Convert fuel economy between MPG (US/UK), L/100km and km/L.
Converted instantly in your browser.
How do you convert MPG to L/100km?
L/100km = 235.215 ÷ MPG(US) = 282.481 ÷ MPG(UK) = 100 ÷ (km/L). MPG and km/L are "higher is better", while L/100km is "lower is better", which can confuse cross-region comparisons. For example, 30 MPG (US) is about 7.84 L/100km, 36 MPG (UK) or 12.75 km/L. Lower L/100km means better efficiency.
Understanding your result
MPG and km/L are “higher is better”, while L/100km is “lower is better”, which can be confusing when comparing across regions.
Formula and method
L/100km = 235.215 ÷ MPG(US) = 282.481 ÷ MPG(UK) = 100 ÷ (km/L). Lower L/100km means better efficiency.
Worked example
30 MPG (US) is about 7.84 L/100km, 36 MPG (UK) or 12.75 km/L.
How to use this tool
- Enter the value and the unit it’s in.
- Choose the unit to convert to.
- Press Convert.
About the Fuel Economy Converter
The Fuel Economy Converter switches between MPG (US and UK), litres per 100 km and kilometres per litre so you can compare cars from any market.
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Frequently asked questions
Why are US and UK MPG different?
A UK (imperial) gallon is larger than a US gallon, so the same car shows a higher MPG figure in the UK than in the US.