Gas Mileage Calculator
Measure fuel economy, estimate trip gas costs, and compare vehicle fuel expenses in either imperial or metric units.
Units
Fuel economy calculator
Enter the distance traveled and fuel used to calculate your MPG.
How to Use
- Choose whether you want to calculate fuel economy, estimate a trip cost, or compare two vehicles.
- Switch between imperial and metric units depending on whether you use miles and gallons or kilometers and liters.
- Enter your distance, fuel efficiency, fuel used, or gas price in the relevant fields.
- Review the result cards to see MPG or km/L, trip fuel needs, estimated total fuel cost, or annual savings.
Frequently Asked Questions
How do you calculate gas mileage?
Gas mileage is calculated by dividing the distance traveled by the amount of fuel used. If you drove 300 miles and used 10 gallons, your fuel economy is 30 MPG.
What is considered good MPG?
Good MPG depends on the vehicle type. Many compact cars fall around 30 to 40 MPG on the highway, while trucks and SUVs are often lower. Hybrids can be much higher.
Can I use this calculator for kilometers and liters?
Yes. Switch the unit toggle to metric and the calculator will use kilometers, liters, and km/L instead of miles, gallons, and MPG.
How do I estimate the fuel cost of a road trip?
Enter your trip distance, your vehicle's fuel efficiency, and the local fuel price. The calculator estimates how much fuel you'll need and the total trip cost.
Why compare annual fuel costs between vehicles?
Comparing annual fuel cost helps show the real-world savings from choosing a more efficient vehicle. Even a small MPG difference can add up over thousands of miles each year.