Road Trip Cost Calculator
A road trip's biggest variable cost is usually the gas, and when several people share a car it helps to know what each person owes. This road trip cost calculator estimates the total fuel cost from the distance, your car's MPG, and the price per gallon, then divides it by the number of travelers for a fair per-person share. It is the figure to settle up with before you set off.
Calculate
Default result: $154.29
Road Trip Cost Calculator · Materials
calculators.dev
Total gas cost
1200 × 28 × 3.6 × 4
Shopping list
- Cost per person
- $38.57
Est. total
$154.29
Estimate — confirm w/ supplier · calculators.dev
Reviewed by the calculators.dev team · Last updated 2026-06-24
Formula reviewed against U.S. EPA / fueleconomy.gov — trip fuel from distance, MPG, and price per gallon
How to calculate
Enter the total trip distance — use the round-trip mileage if you are coming back — along with your car's MPG and the price per gallon, then how many people are splitting the cost. The calculator finds the gallons needed (distance ÷ MPG), multiplies by the price for the total, and divides by the travelers for each share. A 1,200-mile trip at 28 MPG and $3.60 per gallon is about $154.29 total, or $38.57 each between four people.
total gas cost = (distance ÷ MPG) × price per gallon. cost per person = total ÷ travelers. For 1,200 miles at 28 MPG and $3.60/gal: about 42.9 gallons × $3.60 ≈ $154.29 total, ÷ 4 ≈ $38.57 each.
Example calculation
A 1,200-mile road trip in a car that gets 28 MPG uses about 42.9 gallons. At $3.60 per gallon that is about $154.29 in gas, and split between 4 travelers it works out to about $38.57 each. Fewer miles, a thriftier car, or more passengers all lower the per-person share.
- tripCost
- $154.29
- perPerson
- $38.57
Assumptions
- Fuel economy is a single average figure; mountains, headwinds, and a loaded car all lower real MPG.
- The cost covers fuel only — tolls, food, lodging, and parking are not included.
- The split divides the total evenly among all travelers entered.
Common mistakes
- Entering one-way miles for a round trip — add the return distance to cover the whole journey.
- Using highway MPG for a trip with lots of city or mountain driving, which understates the gas cost.
- Forgetting the non-fuel costs of a trip, such as tolls and overnight stops, when budgeting.
Frequently asked questions
How do I calculate the gas cost of a road trip?
Divide the total distance by your car's MPG to get the gallons, then multiply by the price per gallon. A 1,200-mile trip at 28 MPG and $3.60/gal costs about $154.29 in fuel.
How should we split gas on a road trip?
A common approach is to divide the total fuel cost evenly by the number of travelers. This calculator does that for you — $154.29 between four people is about $38.57 each.
Should I enter one-way or round-trip distance?
Enter whatever distance you want costed. For a there-and-back trip, use the full round-trip mileage so the cost covers the return journey.
Does this include tolls and other costs?
No. It estimates fuel only. Add tolls, parking, food, and lodging separately when you budget the whole trip.