Road Trip Cost Calculator — fuel cost and split

How it works

The fuel for a trip depends on how far you drive, how thirsty the car is, and the price of gas. Divide the distance by the fuel economy to get the gallons used, then multiply by the price:

total cost = (distance ÷ MPG) × price per gallon

This is the same method the EPA uses on the fuel-economy label — miles driven ÷ MPG × price per gallon. Switch on round trip to count the drive home, which simply doubles the distance. To share the cost, divide the total among everyone in the car:

cost per person = total cost ÷ travelers

Only fuel is counted here. A real trip budget also includes food, lodging, tolls and wear, but fuel is usually the biggest variable, and it is the part that scales directly with distance and gas price.

Worked example

A 250-mile each-way weekend trip is a 500-mile round trip. At 30 MPG that is 500 ÷ 30 = 16.7 gallons; at $3.70 a gallon the fuel is about $61.67. Split between 2 people, that is about $30.83 each. An 800-mile round trip in a 20 MPG SUV at $4.00 costs $320, or $80 each for four.

Frequently asked questions

How do I calculate the cost of a road trip?

Divide the trip distance by your car's MPG to get the gallons, then multiply by the gas price: cost = (distance ÷ MPG) × price per gallon. For a round trip, double the distance first. A 500-mile round trip at 30 MPG and $3.70 costs about $61.67 in fuel.

How much gas will I use on a trip?

Divide the total distance by your fuel economy in miles per gallon. A 500-mile drive at 30 MPG uses 500 ÷ 30 ≈ 16.7 gallons. Highway driving usually beats the city MPG, so a long trip often does a little better than the combined rating.

How do I split gas money for a road trip?

Add up the total fuel cost, then divide by the number of people sharing it: cost per person = total ÷ travelers. For $61.67 of gas split between two people, each owes about $30.83. The driver's wear-and-tear is sometimes shared too, but that is a separate agreement.

Does this include the drive home?

Only if you turn on the round-trip option, which doubles the one-way distance. Leave it off to cost a single leg — useful for a one-way move or a trip where you are not driving back. You can also just enter the total miles directly with round trip off.

Why use MPG instead of a fixed cost per mile?

Because fuel cost per mile changes with both the car and the price of gas, MPG plus the current price captures your actual situation. A 20 MPG SUV costs more than twice as much per mile as a 45 MPG hybrid at the same gas price, and every trip cost moves with the pump price.

Is fuel the only cost of a road trip?

No — lodging, food, tolls, parking and vehicle wear all add up, and can exceed fuel on a long trip. This calculator isolates the fuel, which is the part that scales cleanly with distance, fuel economy and gas price; budget the rest separately.