Rent split calculator
Split the rent by room size, with the shared spaces split equally and a little extra for a private bathroom. Add as many rooms as you have.
How it works
- The shared part of the rent (30% by default) is split equally between everyone.
- Each room is weighed by its size. A private bathroom adds 10% to its room by default, so a 30 m² room with a bathroom counts as 33.
- The rest of the rent is split in proportion to those weights, and each person’s two parts are added together.
- Shares are rounded to the cent so they add up to the rent exactly; any leftover cent goes to whoever was closest to rounding up.
Example
Maya, Jonas and Amara share a flat for 2,400 a month. With 30% for shared space, 720 is split equally: 240 each. Maya’s 30 m² room has its own bathroom, so it counts as 33, against Jonas’s 24 and Amara’s 20. The remaining 1,680 splits 33 : 24 : 20, so Maya pays 960.00, Jonas 763.64 and Amara 676.36. The guide to splitting rent fairly compares this with an equal split and a split by income.
Common questions
How does the rent split calculator work?
Part of the rent, for the kitchen, living room and other shared spaces, is split equally. The rest is split in proportion to each bedroom’s size, with a private bathroom counting extra. The shares are rounded so they add up to the rent exactly.
What percentage of rent should go to shared space?
Around 30% is a common starting point. Raise it if the shared spaces are large or the bedrooms are much the same, and lower it if the bedrooms are where most of the space is.
Does it matter whether I measure in square metres or square feet?
No. Use whichever you like, as long as every room is measured the same way. Only the sizes relative to each other matter.
What other ways are there to split rent?
Equally, by income, or by a points system that weighs things like light, noise and storage. The guide to splitting rent fairly compares them on one flat.