StraightToolsFuel Cost Calculator
Estimate fuel needed and total fuel cost for a trip.
Fuel-cost formula
Trip miles ÷ MPG = gallons required. Gallons × price per gallon = estimated fuel cost.
When to use this tool
Use the fuel-cost calculator to estimate how much fuel a road trip will consume and what that fuel may cost. It is useful for comparing routes, vehicles, and travel budgets.
How the result is calculated
Fuel used equals trip distance divided by vehicle fuel economy. Estimated cost equals fuel used multiplied by the fuel price you enter.
Worked example
A 300-mile trip in a vehicle averaging 30 mpg uses about 10 gallons. At $3.50 per gallon, the estimated fuel cost is $35.
What to keep in mind
Real mileage changes with traffic, speed, weather, terrain, idling, towing, tire pressure, and driving style. Fuel prices also vary by location and time.
About our calculations
StraightTools is designed to show the method behind the answer, not just the result. Inputs are handled in your browser for this tool. For important financial, legal, medical, tax, safety, or contractual decisions, verify the result with an appropriate authoritative source or qualified professional.