Gas Trip Cost Calculator
Fuel cost for a trip, split among passengers if you're carpooling.
🔒 Runs entirely in your browser — nothing here is ever uploaded
About the Gas Trip Cost Calculator
Estimates the fuel cost for a trip from distance, your vehicle's fuel economy, and the current gas price — with an option to split the cost among passengers.
- Enter the one-way trip distance and whether it's round trip.
- Enter your vehicle's combined fuel economy (mpg) and the current gas price.
- Enter the number of people splitting the cost, if any.
- Read the total fuel cost and cost per person.
A 300-mile round trip (600 miles total) at 32 mpg and $4.08/gallon, split among 3 people: about $76.50 total fuel cost, or $25.50 per person.
This is a straight-line fuel-cost estimate — (distance ÷ mpg) × price per gallon — it doesn't model traffic, elevation, HVAC load, or driving-style effects on real-world mileage. Use your vehicle's combined mpg (window-sticker rating or your dashboard's actual trip average) rather than splitting city/highway separately. Splitting among passengers divides the total fuel bill evenly and doesn't account for who's actually driving. This doesn't include tolls, parking, or wear-and-tear — pair it with the Car Total Cost of Ownership Calculator for a fuller per-mile estimate.
- • Real-world mpg often runs somewhat below the window-sticker combined rating, especially with highway speeds, AC/heat use, or a loaded vehicle — use your dashboard's actual trip average if you have it for a more accurate estimate.
- • Gas prices vary significantly by state and even by station along a route — check prices at your actual likely fill-up points rather than relying on a single national average for a long trip.
- • This doesn't account for tolls, parking, or wear-and-tear — pair it with the Car Total Cost of Ownership Calculator for the fuller picture of what a trip really costs.