Free tool
Split an Airbnb by number of nights
Everyone stays a different number of nights: tick who sleeps where, choose between the person-night method and the night-by-night method, and compare both results down to the cent.
Cost of the stay
From 1 to 14 nights. The accommodation cost is assumed to be the same for every night.
How to split the accommodation
Neither one is “the” fair method: they are two conventions. Agree on one before you book, especially if people do not all arrive together.
How to split the fixed fees
Cleaning is billed once for the whole stay: some groups split it evenly, others in proportion to time on site. Choose, rather than inherit an implicit rule.
Who sleeps there, and which nights
Tick the nights each person actually spends on site.
Accommodation
€0
Fixed fees
€0
Each person's share
Enter the amounts to see the result.
Everything is computed in your browser: nothing is stored or sent.
Whole-cent arithmetic with a largest-remainder distribution of the leftovers: the shares are checked against the total by automated tests.
For tracking several expenses over time, with your friends.
Two legitimate methods, not one right answer
Person-nights: add up everyone's nights, divide the accommodation cost by that total, and multiply by each person's nights. It is a rule that is simple to explain, and it is enough when occupancy barely changes.
Night by night: each night is paid only by the people sleeping there that night, then the nights are added up per person. It follows the real occupancy of the property, night after night.
A worked example checked by our tests: 600 for five nights, three people staying every night and a fourth joining for the last two. Person-nights gives 176.47, 176.47, 176.47 and 70.59. Night by night gives 180, 180, 180 and 60, because the first three nights were shared by three people only. Both add up to exactly 600.
Cleaning and other fixed fees
Cleaning, service and booking fees are charged once for the whole stay, so the tool keeps them apart from the nightly cost and lets you choose: evenly among all travellers, or in proportion to nights.
Splitting them evenly reflects the fact that the fee does not depend on how long you stayed. Splitting them in proportion to nights keeps a single rule for the whole invoice. Both are defensible — decide out loud rather than inherit an implicit rule.
Unequal rooms, couples, children
A night-based split deliberately ignores room comfort. When the gap is large — a suite against a sofa bed — a group can choose to settle the difference with a separate agreed amount rather than distort the night count.
For children sharing their parents' room, a group may choose not to count an extra night, unless the size of the property was chosen because of them. The tool assumes the accommodation cost is the same for every night.
What the tool does not decide
This is a maths calculator, not a rule about who owes what: your booking, your agreement with the host and what the group promised each other come first.
Once the shares are known, the practical part is tracking who actually paid what. In a Pivunio group everyone adds their own expenses and balances update as you go.
Frequently asked questions
Which of the two methods should we use?
Whichever the group agrees on before booking. Person-nights is simpler to explain; night by night reflects how full the place was on each night. Neither is more legitimate than the other.
When do the two methods give the same result?
Whenever everyone is present on exactly the same nights. They only diverge when occupancy changes, because a night shared by two people costs more per head than a night shared by six.
Nights or days?
Nights. A rental is billed per night, so counting days present would distort the split for people arriving in the morning and leaving in the evening.
How do I handle a deposit already paid?
This tool computes what each person owes on the total cost. Compare that with what each person already paid to get the real balance — which is exactly what a Pivunio group does automatically.
Editorial review — Written and reviewed by the Pivunio team. The methods described here are the ones the app itself uses, and they are covered by automated tests.