Fuel Consumption Converter
CONVERTConvert fuel consumption and economy between MPG, L/100km and km/L for any car.
Enter a value and click Convert
ℹ️ About Fuel Consumption Converter
Fuel consumption is measured differently around the world, which makes comparing cars confusing. The US uses miles per gallon (MPG), Europe uses litres per 100 km (L/100km), and some places use kilometres per litre (km/L). This converter translates between them instantly, so you can compare a car's economy figures no matter which unit the brochure quotes — and work out what they really mean for your wallet.
📖 How to Use Fuel Consumption Converter
1
Enter a value
Type the fuel figure you have (e.g. 40 MPG).
2
Pick the units
Choose the unit you're converting from and to.
3
Read the result
See the equivalent in the other units instantly.
4
Compare
Convert competing cars to the same unit to compare fairly.
💡 Examples
MPG to metric
INPUT
40 MPG (US)→
OUTPUT
≈ 5.9 L/100kmMetric to MPG
INPUT
6 L/100km→
OUTPUT
≈ 39 MPG (US)km/L to L/100km
INPUT
15 km/L→
OUTPUT
≈ 6.7 L/100km📊 Fuel Economy Conversions
Approximate equivalents (US gallon):
| MPG (US) | L/100km | km/L |
|---|---|---|
| 20 | 11.8 | 8.5 |
| 30 | 7.8 | 12.8 |
| 40 | 5.9 | 17.0 |
| 50 | 4.7 | 21.3 |
| 60 | 3.9 | 25.5 |
Rounded. UK (Imperial) MPG figures run ~20% higher for the same car.
🚀 Pro Tips
✓MPG and km/L are "higher is better"; L/100km is "lower is better" — don't compare them the wrong way round.
✓US and UK (Imperial) gallons differ — a UK gallon is about 20% larger, so UK MPG figures look higher. Check which gallon a figure uses.
✓L/100km is the most intuitive for cost: it tells you fuel used per fixed distance.
✓Convert every car you're comparing into the same unit before judging which is more economical.
✓Real-world economy is usually a bit worse than the quoted figure — treat brochure numbers as a best case.