Trip Fuel Calculator. Plan Your Road Trip Fuel Cost.

You are mapping out a road trip, and the route looks great, but you have no idea how much you will actually spend on gas to get there. Maybe you are splitting the cost with three friends and need an exact number, not a rough guess. Either way, showing up at the gas station with no plan is how road trip budgets fall apart fast.

We built this trip fuel calculator so you know your exact fuel cost before you leave the driveway. Enter your trip distance, your vehicle MPG, and the gas price along your route. The calculator shows your total fuel cost, gallons needed, and cost per person if you are splitting the bill. No spreadsheet. No guessing at the pump.

Written by the FuelConsumptionCalc Research Team

Reviewed by William Taylor, Automotive Engineer, 12 years of experience in vehicle fuel efficiency testing.

Sources: EPA fuel economy data, Natural Resources Canada, AAA gas price reports, EIA energy statistics.

See our methodology page for how we verify every figure on this site.

Last Reviewed: June 2026

Free. No signup. Fuel stops + passenger split One way / round trip Mobile friendly
FormulaTrip Cost = (Distance ÷ MPG) × Gas Price  |  Fuel Stops = Distance ÷ (Tank × MPG)
One-way distance to destination
mi
 
MPG or L/100km
MPG
 
Average along your route
$/gal
 
To split cost evenly
people
For fuel stop estimate
gal
CompareSame trip, two vehicles. See which one saves you more on this route.
Same trip for both vehicles
mi
 
Same price for both
$/gal
 
MPG
MPG
people
Trip DistanceGallons Needed (28 MPG)Estimated Cost*
200 miles7.1 gallons$24.85
500 miles17.9 gallons$62.65
1000 miles35.7 gallons$124.95
2000 miles71.4 gallons$249.90

Example assumes $3.50 per gallon for illustration only. Use the calculator above with your own MPG and local gas price for an exact figure.

Trip Fuel Formula Explained

The trip fuel formula divides your total distance by your MPG to find gallons needed, then multiplies by gas price. Trip fuel cost equals distance divided by MPG, times gas price per gallon. The same formula works for any distance, from a 50 mile day trip to a 3,000 mile cross-country drive.

The Basic Formula

allons Needed = Trip Distance in Miles / MPG
Total Trip Cost = Gallons Needed x Gas Price Per Gallon
Cost Per Person = Total Trip Cost / Number of Passengers

If your trip uses kilometers and litres instead of miles and gallons, use
Our fuel unit converter switches formats before running the numbers above.

Worked Example for a Real Road Trip

A family drives from Dallas to Orlando, a distance of 1,070 miles, in an SUV averaging 24 MPG. Gas price along the route averages $3.45 per gallon for this example.

Gallons Needed = 1,070 / 24 = 44.6 gallons Total Trip Cost = 44.6 x $3.45 = $153.87 Cost Per Person (4 people) = $153.87 / 4 = $38.47 each

If the same family drove a minivan averaging 22 MPG instead, the same trip would cost $167.86, about $14 more for the same distance. Small MPG differences add up fast on long trips.

Calculate Fuel Stops Using Tank Size

Divide your tank capacity by your MPG to find your driving range per tank.
A 15 gallon tank at 28 MPG gives you a range of 15 x 28 = 420 miles before
you need to refuel.

On a 1,000 mile trip with that same setup:
1,000 miles / 420 mile range = 2.38, rounded up to 3 fuel stops

Most drivers stop sooner than their absolute range to avoid running close to empty, so plan for a stop every 300 to 350 miles as a safety buffer rather than waiting for the tank to hit empty. A smaller 12-gallon tank at the same 28 MPG only gives a 336-mile range, which means more frequent stops on the same 1,000-mile trip.

Fuel Needed for Common Road Trip Distances

Fuel needed scales directly with distance at a fixed MPG and gas price. A 500 mile trip at 28 MPG and an example gas price of $3.50 per gallon needs roughly 17.9 gallons, costing around $62.65. Use the table above as a quick reference, then calculate your exact figure with your own MPG and local gas price.

