Road Trip Fuel Calculator
Fuel and charging for a multi-leg route, leg by leg, with the total and the cost per traveller.
A long route is not one journey. Motorway, mountain roads and city traffic consume very differently, and a single average hides that. Splitting the trip into legs is what makes the estimate usable.
Enter each leg with its own consumption, then the price of fuel and how many people share the cost, and this calculator gives the fuel for each leg, the total and the cost per traveller.
At a glance
- What you enter
- Leg 1 distance, Leg 1 consumption, Leg 2 distance, Leg 2 consumption, Leg 3 distance, Leg 3 consumption, Price per gallon, People sharing the cost, How much cheaper fuel is elsewhere
- What you get
- Total fuel cost, Total fuel, Cost per traveller, Overall consumption, Saving from buying at the cheaper price
- Formula shown
- Yes - every step, right below your results.
- Cost and privacy
- Free, no account needed, and nothing you type is stored.
See worked examples ↓ Read the FAQ ↓ Share this calculator ↓
Results are estimates for general information only - always verify with a professional or official source before acting on them.
How to use the Road Trip Fuel Calculator
- 1 Enter Leg 1 distance (miles)
- 2 Enter Leg 1 consumption (miles per gallon)
- 3 Enter Leg 2 distance (miles)
- 4 Enter Leg 2 consumption (miles per gallon) - Mountain roads and traffic are worse than motorway cruising.
- 5 Enter Leg 3 distance (miles)
- 6 Enter Leg 3 consumption (miles per gallon)
- 7 Enter Price per gallon
- 8 Enter People sharing the cost (people)
- 9 Enter How much cheaper fuel is elsewhere - The difference per gallon between the most and least expensive place on the route.
- 10 Press Calculate. You get Total fuel cost, Total fuel, Cost per traveller, Overall consumption, Saving from buying at the cheaper price, and every intermediate step stays visible under “How is this calculated?”
- 11 Change one number at a time to see what moves the result - that is usually the most useful thing a calculator can tell you.
Worked examples
Real numbers run through this calculator. Open any example to load it into the form above and change it.
A 580 mile trip in three legs
Motorway, then mountain roads, then city traffic, with the fuel shared between two people.
You enter
- Leg 1 distance
- 250 miles
- Leg 1 consumption
- 34 miles per gallon
- Leg 2 distance
- 180 miles
- Leg 2 consumption
- 26 miles per gallon
- Leg 3 distance
- 150 miles
- Leg 3 consumption
- 22 miles per gallon
- Price per gallon
- $3.60
- People sharing the cost
- 2 people
- How much cheaper fuel is elsewhere
- $0.20
You get
- Total fuel cost
- $75.94
- Total fuel
- 21.09 gallons
- Cost per traveller
- $37.97
- Overall consumption
- 27.50 miles per gallon
- Saving from buying at the cheaper price
- $4.22
The route uses 21.09 gallons over 580 miles, which is 27.50 miles per gallon overall against 34, 26 and 22 on the three legs. At $3.60 a gallon the fuel costs $75.94, or $37.97 each for two people and $0.13 a mile. The first leg uses the most fuel at 7.35 gallons because it is the longest, and buying every gallon 20 cents cheaper would save $4.22 across the trip. Fuel is all that is counted: tolls, parking and food are not in the total.
A 720 mile trip with a thirsty mountain section
A long motorway run, a short mountain road and a final motorway leg, shared between three people.
You enter
- Leg 1 distance
- 420 miles
- Leg 1 consumption
- 38 miles per gallon
- Leg 2 distance
- 90 miles
- Leg 2 consumption
- 18 miles per gallon
- Leg 3 distance
- 210 miles
- Leg 3 consumption
- 30 miles per gallon
- Price per gallon
- $4.20
- People sharing the cost
- 3 people
- How much cheaper fuel is elsewhere
- $0.35
You get
- Total fuel cost
- $96.82
- Total fuel
- 23.05 gallons
- Cost per traveller
- $32.27
- Overall consumption
- 31.23 miles per gallon
- Saving from buying at the cheaper price
- $8.07
The trip uses 23.05 gallons over 720 miles, an overall 31.23 miles per gallon. At $4.20 a gallon the fuel is $96.82, which is $32.27 each for three people and $0.13 a mile. The 90 mile mountain leg at 18 miles per gallon uses 5.00 gallons, while the 210 mile motorway leg that follows it at 30 miles per gallon uses 7.00, so the short section costs more per mile than three times its length suggests. A 35 cent price gap across the whole trip is worth $8.07.
Guides that go with it
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Frequently asked questions
Why does each leg have its own consumption figure?
Because consumption changes with the road and the load. Motorway cruising, mountain roads with a loaded car and city traffic at the end of a trip can differ by a third, and one average hides where the fuel actually goes. Each leg is its own distance divided by its own miles per gallon, and the gallons are then added up.
If you do not have figures for this car yet, use what the trip computer showed on a similar road type rather than the published combined figure, which is measured under test conditions with a warm engine and no roof box.
How is the overall consumption different from the leg figures?
The overall figure is the total distance divided by the total fuel, which is the average the car actually achieved on this route. It sits between the leg figures and is weighted towards the longest leg rather than the worst one. In the first example 580 miles on 21.09 gallons is 27.50 miles per gallon, between the 22 of the last leg and the 34 of the first.
That weighting is why a short thirsty section does not ruin the average, and why a long motorway leg has more influence than anything else on the trip.
Are tolls, ferries and overnight stops included?
No. This page covers fuel only, plus the effect of the price difference between places on the route. Tolls, a ferry crossing, parking and accommodation are separate, and on some routes they cost more than the fuel itself. The Road Trip Cost Calculator is the page that adds them into a total.
What the price gap line does cover is buying every gallon at the cheaper end of the range: the whole trip fuel multiplied by the difference you enter. On a long trip that is often a few dollars rather than a large saving, and the detour to reach the cheaper station can cost more than it saves.
What is the refuelling stops figure for?
It divides the total fuel by a 12 gallon tank and rounds up, giving a rough count of how many times you will stop. It is a planning figure rather than a precise one, because the tank size is fixed at 12 gallons and most drivers refuel well before the tank is empty.
Use it to spot a leg that is longer than a comfortable range, especially where stations are sparse. The number of stops affects the length of the day more than it affects the cost of the fuel.