Bigger room, bigger share; the kitchen and living room are everyone's. Enter the rent and your rooms, and get a split that adds up to the cent.
| Room | Size | Room part | Shared part | Pays |
|---|---|---|---|---|
| Big room1 person | 16 m²× 1.15 = 18.4 | $784.57 | $240.00 | $1,024.5742.7% |
| Middle room1 person | 12 m² | $511.67 | $240.00 | $751.6731.3% |
| Small room1 person | 9 m² | $383.76 | $240.00 | $623.7626% |
| Total | 37 m² | $1,680.00 | $720.00 | $2,400.00 |
Shared spaces. 30% of $2,400.00 is $720.00, split equally between 3 people (about $240.00 each).
Rooms. The other $1,680.00 is split by size, after each room's extras are added: the rooms come to 39.4 weighted m², so each weighted m² costs about $42.64. Big room: 16 × 1.15 = 18.4.
Rounding. Every share is rounded to the cent and the leftover cents go to the largest remainders, so the shares add up to exactly $2,400.00.
Rent pays for two things: your own room and the spaces everyone uses. So the calculator splits it in two parts. The shared part (the percentage you choose) is divided equally per person, because everyone uses the kitchen the same amount whether their room is big or small. The room part is divided in proportion to each room's size. Extras raise a room's size in the sum: with a +15% private bathroom, a 16 m² room counts as 18.4 m².
A couple in one room pays the room's part once and the shared part twice, and the tool shows each person's half.
There is no single correct percentage. A shared part between 20% and 40% is a reasonable place to start the conversation; raise it if the rooms are similar and the living areas are big, lower it if the rooms differ a lot. Agree the premiums together before anyone sees the result, and measure every room the same way. You can type sizes as 4 x 3.5, or add the parts of an odd-shaped room: 4x3 + 2x1.
Each share is worked out exactly, cut down to whole cents, and the few cents left over go to the rooms with the largest fractions (the largest-remainder method). The shares always add up to the rent, so nobody has to cover a rounding gap.
Money, chores and the ground rules. Each tool remembers your house in this browser and works offline once loaded.
Two free tools from elsewhere for the admin side of sharing a home.
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Look up a domainIt is a good start, but size is not everything: light, noise, a lock on the door or a shared wall with the bathroom matter too. Use the extras for anything your household agrees is worth more, including negative premiums for drawbacks.
Usually not. Bills like internet or heating are better split equally or by use. Add them with the shared expenses settle-up tool instead.
Only in this browser's local storage, so your rooms are there next time. Nothing is sent to a server.