Road trip budget
Add food, hotels, tolls, and activities.
Free gas trip calculator
Calculate your road trip gas cost.
Add one or more trip legs, your MPG, and a gas price. Get fuel cost by leg, the trip total, and what each person should pay.
- Free to use
- No sign-up
- Your numbers stay here
Free gas trip calculator
Price your drive
Trip estimate$39.43
Each person$19.71
Your estimated trip cost
$39.43One way · 1 leg · 320 miles
- Gas you will need
- 11.4 gal
- Gas cost
- $39.43
- Cost per mile
- $0.12
Each person pays$19.71
This is an estimate. Traffic, driving style, and pump prices can change the real cost.
No tricky math
How to calculate gas cost for a trip
Add each part of your drive, your car’s MPG, and the price per gallon. We show every part of the estimate so you can check it.
- 1
Add your trip legs
Use one leg for A → B and another for B → C.
- 2
Add your car’s MPG
Higher MPG means your car uses less gas.
- 3
Add the gas price
Use the price you expect to pay per gallon.
The formula
total leg miles ÷ MPG × gas price = fuel cost
Example: 320 miles ÷ 28 MPG × $3.45 = $39.43
What this estimate assumes
Your MPG and gas price stay the same for every leg. Costs are split equally. Tolls, parking, food, and hotels only count when you add them.
More tools are coming
More road trip calculators
Road Trip Tools is growing into a small set of useful travel calculators—not a wall of confusing links.
Commute cost
See your weekly, monthly, and yearly cost.
MPG converter
Switch between MPG, km/L, and L/100 km.
Quick answers
Gas trip calculator FAQs
Simple answers to the questions people ask most when estimating road trip fuel costs.
How do I calculate gas cost for a trip?
Divide the trip miles by your vehicle’s MPG to estimate gallons. Multiply the gallons by the gas price. For example, 320 miles ÷ 28 MPG × $3.45 is about $39.43.
What MPG should I enter?
Use your car’s recent average MPG when you can. Highway MPG can be higher, but traffic, hills, weather, speed, and tire pressure can lower it.
Does round trip double the distance?
Yes. Choose Round trip when you expect to follow the same route home. The calculator doubles every leg before estimating gallons and cost.
Can I calculate a road trip with several stops?
Yes. Add one leg for each part of the drive, such as A → B and B → C. The result shows fuel cost per leg and for the full trip.
Can I split the road trip cost between passengers?
Yes. Set the number of people paying, including yourself. The calculator divides the full estimated trip cost equally.
Where does the suggested gas price come from?
It is the latest weekly U.S. average for regular gasoline published by the U.S. Energy Information Administration. It is only a shortcut—not a local or station price—so you can always type your own price.
Are tolls, parking, food, and hotels included?
Only when you add them. Open the optional-cost section and enter any extra amounts you want included in the total and per-person estimate.
Good to know
It’s an estimate, not a promise.
Your real cost can change with traffic, weather, hills, tire pressure, driving speed, and the price at the pump. Use your own recent MPG for the closest estimate.