Free road trip fuel cost calculator: plan multi-stop trips with tolls and parking, then split the total fairly per person, one way or round trip.
Your results will appear here.
Enter your values and press Calculate.
Enter your total trip distance and choose metric or imperial units, then add your vehicle's fuel economy and the fuel price per litre or gallon. Flip the round-trip switch to double the distance, and add tolls, parking and other fees. Enter the number of travelers and choose whether everyone pays equally or the driver is exempt. The calculator shows fuel needed, fuel cost, extras, the full trip total, the per-person share and the cost per kilometre or mile, updating instantly as you type.
The core formula is always the same: (Distance / Fuel Economy) × Fuel Price = Fuel Cost. In metric units, fuel needed in litres = distance in km × economy (L/100km) / 100. In imperial units, gallons = distance in miles / MPG. For example, a 500 km trip at 8 L/100km needs 40 litres; at $2.50 a litre that is $100 of fuel. A round trip simply doubles the distance. Our calculator then adds tolls, parking and fees, and divides the full total by travelers for the per-person share.
Pick metric or imperial units first, because fuel economy means different things in each system. Enter the total distance you will actually drive, including any detours or side stops. Flip round trip to yes if you are driving back the same way. Enter your vehicle's real fuel economy, not the brochure figure, plus the fuel price per litre or gallon. Add tolls and parking fees, enter the number of travelers, and choose the split mode. Every result updates live as you type.
A round trip doubles everything fuel-related: 300 miles at 30 MPG is 10 gallons one way and 20 gallons round trip. If your trip has several stops, add the legs together into the total distance field. Many travelers underestimate distance by 10 to 15% because they skip detours, restaurant runs and wrong turns; building in a small margin keeps the budget honest. The cost per km line in the results tells you how distance-sensitive your plan really is.
Fuel is rarely the whole bill. Tolls on a long interstate or motorway run can add $10 to $50 or more, and parking in cities adds up fast. Most simple fuel calculators ignore these, which is why trips always cost more than expected. Enter the toll total and parking fees in their own fields so they land in the per-person split too. Fuel-only splits are the number-one source of road trip money arguments, so itemize everything.
The fairest split is the full trip total divided equally among travelers, because everyone benefits from the car, the tolls and the parking. The 'passengers only' mode divides by travelers minus one, leaving the driver exempt; use it when the driver already contributes the car and its wear and tear. If you take two cars, calculate each car separately and each car's travelers split their own car's total. Be explicit before the trip: deciding the split rule at the destination is how friendships get tested.
Official economy figures are measured in ideal conditions. A loaded car with luggage, air conditioning on, and highway speeds above 100 km/h can burn 15 to 25% more than the rated figure. Roof boxes and trailers hurt even more. For an honest estimate, use your own measured economy from a recent long drive, or knock 15% off the official figure. Tires matter too: under-inflated tires add a few percent of fuel cost all by themselves.
Three levers cut the fuel bill most: drive at a steady moderate speed (fuel use climbs sharply above 110 km/h), combine stops so the engine stays warm, and compare fuel prices along the route before you go, since prices can differ 20% between towns. Lighten the load and remove roof boxes you are not using. Splitting the trip across more travelers is the fastest way to cut your personal share: the same $80 trip is $40 each with two people and $20 each with four.
The total includes fuel, tolls, parking and the fees you enter, split per person. It does not include food, lodging, vehicle wear and tear, or rental costs. Those belong in a full trip budget, not a fuel cost calculation. Fuel prices also move: check current prices along your route the week you travel, because a 50-cent swing changes a 2,000-mile trip by real money. Use this tool for the fuel-and-road side of planning, and treat the figure as an estimate, not a quote.
Use the formula: (Distance / Fuel Economy) × Fuel Price. For a 500 km trip at 8 L/100km and $2.50 a litre, that is 40 litres and $100. Our calculator does this automatically, adds tolls and parking, doubles the distance for round trips, and splits the total per person.
Yes, assuming the same route, speed and fuel price both ways. Flip the round-trip switch and the calculator doubles the distance before calculating fuel, tolls and fees. Real-world differences like traffic or different fuel prices at the far end can make the actual total slightly higher or lower.
Use your real measured economy, not the official rating. A loaded car with air conditioning typically burns 15 to 25% more than the brochure figure. If you do not know your real economy, reduce the official rating by about 15% for a safer estimate.
Divide the full trip total (fuel plus tolls plus parking) equally among all travelers. If the driver provides the car and absorbs wear and tear, the passengers-only mode divides by travelers minus one, leaving the driver exempt. Agree on the rule before the trip, not after it.
It depends on who provides the car. If the driver owns and maintains the vehicle, it is common for passengers to cover the fuel, tolls and parking while the driver pays nothing. If everyone is sharing costs evenly including the car, split everything equally.
Yes, when you enter them. The calculator has separate fields for tolls and parking or other fees, and they are included in the trip total and the per-person split. Fuel-only estimates that ignore tolls routinely understate long-distance trips.
Add up all the driving legs into the total distance field, including detours and side trips. The calculator treats it as one total, so a five-stop route is just the sum of its legs. Build in about 10% extra distance for wrong turns and unplanned detours.
Slightly. Four adults plus luggage add several hundred pounds, which raises fuel consumption a few percent, mostly in stop-and-go traffic. At highway cruise speeds the effect is small. The far bigger effect of extra passengers is that the per-person cost drops dramatically.
Research your specific route, since tolls vary enormously: some cross-country routes cost almost nothing, others can exceed $50. Enter the toll total in its own field so it is included in the per-person split. When in doubt, check a toll calculator for your route before finalizing the budget.
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