Fuel Economy Converter (MPG, L/100km)

Convert fuel consumption between mpg (US and UK), litres per 100 km, km per litre and miles per litre.

How do I convert MPG to L/100km?

Divide 235.215 by US mpg to get litres per 100 km (282.481 for UK mpg). 30 US mpg ≈ 7.84 L/100 km. Because one is distance per fuel and the other fuel per distance, the conversion is not linear.

Reference

US mpg	UK mpg	L/100 km	km/L
20	24	11.8	8.5
30	36	7.8	12.8
40	48	5.9	17
50	60	4.7	21.3

Lower L/100 km is better; higher mpg or km/L is better.

Frequently asked questions

Why is UK mpg higher than US mpg?

A UK gallon is 4.546 litres, about 20 % more than a US gallon (3.785 l).

Which countries use L/100 km?

Most of Europe, Canada, Australia and many others; km/L is common in Asia and Latin America.

What about electric cars?

EVs use kWh per 100 km or miles per kWh instead.