Road Trip Gas Cost Calculator
Total fuel cost for a road trip.
Enter your values
Enter the trip distance (round trip) in mi.
Enter the vehicle mpg you are working with.
Enter the gas price per gallon you are working with.
Enter the number of people splitting cost you are working with.
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 gas cost
- $96.00
- Gallons needed
- 26.7 gal
- Cost per person
- $96.00
Quick answer
Total gas cost is trip distance divided by your car's MPG, times the price per gallon.
cost = (distance / mpg) x gas price
At a glance
| What it does | Total fuel cost for a road trip. |
|---|---|
| Category | Auto |
| Inputs needed | Trip distance (round trip), Vehicle MPG, Gas price per gallon, Number of people splitting cost |
| Main output | Total gas cost |
| Formula | cost = (distance / mpg) x gas price |
| Cost | Free — no sign-up, no download |
How to use the Road Trip Gas Cost Calculator
- 1Enter the total round-trip distance in miles.
- 2Enter your vehicle's average MPG and current gas price along the route.
- 3Split the total among travelers to see the cost per person.
Inputs explained
- Trip distance (round trip)(mi)
- Enter the trip distance (round trip) in mi.
- Vehicle MPG
- Enter the vehicle mpg you are working with.
- Gas price per gallon
- Enter the gas price per gallon you are working with.
- Number of people splitting cost
- Enter the number of people splitting cost you are working with.
Worked example
Using the values the calculator loads with:
Inputs
- Trip distance (round trip)800 mi
- Vehicle MPG30
- Gas price per gallon3.60
- Number of people splitting cost1
Results
- Total gas cost$96.00
- Gallons needed26.7 gal
- Cost per person$96.00
Frequently asked questions
Should I account for highway vs city MPG?
Yes, use your car's highway MPG rating for long road trips since most driving will be at steady highway speed.
Does this include tolls?
No, this covers fuel only — add tolls, food and lodging separately for a full trip budget.
What do I need to enter into the Road Trip Gas Cost Calculator?
Just 4 values: trip distance (round trip), vehicle mpg, gas price per gallon, number of people splitting cost. 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 Road Trip Gas Cost Calculator work out the answer?
Total gas cost is trip distance divided by your car's MPG, times the price per gallon. It applies the formula cost = (distance / mpg) x gas price and shows the working so you can check each step by hand.
Is the Road Trip Gas 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.