Calculate gallons per mile from fuel used and distance, convert fuel economy, or estimate trip fuel cost and tailpipe CO2. Liquid volumes use US gallons unless another unit is selected; CNG quantities use gasoline gallon equivalents.

Convert between consumption and fuel economy.

Related Calculators

Gallons Per Mile Formula

The following formula is used to calculate the gallons per mile.

GPM = FC / DT

Variables:

  • GPM is the gallons per mile
  • FC is the fuel consumed (gallons)
  • DT is the distance traveled (miles)

To calculate gallons per mile, divide the total fuel consumed by the distance traveled.

What is Gallons Per Mile?

Gallons per mile (GPM) is a measure of fuel efficiency that indicates how many gallons of fuel a vehicle uses to travel one mile. It is an alternative to the more common miles per gallon (MPG) metric and can be particularly useful for comparing the fuel efficiency of vehicles that consume a lot of fuel, such as trucks or heavy machinery.

How to Calculate Gallons Per Mile?

The following steps outline how to calculate the Gallons Per Mile.

  1. First, determine the total fuel consumed (FC) in gallons.
  2. Next, determine the distance traveled (DT) in miles.
  3. Next, gather the formula from above: GPM = FC / DT.
  4. Finally, choose Gallons per mile from fuel used, enter the two values, and select Calculate.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

total fuel consumed (FC) = 15 gallons

distance traveled (DT) = 300 miles; GPM = 15 / 300 = 0.05 US gallons per mile.