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Dedicated unit pair

Miles per US gallon to Litres per 100 kilometres

Convert mpg (US) to L/100 km instantly, then review the formula, assumptions, and rounding guidance.

Fuel consumption & efficiencyInstant result
Decimals
Formula Convert mpg (US) to litres per 100 kilometres, then convert to L/100 km. 1 mpg (US) = 235.2146 L/100 km
Common examples
One value, several units
Litres per 100 kilometres235.2146 L/100 km
Miles per imperial gallon1.2009 mpg (imp)
Kilometres per litre0.4251 km/L

Conversion table

mpg (US)L/100 km
1 mpg (US)235.2146 L/100 km
2 mpg (US)117.6073 L/100 km
5 mpg (US)47.0429 L/100 km
10 mpg (US)23.5215 L/100 km
25 mpg (US)9.4086 L/100 km
50 mpg (US)4.7043 L/100 km
100 mpg (US)2.3521 L/100 km

Conversion chart

1 mpg (US)235.2146 L/100 km
5 mpg (US)47.0429 L/100 km
10 mpg (US)23.5215 L/100 km
25 mpg (US)9.4086 L/100 km
50 mpg (US)4.7043 L/100 km
Worked example

8 L/100 km is approximately 29.4 US mpg.

Unit definition

Miles per US gallon (mpg (US)) This unit is defined through the displayed non-linear relationship to litres per 100 kilometres.

Unit history

Miles per US gallon is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.

Step by step

1. Parse the value, including fractions.
2. Convert mpg (US) to litres per 100 kilometres.
3. Convert the base value to L/100 km and apply your display precision.

Important

Fuel economy and fuel consumption are reciprocal measures; zero is not a valid input.

What this calculation means

Understand the result before using it

Miles per US gallon to Litres per 100 kilometres converts a value measured in Miles per US gallon (mpg (US)) into the equivalent value in Litres per 100 kilometres (L/100 km). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.

Calculated result

The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.

Method

Formula, assumptions, and example

Formula

Convert mpg (US) to litres per 100 kilometres, then convert the base value to L/100 km.

Assumptions

  • Miles per US gallon and Litres per 100 kilometres represent the same fuel consumption & efficiency quantity.
  • The input is expressed in mpg (US); the output is expressed in L/100 km.
  • Fuel economy and fuel consumption are reciprocal measures; zero is not a valid input.
Worked example

1 mpg (US) = 235.214583 L/100 km. For another value, apply the same relationship and round only to the precision your source measurement supports.

When to use it

Good uses

  • Read a mpg (US) measurement in a document that expects L/100 km.
  • Compare a miles per us gallon value with a value reported in litres per 100 kilometres.
  • Check the mpg (US)-to-L/100 km arithmetic before copying the result into another calculation.
Limitations

Common mistakes to avoid

  • Fuel consumption and fuel economy are reciprocal; zero and negative values are not physically valid inputs.
  • Round the output to a precision justified by the original measurement.
  • Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
References

Sources and further reading

These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.

SI BrochureInternational Bureau of Weights and Measures (BIPM)

Authoritative definitions of the International System of Units and SI prefixes.

FAQ

Questions about this calculation

How do I convert Miles per US gallon to Litres per 100 kilometres?

Convert mpg (US) to litres per 100 kilometres, then convert the base value to L/100 km. Using the displayed relationship, 1 mpg (US) equals 235.214583 L/100 km.

How many Litres per 100 kilometres are in one Miles per US gallon?

One Miles per US gallon is 235.214583 Litres per 100 kilometres. The displayed digits may be rounded.

Can I reverse the mpg (US) to L/100 km conversion?

Yes. Swap the source and target units in the converter. The reverse relationship converts L/100 km back to mpg (US).

Is the Miles per US gallon to Litres per 100 kilometres result exact?

The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.