Fuel Economy Converter
Convert fuel economy between miles per gallon (US and imperial), litres per 100 km and kilometres per litre.
Result
Result
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Enter a fuel economy figure greater than zero.
Enter a fuel economy figure and choose the units. Note that US and imperial gallons differ, and that L/100km is inverse to mpg — a lower L/100km means better economy, while a higher mpg is better.
Frequently asked questions
How do I convert mpg to L/100km?
Divide a constant by the mpg figure: 235.21 for US gallons, or 282.48 for imperial gallons. For example, 40 US mpg = 235.21 ÷ 40 ≈ 5.88 L/100km.
Why is a lower L/100km better but a higher mpg better?
They measure opposite things. Miles per gallon is distance per fuel, so more is better. Litres per 100 km is fuel per distance, so less is better. They're reciprocals of each other.