Fuel Cost Calculator
Punch in the miles, your car's MPG, and today's pump price to see what a trip actually costs to drive.
How it works
The math is short: divide the distance by your MPG to get the gallons you'll burn, then multiply by the price per gallon. A 300-mile drive at 28 MPG needs about 10.7 gallons, so at $3.45 that's roughly $37.
Your real-world MPG is usually a bit below the sticker number, especially on short hops or in cold weather. If you track fill-ups, use your own average — it'll get you closer than the EPA figure.
The cost-per-mile number is handy for comparing routes or deciding whether a longer highway detour actually saves money once the extra fuel is counted.
Frequently asked questions
How do I figure the gas cost of a trip?
Divide the trip distance by your miles per gallon to get gallons used, then multiply that by the price per gallon. Enter the three numbers and the calculator does it and shows the cost per mile too.
What MPG should I use?
Your own tracked average beats the window sticker. If you don't have one, use the EPA combined rating for your car, then trim it a little for lots of city driving, a roof box, or winter temperatures.
Does this work for a round trip?
Enter the total distance you'll actually drive. For a round trip, double the one-way miles first, or just type the full there-and-back number into the distance field.
Why is my cost higher than expected?
Aggressive acceleration, highway speeds above 65, heavy loads, and idling all drop real MPG below the rated figure. Lowering the MPG you enter to match your driving gives a more honest total.