Short Trips Under 300 Miles

A 200 mile trip at 28 MPG needs about 7.1 gallons, costing roughly $24.85 at an example price of $3.50 per gallon. Most vehicles complete this distance on a single tank, so fuel stops are optional rather than necessary for most cars.

Medium Trips 300 to 800 Miles

A 500-mile trip needs about 17.9 gallons, costing around $62.65 at the same example price. Expect at least one fuel stop for most vehicles with a 12- to 16-gallon tank. This range covers most weekend getaways and regional family visits. For trips you take regularly, our monthly fuel cost calculator tracks the recurring total.

Long Trips Over 800 Miles

A 1,000 mile trip needs roughly 35.7 gallons, costing around $124.95. A 2,000 mile cross-country drive doubles that to about $249.90. Long trips benefit most from planning fuel stops in advance, since prices can vary by $0.50 or more per gallon between states.

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Fuel Cost as Part of Your Road Trip Budget

Fuel usually represents 25 to 40 percent of total road trip expenses for a typical multi-day trip. Accommodation, food, tolls, and parking make up the rest, and often add up to more than the fuel itself on longer trips. A family spending $150 on fuel for a 1,000 mile trip might also budget $300 to $500 for two nights of hotels, $150 to $250 for meals, and $20 to $40 for tolls depending on the route. Knowing your fuel cost first gives you the anchor number to build the rest of your road trip budget around, since it is usually the most predictable expense once you know your distance and MPG.

What Affects Your Trip Fuel Cost

Four factors shape your total trip fuel cost. Your vehicle’s MPG matters most over the full distance. Fuel stop timing, driving conditions, and vehicle load all influence the final number, sometimes by 10 percent or more across a long trip.

Vehicle MPG

A vehicle averaging 35 MPG costs roughly 20 percent less in fuel than one averaging 28 MPG over the same distance. Use our cost per mile calculator to compare vehicles before deciding which one to take on a long trip.

Number of Fuel Stops

Each fuel stop is an opportunity to find a cheaper price or get stuck with an expensive one. Highway exit stations near interstates often charge $0.20 to $0.40 more per gallon than stations a few miles into town. Planning ahead with a gas price app saves real money over a multi-stop trip.

Highway vs Mixed Driving

Steady highway driving at 60 to 65 mph typically gives better MPG than stop-and-go city driving. A vehicle rated at 28 MPG combined might achieve 32 to 34 MPG on a pure highway road trip. Our fuel consumption calculator helps you find your real highway MPG from your own trip data.

Cargo and Passenger Weight

A fully loaded vehicle with luggage and passengers can reduce MPG by 5 to 10 percent compared to driving empty. A roof box or cargo carrier adds aerodynamic drag and can reduce highway MPG by another 5 to 15 percent depending on size and speed.


How to Improve Your Towing MPG

Reduce speed, particularly above 55 mph, since this single change produces some of the largest fuel economy gains available while towing without any equipment changes. Distribute trailer weight properly, keeping tongue weight in the manufacturer-recommended range, since improper weight distribution increases drag and can force more frequent braking and acceleration that further hurt fuel economy.

Remove unnecessary cargo from both the tow vehicle and trailer, since every pound removed reduces the weight penalty slightly. Maintain correct tire pressure on both the tow vehicle and trailer before every towing trip. Use cruise control on flat highway stretches to maintain a steady speed rather than constantly accelerating, and plan routes that avoid unnecessary mountain grades when a flatter alternative route exists and timing allows.

Methodology

Towing MPG on this page is calculated using a weight-based penalty calibrated against published real-world towing MPG comparisons, combined with a terrain adjustment of 0 percent for flat, 20 percent for hilly, and 40 percent for mountainous terrain. Fuel cost and gallons needed use the standard formula: Fuel Cost = (Distance / Towing MPG) x Fuel Price Per Gallon.

Trailer weight class ranges referenced on this page reflect general industry patterns and published towing comparisons, not a guarantee for any specific tow vehicle and trailer combination. Real-world towing MPG depends on your specific vehicle, trailer aerodynamics, tire condition, terrain, weather, and driving style, and your own logged towing MPG from an actual trip will always be the most accurate figure for your setup.

