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Fuel Economy Converter
Convert fuel economy between mpg, liters per 100 km and kilometers per liter.
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How to Use This Converter
Type a value in either box and pick the units. The other box updates instantly. Use the swap button to reverse the direction.
- All 6 units are supported in both directions.
- Results update live as you type — no button to press.
- Values are formatted for readability while staying precise.
Frequently Asked Questions
How do I convert L/100km to mpg?
Divide 282.5 by the L/100km value for US mpg (235.2 for UK). Higher mpg = lower fuel consumption.
Is lower L/100km better?
Yes. It is the fuel used to travel 100 km, so a lower number means better efficiency.
Why are US and UK mpg different?
They use different gallon sizes — the UK gallon is about 20% larger, so UK mpg numbers are higher.
What is a good fuel economy?
Modern cars range from about 4-8 L/100km (30-60 US mpg). Hybrids and EVs do far better.
Practical Example
Convert a car that uses 6 L/100km to miles per gallon. US mpg = 235.2 ÷ 6 ≈ 39.2 mpg, while UK mpg = 282.5 ÷ 6 ≈ 47.1 mpg.
- In kilometers per liter: 100 ÷ 6 ≈ 16.7 km/L
- US mpg formula: 235.2 ÷ L/100km
- UK mpg formula: 282.5 ÷ L/100km (imperial gallon is larger)
What Your Results Mean
- L/100km — liters burned per 100 km; a lower number means better efficiency.
- MPG (US) — miles per US gallon; a higher number is better.
- MPG (UK) — uses the imperial gallon (≈20% larger), so UK figures run higher than US.
- km/L — distance you can travel per liter of fuel.
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