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Fuel Economy Calculator

Fuel consumption in L/100 km, km/L, and miles per gallon.

Distance driven

Fuel used

How it works

Consumption (L/100 km) = fuel used ÷ distance × 100. US mpg = 235.215 ÷ L/100 km and UK mpg = 282.481 ÷ L/100 km, because the US and UK gallons differ in size. Fill the tank to the same level each time for the most accurate reading. Example: with the default values, 36 L over 450 km is 8.0 L/100 km, or 29.4 US mpg.

FAQ

Is this calculator free?

Yes. No signup is needed and nothing you enter is stored.

Is the result exact?

Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.

Do my numbers leave my device?

No. The calculation runs in your browser.