Calculate your vehicle's fuel efficiency in MPG (miles per gallon). Enter distance driven and fuel consumed to get MPG, L/100km, and cost per mile instantly.
📊 Calculate Fuel Efficiency
📈 Results
🔄 MPG ↔ L/100km Converter
Common Conversion Reference
| MPG | L/100km | Fuel Efficiency Rating |
|---|---|---|
| 15 | 15.68 | 🔴 Very poor |
| 20 | 11.76 | 🟠 Below average |
| 25 | 9.41 | 🟡 Average |
| 30 | 7.84 | 🟢 Good |
| 35 | 6.72 | 🟢 Efficient |
| 40 | 5.88 | 🔵 Very efficient |
| 50 | 4.70 | 🔵 Hybrid level |
📖 How to Use
- Enter the distance you drove — choose miles or kilometers
- Enter how much fuel you used — choose gallons or liters
- Optional: enter gas price to calculate fuel cost
- Results update automatically, including MPG↔L/100km conversion
Tip: The US uses US gallons (1 gal = 3.785 L), while the UK uses imperial gallons (1 gal = 4.546 L). This tool uses US gallons by default. A higher MPG means better fuel economy; a lower L/100km means better fuel economy.
About the MPG Calculator
MPG (Miles Per Gallon) is the standard measure of fuel efficiency in the United States and United Kingdom. Our MPG Calculator helps you quickly determine your vehicle's fuel economy by simply entering the distance you've driven and the amount of fuel consumed.
This tool also supports bidirectional conversion between MPG and L/100km (liters per 100 kilometers). The conversion formula is: L/100km = 235.215 ÷ MPG. For example, 30 MPG equals approximately 7.84 L/100km, and 25 MPG equals approximately 9.41 L/100km.
If you're car shopping, comparing MPG ratings is a great way to evaluate fuel economy. Generally, a MPG of 25-30 is average for sedans, 30-40 is fuel-efficient, and 40+ is excellent (typical of hybrid vehicles). Trucks and large SUVs typically get 15-22 MPG.
For drivers outside the US who are more familiar with L/100km, this converter makes it easy to understand American fuel economy ratings. All calculations run entirely in your browser — no data is sent to any server, and no registration is required. Works seamlessly on both mobile and desktop.