Free Fuel Economy Converter
Convert between MPG (US), MPG (UK), L/100km, and km/L. Instant fuel economy and gas mileage conversion calculator.
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30 MPG (US) =
Formula
MPG (US) × 0.4251 = km/L | km/L = 100 ÷ L/100km | MPG (US) × 1.201 = MPG (UK)How Fuel Economy Conversion Works
Fuel economy is measured differently around the world. The US uses miles per gallon (MPG), Europe and Australia use liters per 100 kilometers (L/100km), and some Asian countries use kilometers per liter (km/L). This converter handles all formats instantly.
Fuel Economy Units
- MPG (US) — miles per US gallon. Higher is better. Standard in the United States.
- MPG (UK) — miles per imperial gallon. UK gallons are 20% larger than US gallons, so UK MPG values are always higher.
- L/100km — liters per 100 kilometers. Lower is better. Standard in Europe, Canada, and Australia.
- km/L — kilometers per liter. Higher is better. Used in parts of Asia and South America.
Quick Reference
- 20 MPG (US) = 11.76 L/100km = 8.50 km/L
- 30 MPG (US) = 7.84 L/100km = 12.75 km/L
- 40 MPG (US) = 5.88 L/100km = 17.01 km/L
- 50 MPG (US) = 4.70 L/100km = 21.26 km/L
Frequently Asked Questions
How do I convert MPG to L/100km?
Divide 235.215 by the MPG (US) value. For example, 30 MPG = 235.215 ÷ 30 = 7.84 L/100km. Higher MPG means lower L/100km (better fuel economy).
What is the difference between US and UK gallons?
A US gallon is 3.785 liters while a UK (imperial) gallon is 4.546 liters. This means UK MPG numbers are always higher than US MPG for the same vehicle. Multiply US MPG by 1.201 to get UK MPG.
What is a good fuel economy?
In the US, 30+ MPG is considered good for a car. Hybrids typically get 40-60 MPG, and EVs can achieve 100+ MPGe. In metric countries, 6-8 L/100km is considered efficient.
Why does Europe use L/100km instead of km/L?
L/100km tells you how much fuel you need for a fixed distance, making it easier to calculate fuel costs for trips. Lower numbers are better. Most of Europe, Australia, and Canada use this format.