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Fuel Economy Converter

Convert between US MPG, UK MPG, litres per 100 km and kilometres per litre. Nothing leaves your browser.

Unit of your number

Result

How it works

Pick which unit your number is in. 1 US gallon = 3.785411784 litres, 1 UK gallon = 4.54609 litres and 1 mile = 1.609344 km. L/100km = gallon litres × 100 ÷ (MPG × 1.609344).

FAQ

How do I convert MPG to L/100km?

Divide 235.215 by the US MPG figure. For example 30 US MPG is about 7.84 L/100 km.

Why are US and UK MPG different?

The UK (imperial) gallon is 4.54609 litres and the US gallon is 3.785 litres, so the same car has a higher UK MPG number.

Is a lower L/100km better?

Yes. L/100 km is fuel used per distance, so lower means more efficient. MPG is the reverse.

What is km/L?

Kilometres travelled per litre of fuel, common in some countries. It equals 100 divided by L/100 km.

Is my data uploaded?

No. Everything is calculated in your browser and nothing is sent or stored.

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