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Fuel Economy Converter

Convert fuel economy between US MPG, UK MPG, L/100km and km/L at once.

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About this tool

Enter a fuel economy figure in any common unit and see the equivalent in all four units, computed entirely in your browser.

Why does L/100km behave differently?

L/100km measures consumption, so it is inversely related to MPG and km/L — a lower L/100km means a more efficient vehicle.

What is the difference between US and UK MPG?

They use different gallons: a US gallon is about 3.785 litres while an imperial UK gallon is about 4.546 litres, so UK MPG numbers run higher.