Frequently Asked Questions

Divide your total trip distance in miles by your vehicle’s MPG to get the gallons needed. A 600-mile trip in a car averaging 30 MPG needs 600/30 = 20 gallons. Multiply gallons by your expected gas price to get the total cost. At an example price of $3.50 per gallon, that trip costs 20 x $3.50 = $70. This trip fuel calculator does the full calculation instantly once you enter your distance, MPG, and gas price.

At 28 MPG, a 500-mile trip uses 500/28 = 17.9 gallons. At 35 MPG, the same trip uses only 14.3 gallons. At an example price of $3.50 per gallon, that is a cost difference of $12.60 between the two vehicles for the identical 500 mile distance. Your exact gallons needed depend entirely on your specific vehicle’s MPG.

At 28 MPG, a 1,000-mile trip needs 1,000/28 = 35.7 gallons. At a typical gas price of $3.50 per gallon, that comes to approximately $124.95 in fuel. At a more fuel-efficient 35 MPG, the same trip only needs 28.6 gallons, costing about $100.10. Plan for 2 to 3 fuel stops, depending on your tank size, using the fuel stops formula above to find your exact number.

Calculate your total trip fuel cost first using distance, MPG, and gas price. Then divide that total by the number of people sharing the trip, including the driver, if everyone is contributing. A $150 total fuel cost split four ways comes to $37.50 per person. This calculator does this division automatically once you enter your passenger count.

Divide your tank capacity by your MPG to find your driving range. A 16-gallon tank at 28 MPG gives roughly 448 miles of range per tank. On an 800-mile trip, that means at least 1 to 2 fuel stops, though most drivers stop more often rather than running the tank near empty. Plan stops every 300 to 350 miles for a safety buffer.

Yes, for most vehicles. Steady highway driving at 55 to 65 mph typically delivers 15 to 30 percent better fuel economy than stop-and-go city driving. Above 70 mph, aerodynamic drag increases quickly and starts to reduce that highway advantage. A vehicle rated at 28 MPG combined might see 32 to 34 MPG on a steady highway road trip.

Calculate your expected gallons needed using distance divided by MPG, then multiply by your expected gas price plus a 10 percent buffer for price variation along the route. A 1,000 mile trip at 28 MPG and an example price of $3.50 per gallon costs about $125. Budgeting $135 to $140 accounts for price swings between states or unexpected detours. Remember that fuel typically represents only 25 to 40 percent of your total road trip budget.

Fill up in towns rather than at highway exit stations, since exit stations often charge $0.20 to $0.40 more per gallon. Use a gas price app to compare nearby stations before each stop. Maintain steady highway speeds around 60 to 65 mph rather than higher speeds, since this alone can improve fuel economy by 15 to 20 percent over a long trip.

This calculator uses the same fuel economy formulas used industry-wide, based on the distance, MPG, and gas price you enter. Accuracy depends on how close your entered MPG is to your vehicle’s real-world performance. Manufacturer MPG ratings can run 10 to 20 percent higher than real-world results, so using your own calculated MPG from a recent fill-up gives a more accurate trip estimate than the sticker figure.

Yes. Diesel vehicles work the same way in this calculator. Enter your diesel vehicle’s MPG or L/100km figure and your local diesel price per gallon or litre. The formula does not change based on fuel type, since it is based purely on your vehicle’s efficiency and the price you pay at the pump.

This calculator is built around gallons and litres of liquid fuel, so it is designed for petrol and diesel vehicles. For an electric vehicle cost comparison, use the EV vs Petrol calculator, which compares electricity cost per kWh against your current petrol or diesel running cost for the same trip distance.

Several factors can shift your actual fuel use away from the estimate. Headwinds, hilly terrain, cold weather, heavy traffic, vehicle load, and driving style all affect real-world MPG. The calculator gives you a solid planning estimate based on the MPG you enter, but treat it as a budget guide rather than an exact prediction, and build in a small buffer for longer trips.

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Disclaimer

This calculator provides estimates only. Actual trip fuel costs vary depending on driving conditions, local fuel prices, vehicle load, and route. See our full disclaimer page for more details.