How Does This Calculator Work?
The calculator doubles your one-way distance to get the round trip, divides by your vehicle's MPG to find gallons needed, multiplies by the gas price, then adds any additional costs like tolls or parking you enter.
Planning a road trip? This calculator estimates round-trip fuel cost from your one-way distance, vehicle fuel economy, and gas price — plus any additional costs like tolls you want to add in.
Example Calculation
Weekend Road Trip Example
300 miles one-way, 30 mpg, $3.50/gal gas, $20 in tolls.
((300×2)/30)×3.50+20 = $90 estimated total cost.
Tips
Check average gas prices along your actual route, since prices can vary significantly by state — a national average may understate cost on a route through higher-price regions.