Fuel Cost Calculator
Estimate the gas cost for any trip, or calculate your vehicle’s MPG from miles driven and gallons used.
This free fuel cost calculator works two ways: enter a trip distance, your car’s MPG, and the gas price to estimate how many gallons you need and what the trip will cost, or enter miles driven and gallons used to find your actual fuel economy. Everything runs in your browser with no sign-up.
How to Calculate Fuel Cost
Divide the trip distance by your car’s MPG to get gallons needed, then multiply by the gas price. For a 350-mile trip at 28 MPG with gas at $3.50, you need 12.5 gallons at a cost of $43.75. This calculator does it instantly.
Frequently Asked Questions
How do I calculate my MPG?
Fill your tank, note the odometer, drive until near empty, fill again and note the gallons. Divide the miles driven by the gallons used. Switch to MPG mode in this calculator to do the math.
What is a good MPG?
The US average is about 25 MPG. Compact cars get 30 to 40, hybrids 40 to 60, and trucks 15 to 22. Higher MPG means lower fuel costs per mile.