Road Trip Cost Calculator
Trip Fuel & Cost Summary
In the United States, gasoline is measured in US liquid gallons (3.785 liters). An average modern vehicle achieves between 25 and 32 MPG on the highway.
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How it works
Input your trip distance in miles (or select a popular road trip preset).
Enter your vehicle's fuel economy in MPG and the current price per gallon of gas.
Adjust passenger split count and optional toll fees to see total trip costs and cost per traveler.
Frequently asked questions
How do I calculate my car's actual MPG?
Fill your tank completely, reset your trip odometer, drive normally, and refill again. Divide the miles driven by the gallons required to refill the tank.
How many liters are in a US liquid gallon?
One US liquid gallon equals exactly 3.78541 liters.
Is this tool free?
Yes. The site is supported by ads, so you never pay or need to create an account.
Does it work on mobile?
Yes. The page adapts to your screen and does not require installing any app.