# What will this trip cost in gas?

Enter the distance, your car's MPG and the gas price. See the fuel cost one way, round trip and per person.

 Distance (miles, one way)
 Car MPG
 Gas price ($ per gallon)
 People splitting
 Trip

The values filled in are examples. Highway MPG is usually higher than the city figure; a loaded car or roof box costs 5–20%.

## Fuel for this trip

## How it works

Gallons used are miles ÷ MPG, and the cost is gallons × the gas price. A round trip doubles the miles. Splitting divides the total by the number of people.

Don't know your MPG? Work it out from a fill-up with the [gas mileage calculator](https://sharpest.ai/tools/gas-mileage), or compare an electric car with the [EV charging cost calculator](https://sharpest.ai/tools/ev-charging-cost).

## Questions

### How do I calculate gas cost for a road trip?

Divide the distance by your car's MPG to get gallons, then multiply by the price per gallon. A 600-mile round trip in a 30 MPG car at $3.20 a gallon uses 20 gallons and costs $64.

### Should I use city or highway MPG?

Use highway MPG for long trips on interstates and the combined figure for mixed driving. Speeds above 65 mph, a full load, a roof box or towing all cut real mileage, so add 10% to the estimate if any apply.

### How should friends split gas money?

Split the fuel cost evenly between everyone in the car, driver included, or leave the driver out if they also cover tolls, parking and wear on the car. Enter the number of people above to get each share.

### Is it cheaper to drive or fly?

For one person, flying often wins past about 500 miles once you count gas, tolls and a night in a hotel. For three or four people splitting fuel, driving usually stays cheaper well beyond that.

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As of 2026-11-12. Canonical page: https://sharpest.ai/tools/fuel-cost