Road Trip Gas & Fuel Cost Calculator

Calculating road trip fuel costs helps travelers budget vehicle gas expenses, divide costs fairly among carpoolers, and evaluate route alternatives.

To use the Road Trip Gas & Fuel Cost Calculator, enter your Total Trip Distance, Vehicle Fuel Economy, Fuel Price per Gallon and other values. The calculator instantly computes Total Trip Gas Cost, Total Fuel Needed and more. Results update in real time as you change any input — no submit button needed.

How to Use This Calculator

Enter your Total Trip Distance (e.g. 400 in miles), Vehicle Fuel Economy (e.g. 25.0 in MPG), Fuel Price per Gallon (e.g. 3.50 in /gallon), and Number of Passengers Sharing Cost (e.g. 1 in passengers). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Total Fuel Needed (gallons) = Trip Distance (miles) ÷ Vehicle MPG

Total Gas Cost () = Total Fuel Needed × Fuel Price per Gallon (/gal)

Cost per Passenger () = Total Gas Cost ÷ Passengers Count

Worked Example

400-mile road trip in a 25 MPG vehicle at 3.50/gallon with 4 passengers:

Total Fuel Needed = 400 / 25 = 16.0 gallons.

Total Gas Cost = 16.0 × 3.50 = 56.00 (14.00 per passenger | 0.14 per mile).

Understanding Your Result

US EPA fuel economy benchmarks: Compact cars average 28–35 MPG combined; midsize SUVs 22–28 MPG; pickup trucks 16–22 MPG; hybrid vehicles 40–55 MPG; battery EVs equivalent 90–120 MPGe. Real-world fuel economy typically runs 10–20% below EPA ratings due to driving style, cold weather (reduces efficiency 15–25%), AC use (reduces efficiency 5–25%), and cargo weight. At 3.50/gallon, a 5 MPG improvement over 15,000 annual miles saves approximately 450/year.