Fuel Economy Converter

Convert fuel economy between miles per gallon (US and UK), litres per 100 km, kilometres per litre, and miles per litre. Type a value in any unit and see the equivalents in all the others. Conversions use the exact definitions (1 mile = 1.609344 km, 1 US gallon = 3.785411784 L, 1 UK gallon = 4.54609 L) routed through a kilometres-per-litre pivot, so every unit stays consistent and round-trips exactly. Everything runs locally in your browser.

Enter a value in

Value

Equivalents

Lower L/100km is better; higher MPG, km/L and mi/L are better. UK gallons are larger than US gallons, so the same car shows more MPG in the UK.