MPG ↔ L/100km Converter

Convert fuel economy between MPG (US & UK), L/100km and km/L.

Result updates as you type.

How it works

1

Enter a value

Type the figure you have.

2

Pick its unit

L/100km, US MPG, UK (imperial) MPG or km/L.

3

Read all units

Every other unit is shown instantly — US and UK gallons differ, so the two MPG figures are not the same.

Frequently asked questions

How do I convert MPG to L/100km?

L/100km = 235.215 ÷ US MPG (or 282.481 ÷ UK MPG). They are inversely related, so a higher MPG means a lower L/100km.

Why are US and UK MPG different?

The imperial (UK) gallon is about 20% larger than the US gallon, so the same car shows a higher number in UK MPG than US MPG.

What is km/L?

Kilometres per litre, used in some markets. km/L = 100 ÷ L/100km.

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