Converters
Fuel Economy Converter
Convert between fuel economy units like MPG, L/100km, and km/L. Compare vehicle efficiency across American, European, and metric standards.
Free · Runs in your browser · No signup · Files stay on your device
Result
7.84
How to use
How to use Fuel Economy Converter
- 1Enter a fuel economy value in the input field.
- 2Select the source unit (From) and target unit (To).
- 3The converted value appears instantly. Use Swap to reverse the conversion.
Tips
Quick tips
- The US uses MPG (miles per US gallon). The UK uses MPG (miles per imperial gallon) — UK gallons are about 20% larger.
- L/100km is the European standard. Lower numbers mean better fuel economy.
- 30 MPG (US) ≈ 7.84 L/100km ≈ 12.75 km/L.
FAQ
Frequently asked questions
What is the difference between US MPG and UK MPG?
US gallons (3.785 L) are smaller than UK imperial gallons (4.546 L). So the same car will have a higher MPG number in UK units than in US units.
How do I convert MPG to L/100km?
Divide 235.215 by the US MPG value. For example, 30 MPG = 235.215 / 30 ≈ 7.84 L/100km.
Why is L/100km inverted compared to MPG?
MPG measures distance per unit of fuel (higher = better), while L/100km measures fuel per unit of distance (lower = better). They are reciprocal measures.
What is good fuel economy?
It varies by vehicle type. Generally, under 6 L/100km (over 39 MPG US) is considered excellent for passenger cars.
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