Gas Mileage Calculator

About Gas Mileage Calculator

The gas mileage calculator estimates miles per gallon and liters per 100 km from trip fuel use.

How to Use

The gas mileage calculator estimates miles per gallon and liters per 100 km from trip fuel use. Enter the Miles driven and Gallons used values and review the Miles per gallon and Liters per 100 km outputs after you calculate.

  1. Open the calculator : Use Gas Mileage Calculator from the Auto category.
  2. Check the inputs : Review the required values and any optional settings.
  3. Read the formula : Use the formula and notes below to understand how the result is produced.

Common Questions

What formula does the Gas Mileage Calculator use?

MPG = miles driven / gallons used.

How do you calculate MPG manually?

To calculate your exact miles per gallon (MPG), divide the exact number of miles driven since your last fill-up by the number of gallons it took to refill your tank. For the most accurate reading, always reset your trip odometer while parked at the gas pump.

Inputs

  • Miles driven
  • Gallons used

Outputs

  • Miles per gallon
  • Liters per 100 km

Formula

MPG = miles driven / gallons used.