Gas Mileage Calculator
Compute fuel efficiency from distance and fuel used.
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Frequently asked questions
Miles + US gallons or kilometres + litres. The calculator converts between the two using standard factors (1 mile = 1.609344 km, 1 US gallon = 3.785411784 L), so you can switch units after entering data.
They are inverses of each other (distance per fuel vs fuel per distance), so high MPG corresponds to low L/100 km. The calculator shows both for direct comparison.
No. It only divides the distance you entered by the fuel you entered. Real-world conditions like terrain, weather, and driving style affect actual efficiency.
Last updated 2026-06-03.