Rent Split Calculator
Work out a fair share of the rent for every room: by room size with a shared-space share, by income, or equally. Couples, private bathrooms and shared bills included.
| Room | Rent | Bills | Pays |
|---|---|---|---|
| Total |
Three fair ways to split rent
There's no single right answer, so the calculator gives you the three methods housemates use most and lets your group pick:
- By room size. Part of the rent covers the space everyone shares (kitchen, living room, hallways), and that part is split equally per person. The rest is split by bedroom size, so a bigger room costs more.
- By income. Each room or person pays in proportion to what they earn. Couples often use this when one partner earns more.
- Equally. Everyone pays the same per person. Simple, and fair when the rooms are about the same.
How the room-size split works
Take a $2,400 apartment with three bedrooms of 180, 150 and 120 sq ft, where a couple shares the smallest room, and a 50% shared-space share:
- Shared space: 50% of $2,400 is $1,200, split between 4 people: $300 each.
- Bedrooms: the other $1,200 is split by size (180 + 150 + 120 = 450 sq ft): 180/450 is $480, 150/450 is $400 and 120/450 is $320.
- Add them up for each room: one share of the shared space per person, plus the room's own part.
| Room | People | By room size | Equally |
|---|---|---|---|
| 180 sq ft | 1 | $780 | $600 |
| 150 sq ft | 1 | $700 | $600 |
| 120 sq ft (couple) | 2 | $920 ($460 each) | $1,200 |
With an equal split per person, the couple would pay $1,200 for the smallest room. By room size they pay $920: more than either single person, because two people use the shared space, but less per person, because they share a small bedroom.
The shared-space share changes the answer a lot. At 0%, rent follows bedroom size only; at 100%, everyone pays the same per person. Try a few values together and settle on one before anyone signs.
Couples, private bathrooms and bills
A couple in one room
Set People to 2 for their room. They pay two shares of the shared space but split one bedroom between them. If your group prefers to treat a couple as one tenant, set People to 1 instead.
A private bathroom, balcony or parking spot
Add the bathroom's size to the room, or use Adjust %: +15 makes the room count as 15% bigger, and a minus number makes it count as smaller, for example for a room with no window. The calculator doesn't pick a number for you; agree on it as a group.
Electricity, internet and other bills
Enter the monthly total under Shared bills. By default each person pays the same share, since everyone uses the internet and the heating; choose split like the rent if your group prefers that.
Once you agree, write the amounts down where everyone can see them, such as in your group chat, and run the numbers again when someone moves in or out. Copy summary gives you a ready-to-paste list.