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Mileage calculator (MPG and km/L)

Enter a fill-up log or one refill-to-full trip and read your true fuel economy in km/L, L/100 km, US MPG, and UK MPG with cost per distance.

Paste a fill-up log to read your true economy.

A log only tells the truth between full tanks. Fuel added on a partial fill-up is still counted, but a span only starts and ends where you marked the tank full, because the leftover fuel in the tank is unknown anywhere else. The cost lines come from the price column at the pump, not from any live fuel price. If your car reports its own figure, compare it after a few tanks: onboard economy readouts tend to flatter.

Fill-up book

Mode

Distance in

Fuel in

Currency symbolUp to 4 characters

Fill-up logodometer, fuel, price, full, date. One fill-up per line, up to 2000. Price onward optional; blank lines are skipped.

More settings

The full column takes yes, y, full, true, 1 and no, n, partial, false, 0. An empty full column reads as a full tank. Log lines cap at 200 characters and every number at ±1,000,000,000.

Keep US and UK gallons straight: a UK gallon is 4.54609 litres, a US one only 3.785411784, and mixing them shifts the MPG by about a fifth. The tool keeps them separate everywhere.

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Mileage calculator (MPG and km/L)

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