Fuel Efficiency Converter

Free Online Fuel Economy Converter & Cost Calculator

Convert fuel efficiency between km/L, L/100km, MPG (US), and MPG (UK) in real time, plus calculate fuel costs by distance.

⛽ What is Fuel Efficiency?

Fuel efficiency measures how far a vehicle can travel on a given amount of fuel. Common units include km/L (Korea), L/100km (Europe), and MPG (US/UK). Higher efficiency means less fuel consumed.

Input Unit

Efficiency Value

Conversion Results

km/L12

L/100km8.33

MPG (US)28.23

MPG (UK)33.9

Fuel Cost Calculator

Distance (km)

Fuel Price (per L)

Fuel Efficiency

Fuel Needed

8.33 L

Total Fuel Cost

14,167

📝 How to Use

Select your unit and enter the value
All conversions appear instantly
Use the cost calculator for trip estimates
Enter distance and fuel price for total cost

💡 Fuel Efficiency Tips

Average car efficiency: ~30 MPG (US)
Optimal speed: 45-65 mph for best efficiency
A/C use reduces efficiency by 10-20%
Proper tire pressure improves mileage
Avoid aggressive driving for up to 33% savings