Shared Rent Split Calculator
Split rent and bills between housemates by room size instead of dividing equally, and see exactly how much each method changes your share.
💼 Are you a real estate agent or broker? Send this calculator to your buyers on your own branded listing page — every enquiry comes straight to your WhatsApp. Create free agent page →Splitting rent equally is only fair when the rooms are equal, and they almost never are. One bedroom has the bay window and the ensuite, another barely fits a desk, and everyone pays the same because dividing by the number of people is the easy thing to do.
Weighting rent by room area is the usual fix. Shared costs — bills, internet, council or municipal charges — stay split equally, because everyone uses the kitchen and the heating regardless of where they sleep.
The method
Rent is allocated by room area: your rent = total rent × (your room ÷ all bedrooms). Shared bills are divided equally by the number of people, since communal use has nothing to do with bedroom size.
Worked example
Rent of 2,400 and bills of 300 across three housemates. Your room is 180 of 450 square units of bedroom space, so you take 40% of the rent — 960 — plus 100 of bills, giving 1,060. An equal split would be 900, so the largest room pays 160 more, and the two smaller rooms pay less.
When area alone is not enough
An ensuite, a balcony, or a room on a quiet side of the building are worth real money that square footage does not capture. A common approach is to weight by area first, then agree a flat premium of a few percent for those features, so the adjustment is explicit rather than argued about later.
Turn a calculation into an enquiry
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Create your free property pageFrequently asked questions
Should bills be split by room size too?
Generally no. Heating, internet and communal electricity are consumed in shared spaces and by shared habits, not in proportion to bedroom area. Splitting bills equally and rent by size is the arrangement most housemates find fair.
What about a couple sharing one room?
Two people in one room use more of the shared space and bills than one, so a common approach is to count them as two people for bills while charging their room once for rent. Agree it before anyone moves in.
How do we measure the rooms?
Length times width from the floor plan is close enough — the split depends on the ratio between rooms, not on absolute accuracy. Exclude built-in wardrobes consistently, or include them consistently, in every room.