Step by step
- Enter your one-way distance in miles, your car's MPG, and the gas price per gallon.
- Type your one-way toll total into the Tolls ($) field.
- Tick Round trip if you are driving back, and tick Tolls each way if the return route has the same tolls.
- Check the Trip cost and per-person share at the bottom.
At a glance
| Trip type | How tolls are counted | Result |
|---|---|---|
| One-way trip | One-way tolls added once | Fuel + 1× tolls |
| Round trip, same tolls | Tick Tolls each way | 2× fuel + 2× tolls |
| Round trip, one-way toll | Leave Tolls each way unticked | 2× fuel + 1× tolls |
Related questions
Does the calculator include tolls in the cost per person?
Yes, the per-person share divides the combined total of fuel and tolls by the number of people you enter.
What if tolls are different on the return trip?
Leave Tolls each way unticked and enter the combined total of outbound and return tolls in the Tolls ($) field.
Where can I find highway toll costs before my trip?
Check your state's turnpike or toll authority website, or enable toll estimates in your navigation app before entering the total here.
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Open the full gas cost calculator →
Updated November 14, 2026.