Fuel Cost Calculator
How it works
Fuel needed is distance divided by efficiency; cost is that fuel at your price. The care goes into the units. Kilometres per litre and litres per 100 km run in opposite directions — a bigger number is a better car in the first and a worse one in the second — and the US gallon (3.785 L) is smaller than the UK one (4.546 L), so the same MPG figure describes two different cars depending on which is meant.
Because of that, the fuel price is taken in the unit your efficiency figure implies rather than as a separate choice: metric units are priced per litre, MPG per gallon of the matching kind. Mismatching those is the easiest way to get an answer that looks right and is not.
Frequently asked questions
Which efficiency unit should I use?
Whichever your car reports. They are not interchangeable: km per litre and litres per 100 km run in opposite directions, and a US gallon is smaller than a UK one, so 25 MPG (US) and 25 MPG (UK) are different cars.
What is the fuel price per?
Per the unit your efficiency figure implies — a litre for the metric units, a US or UK gallon for the two MPG ones. The label on the price field says which, and it changes with the unit.
Does this include tolls, parking or wear?
No — fuel only. It is the part that scales with distance; the rest depends on the route and the vehicle in ways a calculator cannot guess.