Calculate your vehicle's fuel efficiency in miles per gallon (MPG)
Our gas mileage calculator is a free, easy-to-use tool that helps you determine your vehicle's fuel efficiency in miles per gallon (MPG). Whether you're tracking your car's performance, comparing different vehicles, or trying to optimize your driving habits, this calculator provides accurate results instantly.
Note your vehicle's odometer reading before filling up with gas.
Fill your gas tank completely and note the amount of gallons used.
After driving, record your new odometer reading and calculate miles driven.
Enter your miles driven and gallons used, then click "Calculate MPG".