What is CPC and how is it calculated?

CPC stands for Cost Per Click. It is calculated as: CPC = total ad spend ÷ total clicks. For example, spending £500 to receive 250 clicks gives a CPC of £2.00. It measures how much you pay every time someone clicks your ad.

What is a good CPC for Google Ads?

There is no universal "good" CPC — it varies wildly by industry, keyword, and geography. B2C e-commerce CPCs often sit between $0.50–$2.00, while competitive B2B or legal keywords can exceed $50. What matters is whether your CPC is below your revenue per click. Use the ROAS and profit figures in this calculator to judge efficiency rather than comparing raw CPC in isolation.

What is the difference between CPC, CPM, and CPA?

CPC (Cost Per Click) is what you pay each time someone clicks your ad. CPM (Cost Per Mille) is the cost per 1,000 impressions — useful for awareness campaigns where reach matters. CPA (Cost Per Acquisition) is the spend divided by the number of conversions, showing the cost to acquire one customer or lead. All three are shown by this calculator from the same inputs.

What does ROAS mean and what is a good ROAS?

ROAS stands for Return On Ad Spend. It equals (total conversion value) ÷ (ad spend). A ROAS of 4× means you earn £4 in revenue for every £1 spent. A ROAS below 1× means the campaign is unprofitable at the revenue level entered. Many e-commerce businesses target 3–5× ROAS, but the break-even ROAS depends on your gross margins: if margin is 25%, you need at least 4× ROAS to cover the spend. Enter your margin-adjusted value per conversion to get the most accurate reading.

How do I use the solver modes (CPC / Spend / Clicks)?

Toggle the three buttons at the top to choose what to solve for. In CPC mode you enter spend and clicks and the calculator tells you the CPC. In Spend mode you enter a target CPC and click volume and it returns the required budget. In Clicks mode you enter a CPC and a budget and it returns how many clicks you can expect — useful for forecasting before a campaign launches.

What is CTR and how does it affect CPC?

CTR (Click-Through Rate) equals (clicks ÷ impressions) × 100. A higher CTR improves your Google Quality Score, which can lower your actual CPC even at the same bid, because Google rewards relevance. Improving ad copy or targeting to raise CTR is often the fastest way to reduce effective CPC without cutting bids.

CPC Calculator — Cost Per Click, CTR, ROAS & CPA

A CPC (Cost Per Click) calculator that goes beyond a single formula — it computes CPC, CTR, CPM, CPA, ROAS and net profit from your ad campaign numbers in one place. Whether you are running Google Search Ads, Facebook Ads, LinkedIn Ads, or any other paid channel, the same four inputs power a complete picture of campaign efficiency.

How it works

The calculator is built around the CPC triangle: any two of ad spend, clicks, and CPC determine the third. Switch the “Solve for” toggle to pick whichever value you want as the output — then fill in the remaining two as inputs. This is useful both for analysing a live campaign (enter real spend and clicks → read CPC) and for planning a new one (enter target CPC and budget → read expected click volume).

The full set of formulas used:

CPC = spend ÷ clicks

CTR (%) = (clicks ÷ impressions) × 100

CPM = (spend ÷ impressions) × 1,000

CPA = spend ÷ conversions

Conv. rate (%) = (conversions ÷ clicks) × 100

ROAS = (conversions × value per conversion) ÷ spend

Profit = (conversions × value per conversion) − spend

The optional “Value per Conversion” input lets you set margin-adjusted revenue so that ROAS and profit reflect real profitability rather than gross revenue. Leave it at zero if you only care about click metrics.

Worked example

A Google Search campaign runs for one week with these figures from the dashboard:

Ad spend: $500
Clicks: 250
Impressions: 12,000
Conversions: 18
Average order value: $65

Plugging these in:

Metric	Calculation	Result
CPC	$500 ÷ 250	$2.00
CTR	(250 ÷ 12,000) × 100	2.08%
CPM	($500 ÷ 12,000) × 1,000	$41.67
CPA	$500 ÷ 18	$27.78
Conv. rate	(18 ÷ 250) × 100	7.20%
ROAS	(18 × $65) ÷ $500	2.34×
Profit	(18 × $65) − $500	+$670

A ROAS of 2.34× with a $65 average order might be acceptable for a high-margin product but unprofitable for a low-margin one. Swap the value per conversion for your gross profit per order (e.g. $30 on a $65 sale) to see the true picture: ROAS drops to 1.08× and profit collapses to $40 — barely covering the spend.

Understanding the CPC rating

The calculator labels your CPC as Very Low, Low, Moderate, High, or Very High based on USD benchmarks adapted for GBP and EUR. These are rough industry anchors only. A $10 CPC for a B2B SaaS keyword with a $5,000 lifetime customer value is excellent; the same $10 CPC for a $15 retail product is catastrophic. Always contextualise CPC against your revenue per click, not against an industry average.

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