Fuel Economy Converter
Convert any fuel economy figure between L/100km, MPG US, MPG UK, and km/L in one click.
Fuel Economy Converter
MPG ⇄ L/100km ⇄ km/L
How It Works
All units are derived from L/100km as the common base. The calculator converts your input to L/100km, then derives all other units using standard conversion factors.
How to Use This Calculator
- Enter your current fuel economy figure.
- Select the unit it is in from the dropdown.
- Click Convert to see all other units.
- Read the equivalent MPG, L/100km, and km/L values.
- Use the results to compare across regions (US, Europe, UK).
Worked Example
Reference Table
| MPG US | MPG UK | L/100km | km/L | Typical Vehicle |
|---|---|---|---|---|
| 60 | 72.1 | 3.92 | 25.5 | Hybrid/EV equivalent |
| 50 | 60.1 | 4.71 | 21.2 | Economy hybrid |
| 40 | 48.1 | 5.88 | 17.0 | Efficient compact |
| 35 | 42.1 | 6.72 | 14.9 | Average sedan |
| 28 | 33.6 | 8.40 | 11.9 | Average SUV |
| 20 | 24.0 | 11.76 | 8.5 | Large truck/SUV |
| 15 | 18.0 | 15.68 | 6.4 | Performance muscle car |
Frequently Asked Questions
What is the difference between US and UK MPG?
UK (Imperial) gallons are larger — 1 UK gallon = 1.2009 US gallons. So 40 MPG UK equals about 33.3 MPG US. Always confirm which system is being quoted, especially when comparing UK and American car specs.
Why is L/100km inversely related to MPG?
L/100km measures how much fuel you use per distance (lower is better), while MPG measures how far you go on a unit of fuel (higher is better). Mathematically they are reciprocals after unit conversion.
How do I compare a European car spec with a US EPA rating?
European WLTP figures are often stated in L/100km. Convert using L/100km = 235.214 ÷ MPG US. Note that WLTP and EPA test cycles differ, so real-world results may vary from either.
What is a good fuel economy for a family car in 2025?
A good benchmark is under 7.0 L/100km (over 33.6 MPG US) for a petrol family sedan. Hybrids commonly achieve 4.5–5.5 L/100km. Full EVs are often rated below 2.0 Le/100km on equivalent consumption.
