Automotive & Transportation Converter
Convert fuel economy in every major system (MPG, L/100 km, km/L), horsepower variants, torque, tire pressure, engine displacement, and vehicle speed units.
Fuel Economy Converter
The most-searched automotive conversion — compare MPG and L/100 km directly.
For MPG ↔ L/100 km, see the dedicated tool: MPG to L/100 km.
All Automotive Converters
- MPG to L/100 kmUS MPG → L/100km
- L/100 km to MPGL/100km → US MPG
- Fuel Consumption ConverterAll fuel economy systems
- Horsepower Converterhp ↔ kW ↔ PS
- Engine Torque ConverterN·m ↔ ft·lb
- RPM to rad/srpm → rad/s
- km/h to mphkm/h → mph
- Tire Pressure Converterpsi ↔ bar ↔ kPa
- Engine Displacement ConverterL ↔ in³ ↔ cc
- Fuel Volume ConverterL ↔ gal ↔ imp gal
- Odometer Distance Convertermi ↔ km
- Acceleration Converterm/s² ↔ g
Why Fuel Economy Units Are Confusing
Fuel economy is expressed in four main systems depending on the country:
- US MPG — miles per US gallon. Higher is better.
- UK (imperial) MPG — miles per imperial gallon. Higher is better. About 20% higher than US MPG for the same actual consumption.
- km/L — kilometers per liter. Higher is better. Common in Japan and parts of Latin America.
- L/100 km — liters per 100 kilometers. Lower is better. Standard in continental Europe, Australia, Canada, and China.
The first three are direct "economy" measures — higher is better. L/100 km is an inverted measure — lower is better. This means the relationships are not simple linear ratios: converting MPG to L/100 km uses the formula L/100 km = 235.214583 / MPG for US MPG. That makes fuel economy uniquely tricky to compare across systems.
Quick reference
| US MPG | UK MPG | km/L | L/100 km |
|---|---|---|---|
| 20 | 24 | 8.5 | 11.8 |
| 30 | 36 | 12.8 | 7.8 |
| 40 | 48 | 17.0 | 5.9 |
| 50 | 60 | 21.3 | 4.7 |
Tire pressure
The two dominant tire pressure units are psi (US) and bar (Europe). 1 bar = 14.5038 psi. A typical passenger car tire is inflated to 32–36 psi or 2.2–2.5 bar. Always follow the vehicle manufacturer's recommendation, which is usually printed on a sticker inside the driver's door jamb.