Estimate fuel cost for any road trip based on distance, MPG, and gas price. Plan your trip budget with this free calculator.
Planning a road trip? This calculator estimates the total fuel cost based on your trip distance, vehicle's fuel economy, and current gas prices. It also tells you how many gallons you'll need and how many fuel stops to expect.
Road trip fuel costs can add up quickly. A 1,000-mile trip in a vehicle getting 25 MPG at $3.50/gallon costs $140 in fuel alone. A round trip doubles that to $280. Knowing this upfront helps you budget accurately and decide whether driving or flying makes more sense.
Enter your one-way distance or round-trip total, your vehicle's MPG, and the expected fuel price to get an instant cost estimate. Use highway MPG for interstate trips and combined MPG for routes with city driving.
Whether you drive a compact sedan, a full-size SUV, or a pickup truck, accurate trip fuel cost figures help you plan smarter and avoid costly surprises at the pump or dealership. Use this tool regularly to track changes over time and adjust your transportation budget accordingly.
Accurate trip cost estimates help you budget for vacations, compare driving vs. flying, split fuel costs with passengers, and decide which vehicle to take on a multi-car household road trip. It takes the guesswork out of trip planning. Results update instantly as you adjust inputs, making it easy to explore different scenarios and find the best option for your driving needs and budget.
Trip Fuel Cost = (Trip Distance ÷ MPG) × Fuel Price Per Gallon
Result: $93.33 fuel cost
An 800-mile trip at 30 MPG: gallons needed = 800 ÷ 30 = 26.7. Fuel cost = 26.7 × $3.50 = $93.33. With a 15-gallon tank, plan for about 2 fuel stops.
Fuel is the biggest variable cost of a road trip, but don't forget tolls ($20–$100+ on East Coast routes), food ($30–50/day per person), and lodging ($80–$150/night). A 2,000-mile round trip might cost $200 in fuel but $500+ in total.
At 28 MPG and $3.50/gallon: 200 miles = $25, 500 miles = $63, 1,000 miles = $125, 2,000 miles = $250, 3,000 miles = $375. Double for round trips. Add 10% for a comfortable buffer.
Maintain a steady 60–65 mph on highways for best efficiency. Use cruise control. Keep windows up at highway speeds (use AC instead). Remove roof racks if not needed. Inflate tires to the recommended pressure before departure.
A $250 trip split among 4 passengers is $62.50 each. The same trip by air might cost $200–$400 per person. For families and groups, road trips are almost always the more economical choice, especially with a fuel-efficient vehicle.
Use highway MPG for trips that are mostly interstate. For routes through towns and cities, use the combined EPA rating. If your trip mixes both, highway MPG is usually closer since most road trip miles are at highway speeds.
This is a good baseline estimate. Real-world costs may be 5–15% higher due to detours, traffic, speed variations, wind, and altitude changes. Roof cargo, towing, and AC use also increase fuel consumption beyond the estimate.
Divide the gallons needed by your tank size (minus a 2-gallon reserve). A 15-gallon tank with 2-gallon reserve gives 13 usable gallons. If you need 30 gallons total, plan for 30/13 = about 2–3 stops.
For 1–2 people, flying is often cheaper on trips over 500 miles one-way when you factor in fuel, hotels, food, and time. For 3+ people sharing one car, driving is usually cheaper. This calculator helps quantify the fuel portion of the comparison.
Yes significantly. Driving at 75 mph uses about 15–25% more fuel than 60 mph due to aerodynamic drag increasing with the square of speed. Slowing from 80 to 65 mph on a 500-mile trip can save $15–$25 in fuel.
Check GasBuddy or AAA for state-by-state prices. States like Texas, Oklahoma, and Mississippi tend to have lower prices; California, Washington, and Illinois tend to be higher. Use an average of the states you'll pass through.