Fuel Cost Calculator
Calculate the fuel cost of any trip from distance, MPG, and gas price. See total cost, gallons needed, and cost per mile.
Trip details
Trip cost
$37.50
10.71 gallons needed at $0.1250 per mile
Gallons needed
10.71
Cost per mile
$0.1250
Cost per 100 mi
$12.50
Frequently Asked Questions about the Fuel Cost Calculator
How is the fuel cost for a trip calculated?
Divide the trip miles by your vehicle's MPG to get gallons needed, then multiply by the price per gallon. The calculator also returns the cost per mile and per 100 miles.
What MPG should I use for my car?
Use your real-world average if you track it. Otherwise, use the EPA combined rating for your make, model, and year. Real-world MPG is typically 10 to 25% lower than the sticker estimate.
How do I convert between MPG and L/100km?
Use L/100km = 235.21 divided by MPG. So 30 MPG equals about 7.84 L/100km. Lower L/100km values mean better efficiency, the opposite of how MPG scales.
How can I lower the fuel cost of a long trip?
Keep tires properly inflated, drive steadily at or below 65 MPH, remove roof racks when not needed, and combine short stops. Apps that find cheaper stations along your route also help meaningfully.
Should I include tolls or just fuel in trip planning?
This calculator covers fuel only. For full trip cost, add tolls, parking, and an estimate for vehicle wear (the IRS standard mileage rate of 67 cents per mile in 2024 is a useful proxy).
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