Fuel Economy Converter

How to use this calculator: km/L to mpg

1. 1Enter the value measured in km per litre (km/L).
2. 2Confirm the direction is km per litre (km/L) to Miles per gallon (mpg); reversing the units changes the factor or offset.
3. 3Apply mpg = km/L ÷ 0.425144. The live converter performs this substitution as you type.
4. 4Read the answer in mpg and keep only justified precision.

Conversion formula

km per litre and Miles per gallon express the same fuel economy quantity. This page converts through the category's canonical base unit, except temperature and fuel-economy pairs, which use their explicit scale or reciprocal equations.

The units measure the same quantity at different scales: 1 km/L = 2.35214422 mpg, and 1 mpg = 0.425144 km/L.

Worked conversion example: km per litre to Miles per gallon

1. Given: 1 km/L
2. Substitute: mpg = 1 × 2.35214422 = 2.35214422
3. Result: 1 km/L = 2.35214422 mpg

Accuracy checklist

The converter keeps extra precision internally. Report only the precision supported by the original measurement and follow the required rounding rule.

Direction check: a smaller unit usually gives a larger number; temperature is an exception.

Unit definitions and SI traceability: NIST Office of Weights and Measures — SI Units.