How this calculator works
Gallons used = miles ÷ miles per gallon. Multiply by the price per gallon for the cost, and divide by the number of people sharing the ride.
Gallons = Miles ÷ MPG
Cost = Gallons × Price per gallon
Worked example
Using the default values in the calculator above:
| Input | Value |
|---|---|
| Distance (one way) | 300 miles |
| Trip | Round trip |
| Fuel economy | 28 mpg |
| Gas price | 3.2 $/gal |
| Split between | 1 people |
| Result | Value |
|---|---|
| Fuel cost | $68.57 |
| Per person | $68.57 |
| Gallons needed | 21.4 gal |
| Total miles | 600 mi |
| Cost per mile | $0.114 |
Step by step:
- Miles = 300 × 2 = 600
- Gallons = 600 ÷ 28 mpg = 21.43
- Cost = 21.43 × $3.2 = $68.57
Common mistakes to avoid
- Using the city MPG for a highway trip, or the highway MPG when towing or carrying a roof box.
Frequently asked questions
How much does a 600-mile road trip cost in gas?
At 28 mpg and $3.20 a gallon, about 21.4 gallons, or $68.57.