Gas Trip Cost Calculator
Enter your trip distance, vehicle's fuel economy, and the price of gas to calculate the total fuel cost.
Last updated: August 30, 2026
Frequently asked questions
How do I calculate the cost of gas for a road trip?
Divide the trip distance by your vehicle's miles-per-gallon rating to get gallons needed, then multiply by the price per gallon. A 300-mile trip at 28 mpg and $3.50/gallon needs about 10.7 gallons, costing roughly $37.50.
Should I use city or highway mpg for a road trip estimate?
Highway mpg is usually the more accurate figure for a long-distance trip, since most of the driving happens at steady highway speeds; city mpg (typically lower) is more relevant for trips with frequent stops and lower average speeds.
How can I split this cost among passengers?
Divide the total gas cost by the number of people sharing the trip - for a $37.50 total split 3 ways, that's $12.50 per person. This calculator gives you the total cost; dividing it evenly (or by another agreed split) is a simple next step.
Is 'calculating gas costs for a trip' the same as this calculator?
Yes - enter your trip distance, fuel economy, and gas price above to calculate exactly that.
Is a 'gas calculator for a trip' the same as this tool?
Yes - that's exactly what this calculator does, using your trip distance, fuel economy, and gas price.