Fuel Efficiency Converter — MPG, KM/L, L/100KM
Convert between miles per gallon, kilometers per liter, and liters per 100km.
Result
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💡 Quick Reference
Good Fuel Economy:
• Cars: 30-40 MPG (US) / 6-8 l/100km
• SUVs: 23-29 MPG (US) / 8-10 l/100km
• Trucks: 18-22 MPG (US) / 10-13 l/100km
Conversion Tips:
• Lower l/100km = Better efficiency
• Higher MPG/km/l = Better efficiency
• UK MPG ≈ US MPG × 1.2
About Fuel Efficiency Converter
The Fuel Efficiency Converter translates vehicle fuel consumption between miles per gallon (US MPG and UK MPG), kilometers per liter (km/l), and liters per 100 kilometers (l/100km). Enter any fuel efficiency value and instantly see it in all common international formats.
Understanding fuel efficiency across different measurement systems helps when comparing vehicles from different countries, planning international trips, or researching car specifications. All conversions use precise standard factors and run entirely in your browser.
How to Use Fuel Efficiency Converter
- Enter the fuel efficiency value you want to convert.
- Select the unit you are converting from (MPG US, MPG UK, km/l, or l/100km).
- Select the unit you want the result in.
- View the converted result instantly with the formula shown.
- Use the swap button to quickly reverse the conversion direction.
Key Features
Convert between 4 fuel efficiency units
Supports US MPG, UK MPG, km/l and l/100km
Live results as you type
Swap button for quick direction reversal
Precise conversion factors
One-click copy of results
100% client-side for privacy
Mobile-friendly interface
Frequently Asked Questions
What is the difference between US MPG and UK MPG?
US MPG uses US gallons (3.785 liters) while UK MPG uses imperial gallons (4.546 liters). A car that gets 30 US MPG equals about 36 UK MPG. UK gallons are approximately 20% larger than US gallons.
How do I convert MPG to l/100km?
To convert US MPG to l/100km, divide 235.214 by the MPG value. For example, 30 MPG equals about 7.84 l/100km. Lower l/100km values mean better fuel efficiency.
Which fuel efficiency measurement is better?
l/100km is more intuitive as lower numbers mean better efficiency (less fuel consumed). MPG can be confusing because higher numbers are better. Most countries outside the US use l/100km or km/l.
What is good fuel efficiency?
For cars: 6-8 l/100km (30-40 MPG) is good, under 6 l/100km (over 40 MPG) is excellent. For SUVs: 8-10 l/100km (23-29 MPG) is good. Electric vehicles use MPGe (miles per gallon equivalent).
How do you calculate km per liter?
Divide kilometers driven by liters of fuel consumed. For example, if you drive 400 km using 40 liters, you get 10 km/l. Higher km/l values indicate better fuel efficiency.