AUTO CALCULATOR
Fuel Economy Calculator
Convert fuel economy between MPG, L/100 km, km/L, and other common fuel-efficiency measurements.
Enter your vehicle's fuel economy to convert it between common measurement systems.
What Is Fuel Economy?
Fuel economy describes how efficiently a vehicle uses fuel. Different countries use different measurements to describe the same vehicle's fuel efficiency.
In the United States, fuel economy is commonly measured in miles per gallon (MPG). Many other countries use liters per 100 kilometers (L/100 km).
MPG vs. L/100 km
MPG measures how far a vehicle can travel using one gallon of fuel. Therefore, a higher MPG generally means better fuel economy.
L/100 km measures how many liters of fuel a vehicle uses to travel 100 kilometers. Therefore, a lower L/100 km generally means better fuel economy.
How to Convert MPG to L/100 km
To convert miles per gallon to liters per 100 kilometers, use:
L/100 km = 235.215 ÷ MPG
For example, a vehicle rated at 25 MPG has fuel consumption of approximately:
235.215 ÷ 25 = 9.41 L/100 km
How to Convert L/100 km to MPG
To convert L/100 km to MPG, use the reverse calculation:
MPG = 235.215 ÷ L/100 km
For example, a vehicle using 8 L/100 km gets approximately:
235.215 ÷ 8 = 29.40 MPG
What Is km/L?
Kilometers per liter (km/L) measures how many kilometers a vehicle can travel using one liter of fuel.
A higher km/L value generally indicates better fuel efficiency.
To convert L/100 km to km/L:
km/L = 100 ÷ L/100 km
Fuel Economy Example
Suppose two vehicles have the following fuel economy:
- Vehicle A: 25 MPG
- Vehicle B: 35 MPG
Vehicle B has better fuel economy because it can travel more miles using the same amount of fuel.
The difference can become significant over thousands of miles of driving.
Why Fuel Economy Matters
Fuel economy can affect both the cost of operating a vehicle and the amount of fuel it consumes over time.
Comparing fuel economy can be especially useful when choosing between vehicles or estimating long-term driving expenses.
Fuel Economy vs. Gas Mileage
The terms fuel economy and gas mileage are often used interchangeably, but they can describe slightly different concepts depending on the measurement being used.
Our Gas Mileage Calculator calculates fuel economy from the distance driven and amount of fuel consumed.
Fuel Economy vs. Fuel Cost
Fuel economy tells you how efficiently a vehicle uses fuel. Fuel cost tells you how much money you spend on that fuel.
You can use our Fuel Cost Calculator to estimate the cost of a trip using your vehicle's fuel efficiency and fuel price.
Frequently Asked Questions
What is the difference between MPG and L/100 km?
MPG measures distance traveled per gallon of fuel, while L/100 km measures liters of fuel used to travel 100 kilometers. Higher MPG generally means better efficiency, while lower L/100 km means better efficiency.
How many L/100 km is 25 MPG?
25 MPG is approximately 9.41 L/100 km.
How many MPG is 8 L/100 km?
8 L/100 km is approximately 29.40 MPG.
Is higher MPG better?
Generally, yes. A higher MPG means a vehicle can travel farther using the same amount of fuel.
Is lower L/100 km better?
Yes. A lower L/100 km value means the vehicle uses less fuel to travel 100 kilometers.
What is good fuel economy?
Good fuel economy depends on the type of vehicle and how it is driven. Comparing similar vehicles using the same measurement system provides a more useful comparison.