Fuel Consumption Converter

Runs locally in your browser. Nothing leaves your device.

Instantly convert fuel consumption between L/100 km, km/L, US MPG, Imperial MPG, and other international units.

Use a comma or period as the decimal separator; do not use thousands separators.

All units

Consumption per distance

Millilitres per kilometre (mL/km)
70
Litres per 100 miles (L/100 mi)
11.2654
Litres per 100 kilometres (L/100 km)
From
7
US gallons per 100 miles (US gal/100 mi)
2.97601
Imperial gallons per 100 miles (Imp gal/100 mi)
2.47804

Distance per fuel volume

Kilometres per Imperial gallon (km/Imp gal)
64.9441
Kilometres per US gallon (km/US gal)
54.0773
Miles per Imperial gallon (mpg (Imp))
40.3544
Miles per US gallon (mpg (US))
To
33.6021
Kilometres per litre (km/L)
14.2857
Miles per litre (mi/L)
8.87673

How it works

  1. 1

    Enter value and source unit

    Enter the consumption or efficiency value and choose the source unit.

  2. 2

    Choose the target unit

    Choose the target unit, such as l/100 km, km/L, mpg (US), or mpg (UK).

  3. 3

    Copy the result

    Copy one or all results for further use.

Good to know

The fuel consumption converter converts directly in your browser between consumption per distance (e.g., l/100 km) and efficiency per fuel amount (e.g., km/L, mpg). Since mpg (US) is based on the US gallon (3.785411784 L) and mpg (UK) on the imperial gallon (4.54609 L), the two are different units.

Calculation runs locally in the browser. Important: “L/100 km” measures consumption, where smaller values are better; “km/L” and “mpg” measure efficiency, where larger values are better. Real fuel use also depends on driving style, route, temperature, and vehicle condition.

Typical use cases

Compare vehicle consumption between markets

Convert l/100 km from European figures into mpg to compare US or UK vehicle tests.

Correctly distinguish US and UK mpg figures

Convert mpg (US) specifically into mpg (UK), since both are based on different gallon sizes and aren't directly comparable.

Tips for better results

Don't confuse consumption and efficiency

For l/100 km, smaller values are better; for km/L and mpg, larger values are — confusing them quickly leads to wrong conclusions.

Don't equate US and imperial gallons

The US gallon (3.785411784 L) and the imperial gallon (4.54609 L) differ by about 20% — which makes mpg (US) and mpg (UK) different units.

Features

  • Consumption and efficiency together

    Convert between linear consumption units and reciprocal efficiency units such as km/L and mpg.

  • Local conversion

    Calculation happens directly in the browser, without transmission to a server.

  • US and UK mpg separated

    mpg (US) and mpg (UK) are treated as distinct units with different gallon bases.

Frequently asked questions

Why are mpg (US) and mpg (UK) different?

Because they're based on gallons of different sizes: the US gallon is 3.785411784 L, the imperial gallon 4.54609 L.

Are my inputs uploaded?

No. Conversion runs entirely locally in the browser.

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