Fuel Cost Calculator
Trip fuel cost from distance, economy and price.
Enter your values
Enter the trip distance in miles.
Enter the fuel economy in mpg.
Enter the fuel price in $/gal.
Enter the split between in people.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Total fuel cost
- $45.28
- Fuel needed
- 13.13 gallons
- Cost per person
- $45.28
- Cost per mile
- $0.108
- Round trip
- $90.56
Quick answer
Trip fuel cost is distance ÷ fuel economy × price per gallon or litre.
Cost = distance ÷ mpg × price
At a glance
| What it does | Trip fuel cost from distance, economy and price. |
|---|---|
| Category | Auto |
| Inputs needed | Trip distance, Fuel economy, Fuel price, Split between |
| Main output | Total fuel cost |
| Formula | Cost = distance ÷ mpg × price |
| Cost | Free — no sign-up, no download |
How to use the Fuel Cost Calculator
- 1Enter the trip distance.
- 2Enter your vehicle's real-world mpg.
- 3Add the current fuel price.
Inputs explained
- Trip distance(miles)
- Enter the trip distance in miles.
- Fuel economy(mpg)
- Enter the fuel economy in mpg.
- Fuel price($/gal)
- Enter the fuel price in $/gal.
- Split between(people)
- Enter the split between in people.
Worked example
Using the values the calculator loads with:
Inputs
- Trip distance420 miles
- Fuel economy32 mpg
- Fuel price3.45 $/gal
- Split between1 people
Results
- Total fuel cost$45.28
- Fuel needed13.13 gallons
- Cost per person$45.28
- Cost per mile$0.108
- Round trip$90.56
Frequently asked questions
Should I use the sticker mpg?
Use your own recent average — real-world economy is often 10–20% below the official figure, especially in city driving.
How do I convert L/100km to mpg?
Divide 235.2 by the L/100km figure to get US mpg.
What do I need to enter into the Fuel Cost Calculator?
Just 4 values: trip distance, fuel economy, fuel price, split between. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Fuel Cost Calculator work out the answer?
Trip fuel cost is distance ÷ fuel economy × price per gallon or litre. It applies the formula Cost = distance ÷ mpg × price and shows the working so you can check each step by hand.
Is the Fuel Cost Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.