Fuel Cost Calculator
Work out the gas cost for any road trip from distance, MPG and fuel price.
Calculate your fuel cost
Your fuel cost
Fuel cost for different distances
Same MPG and fuel price, at distances from 50 to 1000 miles one way. Your entered distance is highlighted.
How fuel cost works
This free fuel cost calculator works out the gas cost for any road trip from distance, miles per gallon and fuel price. It is for drivers, families and friends planning a road trip or splitting fuel fairly. There is no sign-up, and it runs entirely in your browser, so your trip stays private.
How do you calculate fuel cost for a trip?
Divide the distance by the miles per gallon to find the gallons you need, then multiply the gallons by the price per gallon. For a 300 mile trip at 30 miles per gallon, you need 10 gallons, and at 3.50 dollars per gallon the trip costs 35 dollars. This calculator uses exactly that formula.
How much does it cost per mile to drive?
In 2024, the U.S. Energy Information Administration reported that the average price of regular gasoline in the United States was about 3.30 dollars per gallon. At 30 miles per gallon, that works out to about 11 cents per mile for fuel alone. Divide your fuel price by your miles per gallon to find your own cost per mile.
What is a good miles per gallon?
Most petrol cars return between 25 and 35 miles per gallon, while many hybrids reach 40 to 50 miles per gallon or more. Small cars use less fuel than large SUVs and pickup trucks, and driving at a steady speed helps. Enter your real miles per gallon from your last few fill-ups for the most accurate trip cost.
How do you work out the cost of a round trip?
Tick the round trip option and the calculator doubles the distance before it works out the gallons and the cost. A 300 mile one-way trip becomes 600 miles there and back, so the fuel cost doubles too. If you are driving a different route home, work out each leg on its own and add the two costs together.
How do you split fuel cost between passengers?
Divide the total fuel cost by the number of people in the car, including the driver, so everyone pays the same share. For a 35 dollar trip with 2 people, each person pays 17.50 dollars. Enter the passenger count in the calculator and it shows the cost per person beside the total trip cost.
Worked example
A 300 mile trip at 30 miles per gallon needs 10 gallons of fuel. At 3.50 dollars per gallon, the trip costs 35 dollars, which is 0.117 dollars per mile. With 2 passengers, each person pays 17.50 dollars. The table above shows the same car and fuel price at distances from 50 to 1000 miles, so you can compare a short drive with a long road trip.
Frequently asked questions
How much gas will I use for 300 miles?
Divide 300 by your miles per gallon. At 30 MPG you need 10 gallons, at 25 MPG you need 12 gallons, and at 40 MPG you need 7.50 gallons.
How do I work out cost per mile?
Divide the fuel price per gallon by your miles per gallon. At 3.50 dollars per gallon and 30 MPG, the cost is 0.117 dollars per mile. Multiply that by any distance to get the fuel cost.
What MPG should I enter?
Enter your real average MPG from your last few fill-ups, not the maker’s best figure. Divide the miles you drove by the gallons you bought, and use that number for the most honest trip cost.
Does this calculator include tolls and parking?
No. It covers fuel only. Add tolls, parking and food separately to your trip budget, because those costs change a lot from one route to another.
Can I use kilometres and litres?
This calculator uses miles, gallons and dollars. For a metric trip, convert first: 1 mile is 1.609 kilometres, and 1 gallon is 3.785 litres, then enter the converted distance and price.
Is this fuel cost calculator free?
Yes. It is free, with no sign-up, and it runs entirely in your browser. Nothing you type is uploaded or stored.
How do I split the fuel cost with friends?
Enter the number of passengers, including the driver, and the calculator shows the cost per person. For a 35 dollar trip with 2 people, each person pays 17.50 dollars.
More tools you may need
Splitting a meal after the trip? Use our Tip Calculator and Bill Splitter. Working out a work trip? Our Meeting Cost Calculator works out what a meeting costs, and the VAT Calculator adds or removes VAT from any price.
