Fuel Cost Calculator
Calculate the total fuel cost for a trip based on distance, fuel efficiency (mpg) and fuel price.
- Your Trip Cost$37.5
- At Average 25 MPG$42
At the same fuel price, this trip would cost $42 in a vehicle averaging 25 MPG — your 28 MPG saves you $4.5.
- Fuel Needed10.71 gallons
ƒShow your work
- 1Gallons needed = 300 miles ÷ 28 mpg = 10.71 gallons
- 2Cost = 10.71 gallons × $3.5/gal = $37.5
About the Fuel Cost Calculator
This calculator turns a trip distance, your vehicle's fuel economy, and the current price at the pump into a single dollar figure for how much gas the drive will burn. It's built for the moment before a road trip — or before agreeing to a long commute — when you want a real number instead of a guess.
It gets used for budgeting a vacation drive, comparing the fuel cost of two possible routes, splitting gas money fairly for a shared ride, or working out whether it's cheaper to drive or fly somewhere once fuel is priced in.
The math is a straightforward division and multiplication, run entirely in your browser — nothing about your trip, vehicle or destination is saved or sent anywhere.
How it’s calculated
Gallons needed is simply trip distance divided by your vehicle's miles-per-gallon rating, and total cost is that gallon figure multiplied by the price per gallon. The result is compared against a 25 MPG baseline (roughly the current average for US passenger vehicles) so you can see how much your specific vehicle's efficiency is saving or costing you on this trip.
Frequently asked questions
What MPG number should I use if I don't know my car's exact fuel economy?
Check your vehicle's window sticker or owner's manual for the EPA combined rating, or calculate your real-world average with the Gas Mileage Calculator using your last fill-up's miles and gallons — actual mileage often runs a bit below the EPA sticker number, especially on highway trips at higher speeds.
Does this account for highway versus city driving?
No — it uses a single MPG figure for the whole trip. If your trip mixes highway and city driving, use a blended MPG estimate, or your vehicle's combined EPA rating, for a more realistic result.
How do I estimate fuel cost for a round trip?
Enter the round-trip distance (double the one-way mileage) rather than just the one-way distance, and the calculator will return the total fuel cost for the full trip there and back.
Why does the comparison bar show a 25 MPG baseline?
It's a rough average fuel economy figure for gas-powered passenger vehicles in the US, included so you have a quick reference point for whether your vehicle's efficiency is helping or hurting your fuel budget on this specific trip.
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