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Road trip fuel cost calculator: split petrol per person
Fuel cost per person is the distance divided by the car's mileage, times the fuel price, plus tolls, divided by the people in the car. This calculator does that leg by leg, so friends who join late or leave early pay only for the kilometres they rode, and you choose whether the driver pays a share.
Updated November 2026
Fuel cost splitter
Put the car owner first. The calculator assumes they paid for the fuel and tolls, and everyone else pays them back.
Legs of the trip
One leg is enough if everyone rode the whole way. Add a leg each time someone gets in or out.
How the fuel split works
- Fuel used. Distance ÷ mileage gives litres. With L/100 km it is distance × L/100 km ÷ 100. With mpg it is miles ÷ mpg, in US or UK gallons.
- Cost of each leg. Litres × fuel price, plus the tolls and parking on that leg, plus the optional wear allowance × distance.
- Who shares it. Each leg's cost is divided equally among the people ticked for that leg. If the driver does not pay, it is divided among the passengers only.
- Who pays whom. Each person's shares are added up. The car owner paid at the pump, so everyone else sends their total to the owner.
Amounts are rounded to the paisa or cent, and any leftover goes to the first people in the list so the shares always add up to the trip total. Your trip is saved in this browser only; nothing is uploaded.
Worked example: a weekend drive with one early leaver
Asha drives her car with Ben, Chitra and Dev to a hill town 250 km away. They do 60 km of sightseeing together. Dev stays on for a few days and takes a bus home, so only three people ride the 250 km back. The car does 15 km per litre and petrol costs ₹102 a litre in this example, so fuel works out to ₹6.80 per km. Asha pays for all the fuel, tolls and parking.
| Leg | Distance | Fuel | Tolls and parking | In the car | Each pays |
|---|---|---|---|---|---|
| Drive there | 250 km | ₹1,700 | ₹450 | All 4 | ₹537.50 |
| Sightseeing | 60 km | ₹408 | ₹100 | All 4 | ₹127 |
| Drive back | 250 km | ₹1,700 | ₹400 | Asha, Ben, Chitra | ₹700 |
| Total | 560 km | ₹3,808 | ₹950 | ₹4,758 |
- Asha, Ben and Chitra each owe ₹537.50 + ₹127 + ₹700 = ₹1,364.50.
- Dev owes ₹537.50 + ₹127 = ₹664.50.
- Ben and Chitra send Asha ₹1,364.50 each and Dev sends ₹664.50. That is ₹3,393.50 back to Asha, and her own share of ₹1,364.50 makes up the ₹4,758 she paid.
A flat split of ₹4,758 ÷ 4 would charge everyone ₹1,189.50, and Dev would pay ₹525 for a drive he was not on. That gap is why splitting by leg matters.
If the driver rides free: the same trip costs Ben and Chitra about ₹1,936 each and Dev about ₹886. If the group adds ₹2 per km for wear: 560 km adds ₹1,120 for Asha, and Ben's share rises to about ₹1,686. Press Load example above and flip the switches to see each version.
Should the driver pay for fuel?
This is the question that causes the most arguments, and there is no single right answer. What matters is that the group agrees before the car leaves. These are the usual options:
| Option | How it works | Suits |
|---|---|---|
| Everyone pays equally | Driver is one of the people sharing each leg | Friends going on the same trip, short distances, a car that would be used anyway |
| Driver rides free | Fuel and tolls split among passengers only | Long drives where one person does all the driving, or a friend doing you a favour |
| Everyone pays, plus wear | Equal split, plus an agreed amount per km paid to the owner | Long trips that put real kilometres on someone's car, rough roads |
A wear allowance is a number the group picks, not an official rate. It is meant to cover a share of tyres, servicing and depreciation that fuel alone leaves out. Keep it small and simple, a round figure per km, and say it out loud at the start.
Getting the real number, not just an estimate
The calculator estimates fuel from mileage, which is good for planning and for agreeing a budget. Real mileage moves with traffic, ghats and hills, a full boot and the AC, so the actual bill can differ. To split what you really spent:
- Full tank to full tank. Fill up to the brim before you leave and again when you get back. The fuel you bought on the way plus the final top-up is what the trip used.
- Note the odometer when someone gets in or out. That gives you the distance for each leg without guessing.
- Keep every fuel receipt, or the UPI or card message. Add them up and work out the real mileage (km driven ÷ litres bought), then enter that here.
- Count tolls per leg. FASTag or card statements list each plaza, so you can see which tolls fell on which leg.
Using a car with miles and mpg? Choose the US or UK gallon in Units. As an example, 300 miles at 30 mpg (US) is 10 gallons, and at $3.50 a gallon two people pay $17.50 each. For a CNG car, use km per kg and the price per kg. For an electric car, use km per kWh and the price per kWh.
When fuel is only part of the trip
Fuel is usually one line in a longer list: the stay, food, entry tickets, and fill-ups paid by different people. Once you have each person's fuel share, add it to SplitSimple as one expense split by exact amounts, alongside everything else. The group sees one running balance, "Settle up" suggests the fewest payments, and in a rupee group each person gets a UPI link with the amount filled in. SplitSimple never holds or moves the money. If several people paid for fuel at different stops, the trip expense calculator works out who owes whom across all of it.
Frequently asked questions
How do you calculate fuel cost per person for a road trip?
Divide the distance by the car's mileage to get the litres used, multiply by the fuel price, add tolls and parking, then divide by the number of people in the car. For example, 520 km at 15 km per litre and ₹102 a litre is about 34.7 litres or ₹3,536, which is ₹884 each for four people.
Should the driver pay for fuel?
There is no single rule. Many groups split fuel equally including the driver, because everyone is going on the same trip. Others let the driver ride free, or add a per-km amount for wear on the car, because the driver gives their time and their car. Agree before you leave. The calculator has a switch for each option.
What if someone only travels part of the way?
Split the trip into legs and tick who was in the car for each one. Each leg's fuel and tolls are divided only among the people on that leg, so a friend who takes a bus home does not pay for the drive back.
Can I use it for a CNG or electric car?
Yes. Choose km and km per litre, then enter km per kg and the price per kg for CNG, or km per kWh and the price per kWh for an electric car. The maths is the same, only the unit changes.
Is the estimate the same as what we actually spent on fuel?
Not exactly. Real mileage changes with traffic, hills, load and air conditioning. For the exact figure, fill the tank to full at the start and again at the end, add up the litres or the receipts, and split that total using the same legs.
Track the whole trip with your group
SplitSimple is free: add fuel, stays and food as you go, see who owes whom, and settle up with the fewest payments.
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