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Fuel Consumption Converter

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

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

Distance per fuel volume

Use as target unit: Kilometres per Imperial gallon
Kilometres per Imperial gallon (km/Imp gal)
64.9441
Use as target unit: Kilometres per US gallon
Kilometres per US gallon (km/US gal)
54.0773
Use as target unit: Miles per Imperial gallon
Miles per Imperial gallon (mpg (Imp))
40.3544
Use as target unit: Miles per US gallon
Miles per US gallon (mpg (US))
To
33.6021
Use as target unit: Kilometres per litre
Kilometres per litre (km/L)
14.2857
Use as target unit: Miles per litre
Miles per litre (mi/L)
8.87673
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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.

Typical searches include l/100km to mpg, mpg to l/100km, and convert fuel economy. 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.

How it works

Step by step

  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.

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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