with HEX, RGB and HSL values.
QR Code Generator with Logo
Make a branded QR code with your logo in the centre, custom colours and a high-resolution PNG download.
OG / Social Image Maker
Design a 1200×630 social share image and export a crisp PNG.
Business Card Designer
Design a two-sided business card and export print-ready PNG and PDF.
Letterhead Maker
Design a company letterhead and export a print-ready PNG header and PDF page.
Passport & ID Photo Maker
Crop your photo to any country size and export a ready-to-print sheet.
Photo Collage Maker
Combine your photos into a grid collage and export a high-res PNG.
Quote Image Maker
Turn any quote into a share-ready square and story poster.
Batch QR Code Generator
Turn a list of notes or links into many QR codes at once.
Certificate Maker
Design a printable certificate and export it as PNG or PDF.
Meme Maker Pro
Add top, bottom and custom captions to any image, then export a PNG.
YouTube Thumbnail Maker
Design a 1280x720 YouTube thumbnail and export it as a PNG.
Sprite Sheet Maker
Drop frames, arrange them in a grid and export a sheet PNG plus a JSON atlas.
Device Mockup Generator
Drop a screenshot into a phone, tablet, laptop or browser frame and export a PNG.
Receipt Maker
Build an itemised sales receipt and export it as PNG or PDF.
Screenshot Beautifier
Drop a screenshot, add a gradient background, padding, rounded corners and a shadow, then export a polished PNG.
Coupon & Voucher Maker
Design a branded discount coupon and export it as a PNG.
ID & Membership Card Maker
Design a front-and-back ID card, add a photo, export PNG and a print-ready PDF sheet.
Seating Chart Maker
Lay out tables, assign every guest to a seat, and export a clean PNG.
ASCII Art Generator
Turn any image into copy-and-paste ASCII text art.
Meme Generator
Upload an image, add classic outlined top and bottom captions, export a PNG.
Contact Sheet Maker
Turn many photos into one printable thumbnail grid with filenames, then export PNG.
Animated GIF Maker
Turn a sequence of images into one looping animated GIF.
Batch QR Code Generator
Paste a list or CSV and download one QR code per row as a single zip.
Sprite Sheet Slicer
Upload a sprite sheet, set rows and columns or a cell size, and export every frame as a ZIP.
Graph Paper Generator
Make printable square, dot, isometric, hex or log paper and export a vector PDF.
Nonogram Generator (Picross / Hanjie Puzzles)
Generate logic-solvable nonogram puzzles and print them with an answer key.
SVG Wave Generator
Build layered animated or static SVG wave dividers and export the markup.
SVG Blob Generator
Create random organic blob shapes and download them as SVG or PNG.
Material Palette Generator
Turn one base colour into a full 50–900 palette with tints, shades and tones.
Color from Image
Color Picker from Image
Click any pixel to grab its HEX and RGB color.
Invert Image Colors
Create a photographic negative by inverting an image's colours.
Color Contrast Grid
Paste a palette and see every text/background pair scored against WCAG AA and AAA.
Image Color Extractor
Pull the dominant colour palette and hex codes out of any image.
Color Name Finder
Find the nearest named CSS colour, plus complementary and harmony shades.
Image Color Blindness Simulator
Upload a photo or design and preview it under protanopia, deuteranopia and tritanopia.
Color Palette Extractor
Pull the dominant colors out of any image — with hex, RGB, HSL and exports.
More Image Tools
EXIF Viewer & Metadata Stripper — See & Remove Hidden Photo Data
Read camera, date and GPS data buried in your photo — then strip it before sharing.
Image to Grayscale
Convert images to black & white or sepia — privately, no upload.
Flip & Mirror Image
Mirror a photo horizontally or vertically instantly.
Base64 to Image
Decode a Base64 string or data URI back into a viewable image.
Image to Grayscale / Black & White
Convert any photo to greyscale or pure 1-bit black and white.
Brightness & Contrast Adjuster
Fine-tune any photo's brightness and contrast with live sliders.
Aspect Ratio Calculator
Find a ratio and scale dimensions while keeping it locked.
Screen Resolution Checker
See your screen resolution, pixel ratio and aspect ratio live.
DPI / PPI Calculator
Pixel density from resolution and diagonal screen size.
Image Dimension Scaler
Resize image dimensions by percent or target size, ratio locked.
Viewport Size Checker
Live browser viewport size, breakpoint and scrollbar width.
EXIF Remover (Batch)
Strip EXIF, GPS and all hidden metadata from many photos at once, then download a ZIP.
