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Fuel Economy Converter

Convert fuel economy instantly, swap units and compare every result.

● Live results · Runs on your device · No sign-up

Your inputs

US and UK gallons differ. Consumption and economy use reciprocal formulas.

Live results

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Result visualization

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Fuel Economy Converter guide

Convert fuel economy instantly, swap units and compare every result.

How to use this tool

  1. Enter the value you want to convert.
  2. Choose the source and destination units. Use Swap to reverse them.
  3. Compare the live equivalents, then copy a result or download the table as CSV.

A worked example

5 litres/100 km is 20 kilometres/litre. US and UK MPG give different numbers because their gallons differ.

How it works

Consumption and economy are reciprocal: kilometres/litre = 100 ÷ litres/100 km. MPG uses the selected gallon definition.

Frequently asked questions

Which unit definitions are used?

Litres/100 km, Kilometres/litre, MPG (US), MPG (UK). Read the labels carefully: regional or decimal/binary variants are separate choices.

Why can two converters show slightly different last digits?

Rounding and the selected unit definition can differ. Keep extra precision until the final reporting step.