Fuel Economy Converter

Convert between mpg, km/L, and L/100km.

Fuel Economy Converter

Fill in the fields below to calculate

Liters per 100 km

Miles per Gallon (US)

Miles per Gallon (UK)

Kilometers per Liter

About Fuel Economy

Fuel economy measures how efficiently a vehicle uses fuel. Higher MPG and km/L values mean better efficiency; lower L/100km means less fuel consumed per distance.

Note: US and UK gallons differ — 1 UK gallon = 1.20095 US gallons, so UK MPG is always higher than US MPG for the same vehicle.

Quick Reference

L/100km	MPG (US)	km/L
5	47.0	20.0
8	29.4	12.5
12	19.6	8.3

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Pro Tips

The MPG and L/100km relationship is inverse — better fuel economy means higher MPG but lower L/100km.

An average car gets around 30 MPG (US) ≈ 7.8 L/100km — use this as a benchmark for comparisons.