Know Your Cost
Fuel Cost Calculator
The Fuel Cost Calculator tells you what fuel will cost for any distance you drive — a commute, an errand run, a delivery route, or a long haul. Fuel is often the single largest variable cost of running a vehicle, so seeing it in clear dollar terms makes it far easier to budget and to spot where you could save.
The tool needs just three inputs: the distance in miles, your vehicle’s MPG, and the gas price per gallon. From those it works out the total fuel cost, the number of gallons used, and your cost per mile. That cost-per-mile figure is particularly powerful: it lets you compare vehicles, routes, or fuel types on an even footing no matter how far each trip is.
Use it to estimate a monthly commuting bill, to compare the running cost of two cars, or to decide whether a cheaper gas station a few miles away is actually worth the detour. The calculation assumes steady, real-world MPG, so for the best accuracy use your true combined figure rather than the optimistic window-sticker number — city driving, traffic, cold starts, and a heavy right foot all push real consumption higher. For comparing two vehicles over a year, try our Fuel Savings calculator; for a full road-trip estimate broken down per 100 miles, see our Trip Cost calculator.
How to Use
- Enter the distance you plan to drive, in miles.
- Enter your vehicle’s MPG.
- Enter the current gas price per gallon.
- Click Calculate Fuel Cost (or press Enter).
- Review total cost, gallons used, and cost per mile.
Related tools: MPG Calculator, Trip Cost Calculator, Fuel Savings Calculator.
Got Questions?
Fuel Cost Calculator FAQ
Divide the distance by your MPG to find gallons used, then multiply by the price per gallon. For example, 120 miles ÷ 30 MPG × $3.50 = $14 in fuel.
Cost per mile is the fuel cost divided by the distance driven. It is a quick way to compare the running cost of different vehicles or routes regardless of trip length.
Multiply your typical daily or weekly mileage out to a month, then run it through this calculator with your MPG and local gas price. Commuters often find fuel is a major monthly expense.
No. The formula is identical for petrol, diesel, or E85 — just enter the correct price per gallon and your vehicle’s MPG on that fuel.
City driving, idling, traffic, cold weather, roof racks, and aggressive acceleration all lower real-world MPG, which raises actual cost above the estimate. Use your true combined MPG for accuracy.