Fuel cost of a drive one way or there and back, in miles or kilometres
Estimates only, not financial advice. What you type stays on your device. Checked against sources on 1 Oct 2026.A trip's fuel cost is the distance divided by the fuel economy, times the fuel price, doubled when you drive back. A 150-mile visit there and back at 25 MPG with gas at $3.40 uses 12 gallons and costs $40.80. Switch to kilometres and L/100 km or km/L if your car reports those.
| Miles one way | One way | There and back |
|---|---|---|
| 25 | $3.40 | $6.80 |
| 50 | $6.80 | $13.60 |
| 100 | $13.60 | $27.20 |
| 150 | $20.40 | $40.80 |
| 250 | $34.00 | $68.00 |
| 400 | $54.40 | $108.80 |
| 600 | $81.60 | $163.20 |
The page opens with Round trip on, so the one-way distance is doubled.
Enter the "Distance, one way" to your destination.
Enter the Fuel economy and today's fuel price.
Read the Round trip cost and the Fuel used there and back.
The cost of a drive comes down to three numbers: how far, how much fuel the car uses for that distance, and what the fuel costs. This calculator takes them in whichever units your car and your country use, and gives the trip cost, each person's share and the cost per mile and per kilometre. Round trip doubles the one-way distance: 150 miles there and back at 25 MPG, with gas at $3.40, uses 12 gallons and costs $40.80.
Units. Choose miles with MPG and a price per U.S. gallon, kilometres with litres per 100 km, or kilometres with km per litre. Switching converts the figures already entered, so the trip stays the same trip. The conversions use the U.S. gallon of 231 cubic inches (3.785411784 litres) and the mile of 1.609344 km, both exact definitions in NIST Handbook 44. A UK MPG figure uses the larger Imperial gallon and is about 20% higher than the U.S. figure for the same car, so convert it to L/100 km before entering it.
MPG from a fill-up. Fill the tank, reset the trip meter, drive, and fill again: the distance divided by the fuel added is your real-world economy. Enter both and the page shows it as MPG, L/100 km and km/L, ready to use for the trip.
The rest of the article, and all 6 questions about Fuel Cost Calculator, are on the Fuel Cost Calculator page.
Divide the distance by the car's miles per gallon to get the gallons used, then multiply by the price per gallon. A 300-mile drive at 30 MPG needs 10 gallons, and at $3.50 a gallon that is $35.00. Double it for a round trip, and divide by the number of people sharing the cost.
Fill the tank to the top and reset the trip meter. Drive normally, then fill up again and note the gallons added. Miles driven divided by gallons added is the real MPG: 330 miles on 11 gallons is 30 MPG. Averaging several tanks gives a steadier figure than a single one.
Multiply the distance by the car's energy use and the electricity price. At 30 kWh per 100 miles, 300 miles takes 90 kWh, which costs $15.30 at 17 cents per kWh. Public fast chargers often cost several times the home rate, so enter the price you will actually pay.
No. The figure covers fuel or electricity only. Tolls, parking, tyres, servicing, depreciation and insurance all add to the real cost of driving, and the IRS standard mileage rate is one published estimate of that total. Add tolls and parking to the result yourself when splitting a road trip.
Rates and rules change; check the source before you rely on a figure.
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