Fuel Efficiency Converter
Convert between km/L, US mpg, UK mpg and L/100 km — including the inverse L/100 km scale used in Europe.
How to use
- 1Enter a fuel economy figure and its unit.
- 2Choose the unit to convert to.
How it's calculated
Converts through km per liter. L/100 km is inverse: km/L = 100 ÷ (L/100 km). 1 US mpg = 0.4251 km/L; 1 UK mpg = 0.3540 km/L.
Frequently asked questions
Why is L/100 km 'backwards'?
It measures fuel used over a distance, so lower is better. mpg and km/L measure distance per fuel, so higher is better.
How do I turn L/100 km into US mpg?
Divide 235.215 by the L/100 km figure. 8 L/100 km ≈ 29.4 US mpg.
Why do UK and US mpg differ?
A UK gallon is about 20% bigger than a US gallon, so the same car shows a higher mpg in the UK.