How the fair split works
weight = nights stayed × room share
your share = total × your weight ÷ everyone's weights added up
your share = total × your weight ÷ everyone's weights added up
Shares are worked out in cents and rounded with the largest-remainder method, so they always add up to exactly the total — nobody ends up a cent short.
Worked examples
By nights: a $600 rental where two people stay 4 nights and one stays 2 adds up to 4 + 4 + 2 = 10 person-nights at $60 each: $240, $240 and $120.
With a better room: a $100 stay for three people, 3 nights each, where one has a room share of 1.5. Weights are 4.5, 3 and 3 (total 10.5), so the shares are $42.86, $28.57 and $28.57.
Cleaning fees, couples and more are covered in our guide: how to split Airbnb costs.
Agreeing on room shares
- Agree on the rule before you book — it's easier than negotiating afterwards.
- A simple scale works: 1 for a standard bed, 1.25–1.5 for a private room or en-suite, 0.75 for a sofa bed or shared room.
- Couples sharing a room can be entered as two people, or as one entry with double the share.
Splitting food, gas and activities as well? Use the group trip expense splitter.