Gas for a road trip and each person’s share when friends split the fuel
Estimates only, not financial advice. What you type stays on your device. Checked against sources on 1 Oct 2026.A road trip's gas is the one cost friends split most. 4 people driving 600 miles each way at 28 MPG burn 42.9 gallons; at $3.50 a gallon that is $150.00, or $37.50 each. Enter the one-way distance, tick round trip and set how many are sharing.
| Miles each way | Gas in all | Each of 4 pays |
|---|---|---|
| 100 | $25.00 | $6.25 |
| 200 | $50.00 | $12.50 |
| 300 | $75.00 | $18.75 |
| 450 | $112.50 | $28.13 |
| 600 | $150.00 | $37.50 |
| 800 | $200.00 | $50.00 |
| 1,000 | $250.00 | $62.50 |
The page opens with Round trip on and 4 "People sharing the cost"; change the number of people.
Enter the "Distance, one way" for the whole route.
Enter the car's Fuel economy and the fuel price along the way.
Read what each person pays and the total, then press Share result to send it to the group.
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.
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.
Electric cars. Enter the car's energy use per 100 miles or 100 km and your price per kWh. Some energy is lost between the socket and the battery while charging; if you know the share for your charger, add it and the cost is worked out on the energy drawn from the wall.
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.
Still stuck? Ask about Fuel Cost Calculator and anybody who knows can answer. No account needed.
On the related tools: Step-up SIP Calculator – See how raising your SIP every year changes the final corpus · GST Inclusive Calculator – Split a price that already includes GST into value and tax.