Unit Converters
Fuel Economy Converter
Fuel Economy Converter switches a vehicle's fuel efficiency between MPG (US), MPG (UK/Imperial), kilometres per litre and litres per 100km.
These figures aren't simple linear conversions -- MPG and km/L are efficiency measures (higher is better) while L/100km is a consumption measure (lower is better) -- and this tool handles the maths for you.
How to Use the Fuel Economy Converter
- Open the Fuel Economy Converter tool.
- Enter the fuel economy value you want to convert.
- Choose the unit you're converting from.
- Choose the unit you want to convert to.
- Read the converted result, updated instantly.
Frequently Asked Questions
Why are US MPG and UK MPG different?
A US gallon and an imperial (UK) gallon are different volumes, so the same fuel economy in miles per gallon translates to different real-world efficiency between the two.
Why isn't this a simple multiplication like other converters?
MPG and km/L measure distance per unit of fuel, while L/100km measures fuel per unit of distance -- they're reciprocal relationships, not a fixed ratio, so the tool converts through a common baseline internally.
Which unit should I use to compare cars?
L/100km or km/L are generally easier for comparing relative efficiency, since equal differences represent equal fuel savings, unlike MPG.