Road Trip Cost Calculator
Estimate the total fuel cost for your next road trip.
How is road trip fuel cost calculated?
To estimate your road trip's gas cost, divide your total trip distance by your car's MPG to find the gallons of fuel needed, then multiply that by the current price per gallon. For example, a 500-mile trip in a car that gets 28 MPG needs about 17.9 gallons, which at $3.50 per gallon comes out to roughly $62.50 in fuel for the one-way trip. This calculator also splits that cost evenly if you're traveling with friends or family, and doubles it automatically to show what a round trip would cost.
What other costs should you budget for on a road trip?
Fuel is usually the biggest controllable expense on a road trip, but tolls, parking, food, and lodging can add up quickly on longer trips. If you're driving through multiple states, tolls alone can add $20-100 depending on your route, and it's worth checking toll calculators for major highways in advance. Overnight stays typically run $80-200 per night depending on the region, so factor those into your total trip budget beyond just gas.
Tips to reduce your road trip fuel costs
Driving at a steady 55-65 mph rather than aggressively accelerating and braking can improve fuel economy by 15% or more on the highway. Keeping tires properly inflated, removing roof racks or excess cargo weight when not needed, and using apps to find the cheapest gas stations along your route are all simple ways to shave dollars off your total trip cost, especially on longer journeys.
Frequently Asked Questions
How much gas will I need for my road trip?
Divide your total trip distance by your car's MPG to get the gallons of gas needed. For example, a 500-mile trip in a car averaging 28 MPG requires about 17.9 gallons of fuel for the one-way distance.
How do I split gas costs fairly with friends?
The simplest fair method is dividing the total fuel cost evenly by the number of people in the car, regardless of who's driving. This calculator does that automatically — just enter the number of people splitting the cost to see each person's share.
Does this calculator include the return trip?
The main result shows the one-way fuel cost based on your entered distance. We also show a round-trip estimate in the breakdown section, which simply doubles the one-way fuel cost, assuming you drive the same distance back.
What other costs should I budget for besides gas?
Beyond fuel, budget for tolls, parking, lodging if it's a multi-day trip, food, and any entrance fees for attractions along the way. Tolls and lodging in particular can sometimes exceed your total fuel cost on long interstate trips.
How can I find my car's actual MPG for a more accurate estimate?
Fill your tank completely, reset your trip odometer, then divide the miles driven by the gallons used at your next fill-up. Using your real-world MPG instead of the manufacturer's estimate gives a more accurate road trip cost.
Is it cheaper to drive or fly for a road trip distance?
It depends on the distance, number of travelers, and flight prices, but for trips under about 500-700 miles with multiple passengers, driving is often cheaper once you factor in airport parking, baggage fees, and rental cars at your destination.
How does gas price affect my total road trip cost?
Gas prices vary significantly by state and region, sometimes by $1 or more per gallon. On a long trip, checking gas price apps and filling up in cheaper states along your route can meaningfully reduce your total fuel cost.
How can I reduce fuel costs on a long drive?
Drive at a steady speed rather than accelerating and braking often, keep tires properly inflated, remove unnecessary roof cargo that increases drag, and use gas price comparison apps to find the cheapest stations along your route.