Fuel Cost Calculator
Find out exactly how much a trip will cost you in gas. Enter the distance, your vehicle's fuel economy in miles per gallon and the current gas price, and this calculator returns the gallons you will use, the total fuel cost and your cost per mile. Use it to budget a road trip, plan a commute or split costs — all computed privately in your browser.
What is a fuel cost calculator?
A fuel cost calculator is a tool that estimates how much money a trip will cost in gasoline. It multiplies the gallons of fuel your vehicle needs for a distance by the price of gas, and it also breaks that down into a cost per mile so you can compare driving against other options. The math is straightforward: your car uses a certain number of miles per gallon, so to cover a set distance you need distance ÷ MPG gallons, and those gallons cost gallons × price per gallon dollars.
Beyond the raw number, the cost per mile matters a lot for budgeting. If your car gets 25 MPG and gas costs $3.50 a gallon, every mile you drive costs about 14 cents in fuel. Multiply that by a daily commute and the real expense of driving becomes clear, and comparing two vehicles is as simple as comparing their cost per mile. Because gas prices move and your driving conditions change, this calculator uses only the inputs you provide, so you get a closer estimate than any generic figure — and it all runs locally, with nothing uploaded.
How to use
- Enter the trip distance in miles.
- Enter your vehicle's fuel economy in miles per gallon.
- Enter the gas price per gallon in dollars.
- Click Calculate fuel cost to see gallons used, total fuel cost and cost per mile.
Example
You plan a 300-mile drive in a car that gets 25 MPG, with gas at $3.50 a gallon. The calculator shows you will use 12 gallons, the trip will cost $42.00, and your cost per mile is $0.14. Driving that same trip in a higher-efficiency car at 40 MPG would need just 7.5 gallons (300 ÷ 40) and cost only $26.25 — a saving of $15.75.
Common use cases
- Budgeting the fuel for a road trip, vacation or long-distance move.
- Estimating the weekly cost of a daily commute to compare with transit or rideshare.
- Splitting gas fairly with passengers or fellow drivers on a shared trip.
- Calculating a fuel cost-per-mile figure for business mileage reimbursement.
Pro tips
- Use your real-world MPG rather than the sticker number for a more accurate estimate.
- Gas prices vary by state and region, so enter the price where you will actually fill up.
- The cost per mile is the best number for comparing two vehicles side by side.
- Add tolls, parking and maintenance to get the full cost of driving the trip.
FAQ
How do I calculate fuel cost for a trip?
Divide the trip distance by your MPG to get gallons used, then multiply by the gas price per gallon. For 300 miles at 25 MPG and $3.50 gas, that is 12 gallons × $3.50 = $42.
How many gallons will I use?
Divide the miles you plan to drive by your car's fuel economy. Driving 300 miles in a 25 MPG car uses 300 ÷ 25 = 12 gallons of gas.
How do I calculate the cost per mile for gas?
Divide the gas price per gallon by your MPG. At $3.50 a gallon and 25 MPG, the cost per mile is $3.50 ÷ 25 = $0.14, or 14 cents a mile.
What MPG should I use for this estimate?
Use your car's real-world MPG from the fuel economy window sticker or an MPG calculation, since highway and city driving give different results.
How accurate is this fuel cost estimate?
It is exact for the inputs you give. Real costs vary with actual gas prices, driving habits, traffic and terrain, so treat it as a close estimate.
How much gas does a car use in 100 miles?
Divide 100 by your MPG. A 25 MPG car uses 4 gallons to go 100 miles, while a 40 MPG car uses 2.5 gallons. At $3.50 gas that is $14 versus $8.75.
How can I reduce fuel cost on a road trip?
Plan a fuel-efficient route, keep a steady speed, avoid heavy loads, check tire pressure, and fill up where gas is cheapest to cut your total fuel cost.
How do I add a fuel cost per mile to a business claim?
Multiply your cost per mile by the miles driven for the trip. Use the figure this calculator returns as your per-mile fuel cost line for reimbursement.
Why does distance divided by MPG give gallons?
MPG means miles per gallon, so dividing total miles by miles per gallon cancels the miles and leaves the gallons of fuel used for that distance.
Is this fuel cost calculator free and private?
Yes. It is completely free, runs entirely in your browser, and nothing you enter is uploaded.
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