Fuel Efficiency Converter
Convert fuel efficiency between different units used worldwide. Compare vehicle efficiency across US, UK, European, and Asian standards. Calculate trip fuel costs instantly.
Enter a value to see conversions
Lower L/100km = Better efficiency (European standard)
Higher MPG = Better efficiency (US/UK standard)
All conversions happen in your browser. No data is sent to any server.
Embed This Tool
Add this tool to your website with customizable styling
How to Use
- 1 Enter your fuel efficiency value — Type the efficiency rating you want to convert in the input field above.
- 2 Select the input unit — Choose the unit your value is in: MPG (US), MPG (UK), L/100km, km/L, or mi/L.
- 3 View all conversions instantly — See your value converted to all other fuel efficiency units in real-time.
- 4 Check your efficiency rating — See where your vehicle ranks on the efficiency scale from poor to excellent.
- 5 Calculate trip costs — Enter distance and fuel price to estimate your trip fuel costs.
Frequently Asked Questions
What's the difference between MPG (US) and MPG (UK)?
The UK uses Imperial gallons which are about 20% larger than US gallons. So the same vehicle will have a higher MPG number in the UK. For example, 30 MPG (US) equals about 36 MPG (UK).
Why do Europeans use L/100km instead of MPG?
L/100km (liters per 100 kilometers) is the standard in Europe and measures fuel consumption rather than efficiency. Lower numbers are better - a car using 5 L/100km is more efficient than one using 8 L/100km.
What's a good fuel efficiency rating?
Generally, 30+ MPG (US) or under 8 L/100km is considered good. Hybrids often achieve 45-55 MPG. SUVs and trucks typically range from 15-25 MPG depending on size.
How accurate is the trip cost calculator?
The calculator provides estimates based on ideal conditions. Real fuel consumption varies with driving style, traffic, terrain, and weather. Use it as a planning guide rather than an exact figure.