MPG to Kilometres Per Litre Converter
Convert miles per gallon to kilometres per litre. Choose whether your MPG figure uses UK (Imperial) or US gallons — the result differs because the two gallons hold different amounts of fuel.
Converting MPG to km/L combines two steps: miles to kilometres (× 1.609344) and gallons to litres. Because a UK gallon (4.54609 L) is larger than a US gallon (3.785411784 L), the factor differs.
How to convert MPG to km/L
MPG to km/L conversion table
Frequently asked questions
How do I convert MPG to km/L?
Multiply the MPG value by a factor that depends on the gallon. For UK (Imperial) MPG the factor is 0.354006, and for US MPG it is 0.425144. So 40 UK MPG ≈ 14.16 km/L, while 40 US MPG ≈ 17.01 km/L.
Why do UK and US MPG give different km/L values?
An Imperial (UK) gallon is 4.54609 litres, while a US gallon is only 3.785411784 litres. Because the US gallon is smaller, the same MPG number represents less fuel, so a US MPG figure converts to a higher km/L than the same UK MPG figure.
Which gallon should I use?
Use UK / Imperial MPG if your figure comes from the UK, Ireland, India or another country that uses Imperial gallons. Use US MPG if your figure comes from the United States. The calculator lets you switch between the two.
Is a higher km/L or MPG better?
Yes — for both km/L and MPG, a higher number means you travel further on the same amount of fuel, so the vehicle is more efficient. Just never compare a UK MPG figure directly with a US MPG figure.
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