How many gallons will the trip need?
Plan your fuel consumption and an approximate number of refuels.
Open calculator →CALCULATORS / GAS
Fuel cost calculator
Get gallons, price per mile and cost per person from your own numbers.
Fuel cost
FREE · NO ACCOUNTDefault gas price $3.995/gal (EIA Gasoline and Diesel Fuel Update, U.S. regular, week of Nov 9, 2026); other defaults are illustrative. Confirm local fuel and electricity rates before planning.
Fuel cost formula
Gallons = distance ÷ MPG. Multiply the result by the price per gallon. If you select round trip, the distance doubles; this calculator assumes the same toll amount on the return journey.
Why your real MPG may vary
High speed, hills, wind, traffic, temperature and loading can change consumption. An EPA combined MPG value is a starting estimate, not a guarantee for a specific route.
Worked example
A 240-mile trip at 30 MPG uses 8 gallons. At $3.995/gal (EIA Gasoline and Diesel Fuel Update, U.S. regular, week of Nov 9, 2026) the fuel cost is $31.96. Split by four passengers, the fuel portion is $7.99 each.
Frequently asked questions
Does the fuel calculator use current prices?
The default is an example. Change it to your local fuel price for a useful estimate.
Can I use highway MPG instead of combined?
Yes. Type the MPG that matches the driving conditions you expect.
Keep exploring
What does one mile cost in gas?
Turn miles per gallon into dollars per mile, then multiply by the distance you drive.
Open calculator →Split gas money fairly
Calculate a clear per-person amount for road trips, carpools and shared drives.
Open calculator →