How to use the Road Trip Gas Calculator

Estimate gas used and total fuel spending for a trip based on miles driven, vehicle MPG and gasoline price.

Calculation formula

Estimated gallons = miles ÷ MPG. Fuel cost = gallons × gas price per gallon.

Recommended steps

1. Enter values using the units shown beside each field.
2. Review whether the example assumptions match your situation.
3. Run the calculator and compare the key metrics.
4. Use the source data or official rates when precision matters.

Known limitations

Your actual fuel economy may vary with driving speed, load, weather, terrain and traffic. All prices are user-entered, not live quotes.