Instagram Grid Splitter
Split one image into a perfectly aligned 3x3 or 1x3 Instagram feed and download a ZIP of tiles.
Document Scanner
Turn a phone photo of a document into a clean, high-contrast scan and export a PDF.
EXIF Metadata Stripper
Remove EXIF, GPS and camera metadata from a photo — entirely in your browser.
Everyday & Quick-Help Apps
Trackers & Planners
Time Zone Meeting Planner
Pick a meeting time in one zone and see it across cities worldwide.
Keyboard Shortcuts Reference
Essential macOS and Windows keyboard shortcuts, side by side and searchable.
Initiative Tracker
Track combat turn order and HP for tabletop RPG encounters.
Kanban Board
A drag-and-drop task board that saves to your browser — no account, no sync.
Habit Tracker
Build streaks with a weekly and monthly grid that saves in your browser.
Name Numerology Calculator
Find the numerology numbers hidden in your name.
Reading List Tracker
Track books with status, star ratings, page progress and notes — export anytime.
Eisenhower Matrix
Sort tasks into do, schedule, delegate or delete.
Time Blocking Planner
Build a back-to-back schedule of focused time blocks.
Weekly Goal Tracker
Track progress toward your weekly targets with live bars.
Focus Session Logger
Log focus sessions with duration and a quality rating.
Keyboard Symbols Reference
What ⌘ ⌥ ⇧ ⌃ and the other key symbols mean.
Roman Numerals Chart
Convert numbers to Roman numerals, plus a full chart.
Content Calendar Planner
Plan a month of posts across every channel and export to CSV.
Mood Tracker & Daily Journal
Log your daily mood and notes, then see streaks and a monthly heatmap.
OKR Tracker
Track objectives and measurable key results with quarterly progress.
Packing List Builder
Build a reusable travel checklist with categories, quantities and ready-made templates.
Chore Chart Maker
Build a weekly household chore chart with points, checkboxes and a leaderboard.
Gift List Tracker
Plan presents per person, track status and stay inside every budget.
Meeting Agenda Builder
Plan a timed meeting agenda with owners, running times and a one-click PDF.
Pros and Cons List Maker
Weigh each pro and con, compare options and get a clear verdict.
Packing List Maker
Build a categorised packing checklist, tick off items and track progress.
Travel Itinerary Builder
Plan a trip day by day, reorder activities and export a clean PDF.
Timers
Online Timer, Stopwatch & Pomodoro
A countdown timer, stopwatch and Pomodoro focus timer in one tab.
Pomodoro Timer
Run 25/5 focus cycles with automatic breaks and a session counter.
Online Stopwatch
Start, stop and lap an accurate stopwatch with hundredths of a second.
Countdown to Date
Live countdown of days, hours, minutes and seconds to any date and time.
Box Breathing Timer
A guided 4-4-4-4 breathing timer with an animated visual pacer.
Stopwatch with Lap Timer
An accurate online stopwatch that records lap and split times.
Interval Timer (HIIT)
Work / rest interval timer for HIIT, Tabata and circuits — with audio cues.
HIIT Interval Timer
Build work/rest rounds and sets, then run a big countdown with audio cues.
Generators & Pickers
QR Code Generator
Create custom QR codes for URLs, text and more — download as PNG or SVG.
Password Generator
Secure passwords and passphrases — generated entirely in your browser.
WiFi QR Code Generator
Make a QR code that connects guests to your WiFi in one scan.
vCard QR Code Generator
Turn your contact details into a scannable digital business card.
Calendar Event QR Code Generator
Let people add your event to their calendar with one scan.
Geo Location QR Code Generator
Encode coordinates into a QR code that opens in any maps app.
Email QR Code Generator
Make a QR code that opens a prefilled email in one scan.
SMS QR Code Generator
Make a QR code that opens a prefilled text message in one scan.
Random Number Generator
Cryptographically strong random numbers in any range.
Dice Roller
Roll d4 to d100 with modifiers — fair and instant.
Random Team Picker
Split a list of names into fair, balanced teams.
Lottery Number Picker
Generate lucky lottery numbers for any draw format.
Random Card Draw
Draw playing cards from a fair, shuffled deck.
Crypto Address QR Code Generator
Turn a wallet address into a scannable QR code for fast payments.
Phone Number QR Code Generator
Make a QR code that dials a number with one scan.
App Link QR Code Generator
Turn an App Store or Play Store link into a scannable QR code.
