A road trip cost splitter that turns a real multi-stop journey into one fair bill. Most fuel calculators stop at a single distance and a single answer; a real trip has several legs, a toll here, parking there, maybe a ferry, and a car full of people who paid different amounts at different pumps. This tool models all of that. You build the route leg by leg, set your vehicle once, add whoever is travelling, and it produces both the total cost of the trip and a clean settle-up plan showing exactly who pays whom — in the fewest transfers — so nobody has to do napkin maths at the end of the weekend.
It is built for the everyday situations where splitting fairly gets awkward: three friends driving to a festival where one filled the tank and another paid the campsite toll, a family weekend with a return leg that should count twice, or a group where two people share one seat and reasonably owe a bigger share than the solo driver. Because it is fully client-side, you can edit numbers live, watch the per-person net flip between owing and being owed, and there is no signup, no upload, and no limit on legs or passengers.
How it works
Pick imperial (miles and mpg) or metric (kilometres and litres per 100 km) to match your dashboard. Enter the car’s economy and the pump price once, then tick return trip if you are coming home the same way — every distance is doubled automatically. Each route leg is one row: a label, its distance, and any tolls, parking or other charges that belong to that stretch. Fuel cost per leg is distance converted to gallons or litres at your economy, multiplied by your price; the other charges are added on top.
All the legs roll up into a grand total. Each traveller owes a portion of that total according to their shares weight, and their net is simply what they paid minus what they owe. From those balances the splitter runs a greedy settlement that matches the biggest debtor to the biggest creditor until everyone reaches zero — the minimal-transfer result you would want if you were settling by bank transfer. Hit Download PDF for a shareable receipt or CSV to drop the numbers into a spreadsheet.
Example
A return weekend trip in a 40 mpg car with petrol at £6.50 per gallon. Leg one is 180 miles with £12 parking; leg two is 65 miles with a £4 toll. With the return trip doubling distances, the car covers 490 miles, burns about 12.3 gallons, and fuel works out near £80. Add £32 of doubled tolls and parking and the grand total is roughly £112. Split three ways that is about £37 each. If Alex already paid £80 up front, the settle-up plan tells Sam and Jordan to send Alex roughly £37 each — squaring the trip in two transfers instead of a confusing pile of IOUs.
| Item | One-way | Return |
|---|---|---|
| Distance | 245 mi | 490 mi |
| Fuel used | ~6.1 gal | ~12.3 gal |
| Fuel cost | ~£40 | ~£80 |
| Tolls + parking | £16 | £32 |
| Grand total | ~£56 | ~£112 |
Every figure is calculated in your browser — no distances, prices or names are uploaded or stored anywhere but this device.