You enter the trip distance, your vehicle's fuel efficiency, and the fuel price. The calculator converts all inputs into a common unit system (miles and gallons), divides distance by efficiency to get fuel volume, then multiplies by price to get total cost. If round trip is selected, the distance is doubled before calculating. It assumes constant efficiency over the entire trip — no adjustments for city vs. highway, altitude, or temperature.
Check the sticker on your driver's door jamb, your owner's manual, or look up your vehicle at fueleconomy.gov. The EPA combined rating is a reasonable starting point, though real-world driving often gets 5–15% lower.
For mostly highway road trips, use the highway rating. For mixed driving, use the combined figure. City-only trips should use the city rating. If unsure, the combined number is the safest bet.
Yes, significantly. Most vehicles hit peak efficiency between 45–65 mph. Above 65, aerodynamic drag increases sharply — each 5 mph over 50 is roughly equivalent to paying an extra $0.20–$0.30 per gallon, according to the DOE.
It provides a solid ballpark. Real trips include elevation changes, speed variation, AC use, and cargo weight that all shift actual consumption. Budget 10–15% more than the calculator shows for safety.
Estimate only. Results reflect your inputs and standard formulas — they are not financial, tax, legal, health, or investment advice. Verify important decisions with a qualified professional.