PayPal.Me QR Code Generator
Make a QR code that opens your PayPal.Me payment page.
Secret Santa Picker
Draw fair Secret Santa pairings where nobody gets themselves.
Wheel of Names Spinner
Spin a colourful wheel to pick a random name or option.
Random Quote Generator
Get a random inspirational quote with one click.
White Noise Generator
Play white, pink or brown noise — synthesised locally for focus or sleep.
Random Fact Generator
One tap for a surprising, true "did you know?" fact.
Would You Rather Picker
Endless "would you rather" dilemmas for any group.
Business Card QR Code Generator
Turn your contact details into a scannable vCard QR code for your card.
Spotify Link QR Code Generator
Make a scannable QR code for any Spotify track, album or playlist.
YouTube Link QR Code Generator
Create a scannable QR code for any YouTube video, playlist or channel.
Instagram QR Code Generator
Make a scannable QR code for your Instagram profile, post or reel.
WhatsApp Click-to-Chat QR Code Generator
Make a QR code that opens a WhatsApp chat with a prefilled message.
D&D Dice Roller
Roll dice notation like 2d6+3 or 4d6kh3 — fair and instant.
RPG Loot Generator
Roll treasure hoards — coins, gems and magic items by tier.
Fantasy Name Generator
Generate fantasy names for elves, dwarves, orcs and more.
Random Emoji Picker
Pick random emoji by category — with a no-repeats option.
Bingo Card Generator
Print random 75-ball bingo cards — B, I, N, G, O.
Sudoku Generator
Generate unique-solution sudoku puzzles — easy, medium, hard.
Maze Generator
Create printable mazes with one solution path — small to large.
Word Search Generator
Hide your own words in a printable word search grid.
Lucky Number Generator
Pick lucky numbers for any range — lottery, draws or games.
Decision Spinner
Can''t decide? Add your options and let the spinner choose.
Random Team Name Generator
Punchy two-word team names for sports, quizzes, gaming and work.
Tournament Bracket Generator
Build a single-elimination bracket, seed or shuffle, and crown a champion.
Tournament Bracket Generator
Build a seeded single-elimination bracket, record scores and export to PDF or SVG.
Reference
Guitar Tuning Reference
String-by-string note names and frequencies for common guitar tunings.
Zodiac Signs Reference
All 12 zodiac signs with dates, elements, qualities and ruling planets.
Currency Symbols Reference
Currency symbols with ISO codes, names and countries — searchable.
Planetary Data Reference
Diameter, mass, gravity, orbit and moons for every planet.
Greek Alphabet Reference
All 24 Greek letters with names, pronunciation and uses.
Metric Prefixes Reference
Every SI prefix from quetta to quecto, with powers of ten.
More Apps
Coin Flip
Flip one or many coins — fair heads or tails.
Online Metronome
A clickable metronome from 20 to 300 BPM with accented downbeats.
Password Strength Tester
Check how strong a password really is — entropy, crack time and fixes.
World Clock — Multiple Cities
See the current time across multiple cities and time zones at once.
Online Alarm Clock
Set an alarm in your browser — the tone is generated locally, no app needed.
World Clock — Multiple Time Zones
Compare the current time across any IANA time zones, side by side.
NATO Phonetic Alphabet Converter
Spell any word or code in the NATO phonetic alphabet.
Magic 8 Ball
Ask a question, shake the ball, get one of 20 classic answers.
Love Compatibility Calculator
Enter two names for a just-for-fun compatibility score.
Yes or No Oracle
Ask anything and get a clear Yes, No, or Maybe.
Tap Tempo
Tap along to any beat to find its tempo in BPM.
Character Stat Roller
Roll D&D ability scores — 4d6 drop lowest, with modifiers.
Birthstones by Month
Modern and traditional birthstones for every month, with meanings.
Anniversary Gifts by Year
Traditional and modern wedding anniversary gifts for each year.
Crossword Grid Maker
Design a blank crossword grid with auto clue numbering.
Rock Paper Scissors
Play rock paper scissors against the computer — fair and instant.
Fortune Cookie
Crack a virtual fortune cookie for a message and lucky numbers.
Coin Flip Streak Simulator
Flip many coins at once and see the longest run of heads or tails.
ICS Calendar Event Builder
Build a real .ics calendar file and add events to Google or Outlook in one click.
vCard Builder — Create a .vcf Contact File and QR Code
Build a full vCard, download the .vcf, and get a scannable contact QR.
Recipe Manager
Save recipes, scale servings and build a tidy shopping list — all offline.