- Gas mileage calculatorMPG from one fill-up, plus cost per mile and per month.
- Used car checklistWhat to check on a used car, in the order you check it.
About these tools
Everything runs in your browser; nothing you type is sent to us. Fuel prices update every week from the U.S. Energy Information Administration, and fuel economy figures come from the EPA data file for every new vehicle since 1984. The results are estimates for planning: real-world mileage changes with weather, speed, load and maintenance, and local gas prices can be far from the national average.
The gas mileage calculator works from a fill-up: miles driven divided by the gallons needed to refill the tank. The fuel cost calculator runs the other way, turning a distance and an MPG figure into dollars for a single trip, a month or a full year, and it can compare two cars at once. The MPG comparison draws on the official EPA ratings for every model we track, showing the best and the least efficient version of each for the newest model year so you can see how much an engine or drivetrain choice changes the yearly fuel bill.
A practical way to use them together: measure your current car with the gas mileage calculator over two or three tanks, then enter that real figure in the fuel cost calculator next to the EPA rating of a car you are considering. The difference per year, multiplied by how long you keep a car, is the fuel part of the decision. Price, insurance and repairs are the other parts, and our model pages cover the repair side with complaint and recall counts.
If you are shopping for a used car, the tools pair well with our model pages, which show for every model year how many complaints owners filed with NHTSA, per 100,000 sold, and which recalls apply.