When guests stay different numbers of nights, choose whether to divide the whole booking by total person-nights or divide each night’s price between the people staying that night. Both approaches can be reasonable, but they do not always give the same answer.
Agree the rule before booking. The arithmetic can follow a decision; it cannot decide what your friends consider fair.
Method one: pool the person-nights
Add up each person’s nights. Divide the shared accommodation cost by that total, then multiply by each person’s nights.
Individual share = total cost × individual nights ÷ total person-nights.
Imagine a four-night booking costing USD 1,200, with each night priced at USD 300. Alex and Bea stay four nights each; Chris stays two. There are ten person-nights, so the pooled rate is USD 120 per person-night.
| Guest | Nights | Pooled share |
|---|---|---|
| Alex | 4 | USD 480 |
| Bea | 4 | USD 480 |
| Chris | 2 | USD 240 |
| Total | 10 | USD 1,200 |
This method treats each person-night as having the same value across the booking. It can be simple when the group deliberately shares the full reservation as one package.
Method two: split each night by its occupants
For the same example, suppose Chris stays the first two nights. Three people share each of those nights: USD 100 per person per night. Alex and Bea share the last two: USD 150 each per night.
| Guest | First two nights | Last two nights | Total |
|---|---|---|---|
| Alex | USD 200 | USD 300 | USD 500 |
| Bea | USD 200 | USD 300 | USD 500 |
| Chris | USD 200 | USD 0 | USD 200 |
| Total | USD 600 | USD 600 | USD 1,200 |
Chris pays less under this rule. Alex and Bea carry the cost of the lower-occupancy nights. If nightly booking prices vary, use the actual price for each night rather than assuming a constant rate.
Choose the method that matches the agreement
| Situation | Rule to discuss |
|---|---|
| Whole booking shared as one package | Pooled person-nights |
| Each date should pay for itself | Nightly occupancy |
| Rooms differ significantly | Agreed room allocation, then nights within each room |
| Guest cancels after booking | Previously agreed cancellation arrangement |
Neither formula automatically accounts for a private bathroom, a sofa bed, or someone joining after the price was committed. Discuss those differences rather than labeling one formula universally fair.
Separate fees and refundable deposits
Decide whether a fixed cleaning fee is per person, per stay, or included in your chosen accommodation rule. Apply the decision consistently. A refundable security deposit needs its own record of who advanced it and whether it was returned; do not assume it is a permanent group cost.
If a deposit is credited against the booking price, record the deposit plus the outstanding amount. Recording those two payments and the full booking price would count the accommodation twice.
Turn agreed shares into final balances
The table above tells you each person’s share, not necessarily their repayment. If more than one person paid the provider, subtract each person’s share from what they already paid. Follow the trip expense example to calculate the resulting balances.
You can record agreed custom amounts in Splitra. Calculate the nights-based shares first; do not assume the app will infer your allocation rule from arrival dates. Save the agreement with the trip preparation notes so everyone can check it later.