Fuel Efficiency Converter
Convert between different fuel efficiency units like km/l, MPG, and L/100km. Perfect for comparing vehicles from different regions and understanding fuel economy.
Convert Fuel Efficiency
Quick Conversions
Results
Enter fuel efficiency value and select units to convert
Efficiency Comparison
Common Vehicle Efficiency
Fuel Efficiency Conversion Factors
km/l to MPG (US)
km/l × 2.352 = MPG
MPG (US) to L/100km
235.215 ÷ MPG = L/100km
MPG (UK) to km/l
MPG × 0.354 = km/l
L/100km to MPG
235.215 ÷ L/100km = MPG
Using the Fuel Efficiency Converter
Input Value
Type your fuel efficiency number in the main input box.
Choose Units
Select what unit you have and what you want to convert to.
View Result
The conversion happens automatically and shows the result.
What Fuel Efficiency Really Means
Fuel efficiency tells you how far a vehicle can travel using a specific amount of fuel. It's more than just a number—it directly impacts your wallet and the environment.
Better efficiency means fewer fuel stops, lower costs, and reduced emissions. Whether you're buying a car, planning a road trip, or just curious about your vehicle's performance, understanding these measurements helps you make smarter decisions.
Why Different Countries Use Different Units
Fuel efficiency can be measured in two fundamental ways: distance per fuel or fuel per distance. This creates the divide you see between different countries.
Distance per Fuel
km/l and MPG measure "How far can I go?" Higher numbers are better. Used in most Asian countries, US, and UK.
Fuel per Distance
L/100km measures "How much fuel do I need?" Lower numbers are better. Used in Europe and scientifically.
This difference reflects cultural preferences—some cultures prefer thinking about distance achieved, others about fuel consumed.
Common Fuel Efficiency Units
| Unit | Used In | Example |
|---|---|---|
| km/l | Asia, some European countries | 15 km/l (good efficiency) |
| MPG (US) | United States | 35 MPG (good efficiency) |
| MPG (UK) | United Kingdom | 40 MPG (good efficiency) |
| L/100km | Europe, Canada, Australia | 6.7 L/100km (good efficiency) |
Conversion Example
Example: Converting 20 km/l to MPG (US)
If a car gets 20 kilometers per liter, how many miles per gallon does it get in the US system?
20 km/l × 2.352 = 47 MPG
This car would be considered very fuel efficient in the US market.
This conversion helps compare vehicles sold in different regions and understand relative efficiency.
How the Calculator Uses the Conversion Logic
The calculator uses a systematic approach to convert between fuel efficiency units. It starts by understanding that all fuel efficiency measurements are fundamentally about distance and fuel consumption.
The process: Convert the input value to a standard distance/fuel ratio, then adjust the units of measurement. For example, to convert km/l to MPG, it multiplies by the appropriate conversion factors for kilometers to miles and liters to gallons.
This ensures accurate conversions that account for both distance measurements (kilometers vs miles) and fuel measurements (liters vs gallons).
Fuel Efficiency in Real Life
Car Buying Decisions
Compare fuel costs across different models and brands.
- • Annual fuel savings
- • Total ownership costs
- • Environmental impact
Trip Planning
Calculate fuel needs and costs for road trips.
- • Fuel stop planning
- • Budget estimation
- • Route optimization
Daily Cost Awareness
Understand the real cost of commuting.
- • Weekly fuel expenses
- • Monthly transportation costs
- • Savings from efficiency
Vehicle Maintenance
Track changes in fuel efficiency over time.
- • Performance monitoring
- • Maintenance alerts
- • Efficiency optimization
Why This Fuel Efficiency Converter Is Different
Designed specifically for everyday drivers, not automotive engineers. This tool explains what the numbers mean in plain language, without overwhelming technical details.
It supports all major fuel efficiency units used worldwide, including the important distinction between US and UK gallons. The clean interface works perfectly on mobile devices, and the explanations help users understand why different regions use different measurements.
Unlike complex automotive calculators, this focuses on the practical need to compare fuel efficiency across borders and make informed decisions about vehicles and travel.
Common Questions
Why are US and UK MPG different?
The US gallon (3.785 liters) is smaller than the UK gallon (4.546 liters). The same volume of fuel would give different MPG readings in each system due to this difference in gallon size.
Which fuel efficiency unit is most accurate?
All units are equally accurate—they just express the same information differently. L/100km is often preferred scientifically because it scales linearly with fuel cost, while MPG scales inversely.
How do electric vehicles fit into fuel efficiency?
Electric vehicles are often rated in MPGe (Miles Per Gallon equivalent), which compares their energy efficiency to gasoline vehicles. A Tesla Model 3 might achieve 120 MPGe, meaning it uses energy equivalent to getting 120 MPG in a gas car.