Sharing a fuel bill
First calculate trip fuel: distance divided by 100, multiplied by litres per 100 km and fuel price. Then divide that total by the number of people. The split assumes every traveller shares the fuel equally and that the entered distance covers the whole itinerary.
A three-person journey
For 600 km at 7.5 L/100 km, the car uses 45 litres. At 1.70 per litre, fuel costs 76.50; divided among three people, each share is 25.50. The driver pays the same fuel amount at the pump, while the division only records how the group settles it.
Agree on the route before settling
A detour to collect one passenger, a return leg with fewer people, or a separate airport run changes who benefited from which kilometres. Keeping legs separate is fairer than applying one equal split to a journey that was not actually shared equally.
Fuel is not the full travel bill
Parking, toll roads, road permits, charging stops, meals, lodging, and wear on the vehicle are outside the formula. A group may choose to share some of those too, but each needs its own agreed rule rather than an invented fuel consumption figure.
Choose a realistic consumption case
Motorway speed, steep grades, a roof box, and a loaded cabin can make the trip rate higher than the vehicle's mixed average. For the default distance, raising consumption from 7.5 to 8.5 L/100 km adds six litres, or 10.20 at the stated price before any split.
Where equal sharing stops fitting
This page is not a mileage reimbursement calculation. An employer rate can include depreciation and insurance, while a private ride may use a different arrangement. Use the actual agreement when payment is for business travel or a regulated expense claim.
Round only after the group total
Calculate the total fuel amount first and divide once. Rounding each litre, each leg, or each person's partial share can leave a few cents unassigned. For the displayed case, 76.50 divides exactly; other totals may need a named rule for who covers the remainder.
Build a leg-by-leg settlement when passengers change
A single equal split works only when the same people share the same fuel-consuming distance. Imagine 180 km with Alex and Bea, then 420 km with Alex, Bea, and Chen. At 7.5 L/100 km and 1.70 per litre, the first leg costs 22.95 and the second costs 53.55. Splitting the first in two gives 11.48 each; splitting the second in three gives 17.85 each. Alex and Bea therefore owe 29.33 each, while Chen owes 17.85. Dividing the full 76.50 by three would charge Chen for kilometres taken before joining.
Settle in the currency actually paid
The fuel calculation may use a pump receipt, while travellers repay by bank transfer, cash, or a payment app. Keep the receipt currency and round the final owed amounts, not every intermediate multiplication. If 76.50 is split among four, 19.125 cannot be paid in ordinary cents: three people might pay 19.13 and one 19.11, or the driver can carry the two-cent difference. Naming that rule before requesting payment avoids presenting a rounding decision as another fuel expense.
A reimbursement rate is a different model
An organisation may pay a fixed rate per mile or kilometre, irrespective of the particular pump receipt. Such a rate can be intended to recognise fuel, tyres, servicing, insurance, and depreciation together. It must not be reverse-engineered by feeding it into a litres-per-100-km form. Keep a fuel split for private shared travel and use the employer's written rate, eligible distance, route evidence, and policy dates for a business claim.
Handle a return journey as another record
An outbound route can have three passengers, a loaded boot, and a higher fuel price than the empty return with two people. Run each direction separately if those facts change. The two results can then be combined only for the people who shared both legs, while an individual passenger receives a transparent charge for the leg actually taken. This approach is more useful than arguing over whether a driver would have travelled anyway, because it documents the chosen settlement rule and the inputs that produced each amount.
Agree on the rule before the journey
A fair settlement is not always an equal one, but it should be stated before the receipt arrives. Decide whether the driver is included in the split, whether detours are shared, whether tolls belong in the fuel request, and how a passenger joining midway is treated. Put fuel, tolls, parking, and accommodation on separate lines so that someone can accept one item without disputing the calculated litres. At the end, reconcile the pump receipt with the amount collected. A transparent itinerary and a named rounding rule reduce friction better than adding invented precision to a per-person amount.
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It is informational only and is not medical or professional advice.