Conversion family

Fuel Efficiency conversion calculators

Use fuel-efficiency conversions to compare vehicle economy across countries.

These 12 guides cover the most commonly searched unit pairs. Each page includes the exact relationship, worked values, and a reverse-conversion path.

Convert imp mpg to km/limp mpg to km/l Convert imp mpg to L/100 kmimp mpg to L/100 km Convert imp mpg to mpgimp mpg to mpg Convert km/l to imp mpgkm/l to imp mpg Convert km/l to mpgkm/l to mpg km/l to L/100 km Converterkm/l to L/100 km L/100 km to MPG ConverterL/100 km to mpg Convert L/100 km to imp mpgL/100 km to imp mpg Convert L/100 km to km/lL/100 km to km/l Convert mpg to imp mpgmpg to imp mpg Convert mpg to km/lmpg to km/l MPG to L/100 km Convertermpg to L/100 km

How to use fuel efficiency conversions

Choose the guide whose source unit matches the value you already have and whose target unit matches the format you need. Enter the value without rounding it first, review the displayed relationship, and round only the final answer to the precision your task requires. Popular starting points in this family include Imperial Miles Per Gallon to Kilometers Per Liter, Imperial Miles Per Gallon to Liters Per 100 Kilometers, Imperial Miles Per Gallon to Miles Per Gallon.

Fuel-consumption units do not all increase in the same direction. Higher miles per gallon means better efficiency, while lower liters per 100 kilometers means better efficiency, so conversions between them use an inverse relationship rather than one fixed multiplier. Unit symbols can be case-sensitive, and similarly named units may belong to different systems, so check the label as well as the abbreviation before relying on the result.

Keep the original value at full precision until the final step.
Confirm the unit symbol, system, and measurement type.
Use the reverse guide to check that the result returns to the starting value.