**How To Calculate Mpg**. Now that you have all of the data you need its time to calculate your cars gas mileage. It also calculates the total cost of fuel for a trip.

Use the Gas Mileage Calculator. Fill up your gas tank all the way. Now that you have all of the data you need its time to calculate your cars gas mileage.

### Formula to calculate MPG.

MPG calculator is used to calculate how many miles per gallon a car would cover. Easily work out your cars real miles per gallon MPG using our free calculator. This free fuel cost calculator estimates the fuel cost of a trip based on fuel efficiency distance and gas price using various units of measurement. Now that you have all of the data you need its time to calculate your cars gas mileage.