Annual Fuel Cost Calculator
How to Use This Calculator
- 1
Enter your expected yearly distance
Enter Annual Mileage (mi) as the miles you expect to drive in a year. Use your own odometer history if it differs from a standard mileage assumption.
- 2
Enter fuel economy and fuel price
Enter Fuel Economy (MPG) and Fuel Price ($) per gallon. Use a realistic average MPG for your driving and the current local price for the fuel your vehicle uses.
- 3
Review costs and fuel use
The results estimate annual, monthly, weekly, and daily fuel costs, gallons used, and cost per mile. The period table divides annual mileage evenly across its time periods.
Example Calculation
A driver travels 12,000 miles per year in a vehicle averaging 28 miles per gallon and buys fuel at $3.50 per gallon.
Annual Mileage (mi)
12,000
Fuel Economy (MPG)
28
Fuel Price ($)
3.50
Results
Annual Fuel Cost
$1,500.00
Monthly Cost
$125.00
Weekly Cost
$28.85
Daily Cost
$4.11
Gallons per Year
428.57 gal
Cost per Mile
$0.125
Insights card shows fuel consumption and average cost across the year.
Tips
A $0.50-per-gallon price increase adds about $214.29 per year
Change Fuel Price ($) from $3.50 to $4.00. At 428.57 gallons per year, the annual cost rises by approximately $214.29.
Driving 2,000 fewer miles saves about $250 at the same MPG and price
Change Annual Mileage (mi) from 12,000 to 10,000 while keeping the other inputs fixed. The estimate uses about 71.43 fewer gallons.
Test a realistic MPG rather than the vehicle’s best-case rating
Change Fuel Economy (MPG) to match your observed average. Stop-and-go traffic, speed, weather, cargo, and driving style can make real-world MPG differ from a published estimate.
What this calculator estimates
Annual fuel cost is the amount spent on fuel for a year of driving, based on distance, fuel economy, and price per gallon. It estimates fuel purchases only; it does not include other vehicle ownership or operating costs.
How the calculation works
Gallons per year = Annual mileage ÷ Fuel economy (miles per gallon)
Annual fuel cost = Gallons per year × Fuel price per gallon
Cost per mile = Fuel price per gallon ÷ Fuel economy
Monthly cost = Annual fuel cost ÷ 12
For the example, 12,000 miles ÷ 28 MPG = 428.57 gallons per year. Then 428.57 × $3.50 = approximately $1,500 in annual fuel cost. Cost per mile is $3.50 ÷ 28 = $0.125. Dividing the annual cost by 12 gives $125 per month; dividing by 52 gives approximately $28.85 per week.
The weekly and daily results are averages. The period table spreads mileage and fuel use evenly, so it does not predict when you will buy fuel or account for seasonal driving.
How mileage, MPG, and price change the cost
Annual cost rises with mileage and fuel price. It falls as fuel economy improves, assuming the distance and fuel price stay the same.
| Annual mileage | Fuel economy | Fuel price | Estimated annual cost |
|---|---|---|---|
| 10,000 mi | 28 MPG | $3.50/gal | $1,250 |
| 12,000 mi | 28 MPG | $3.50/gal | $1,500 |
| 12,000 mi | 35 MPG | $3.50/gal | $1,200 |
Use the auto fuel cost per mile calculator to focus on the cost of a trip or mile. To compare gasoline with a hybrid vehicle, use the hybrid vs. gas car fuel cost calculator.
Make the estimate match your driving
Calculate fuel economy from your own records when possible: divide the miles driven between fill-ups by the gallons needed to refill the tank. Repeat over several tanks to smooth out differences caused by partial fills or unusual driving. For an upcoming move, use the fuel cost for moving truck calculator because a loaded truck’s fuel economy may differ substantially from your usual vehicle.
Fuel-price changes can materially alter a yearly budget. Test both a lower and a higher local price instead of assuming today’s price will remain constant. The EPA and DOE’s FuelEconomy.gov comparison tools can help compare vehicle fuel economy, while EIA’s gasoline price data provides broader price context.
When to use a different calculator
- Estimate fuel cost for a one-time moving trip → fuel cost for moving truck calculator
- Compare fuel spending per mile or kilometer → fuel cost per mile vs. per kilometer converter
- Compare an electric or hybrid vehicle with a gas car → hybrid vs. gas car fuel cost calculator
- Estimate broader vehicle ownership costs → auto depreciation calculator
Frequently Asked Questions
How do I calculate annual fuel cost?
Divide annual miles by miles per gallon to find gallons used, then multiply gallons by the price per gallon. For 12,000 miles at 28 MPG, 12,000 ÷ 28 = 428.57 gallons; at $3.50 per gallon, fuel costs about $1,500.
Does the estimate include maintenance or vehicle depreciation?
No, it estimates fuel only. It excludes maintenance, insurance, registration, financing, depreciation, parking, and tolls.
Why is my actual MPG lower than the number on the window sticker?
Your real-world fuel economy can differ because of traffic, speed, weather, terrain, vehicle condition, cargo, and driving habits. Use your own measured miles per gallon for a closer budget estimate; the EPA’s FuelEconomy.gov vehicle information lets you look up and compare vehicle ratings.
Does this calculator account for gas prices changing during the year?
No, it applies one Fuel Price ($) to all projected fuel use. If prices vary widely, run separate estimates at low and high prices to see how sensitive your budget is.
How can I compare fuel prices over time?
The U.S. Energy Information Administration publishes gasoline price data and trends in its weekly petroleum price reports. A national or regional average can provide context, but use your local station price for a personal estimate.