Splitting rent when the bedrooms are unequal
A square-footage formula that survives the group chat.
In this guide
Divide each bedroom’s private area by the total private area in the home, then apply that percentage to rent. Shared space stays out of the calculation. Adjust by 5–10% for amenities a room does or does not have — an en-suite, a balcony, no closet, no window — and rebalance the difference across the other rooms.
- Only private space counts. Kitchens, hallways and shared bathrooms are used by everyone.
- Percentages must sum to 100% and the dollar amounts must sum to exactly the rent.
- Amenity adjustments should be named out loud, not folded silently into the numbers.
- Re-run the numbers only when something material changes — a room swap, a new tenant, a rent increase.
The formula
Each person’s rent = (their private square footage ÷ total private square footage) × monthly rent. That is the whole method. Its value is not mathematical sophistication — it is that the input is a measurement rather than an opinion.
- Measure every bedroom. Length × width. Include an attached bathroom, walk-in closet or balcony that only one person can use.
- Total the private areas. This becomes the denominator for everyone’s share.
- Convert each room to a percentage. Room area ÷ total private area. Check the percentages sum to 100%.
- Apply the percentages to rent. Round to the cent and confirm the amounts add back to the rent exactly.
- Adjust for amenities last. Move 5–10% off a room with no closet or no natural light, and onto rooms with an en-suite or private outdoor space.
When square footage is the wrong answer
Square footage measures floor area, not desirability. A 160 sq ft room facing a brick wall on a main road is not worth more than a 140 sq ft corner room with two windows, whatever the tape measure says. Where the rooms differ in kind rather than in size, price them the way a landlord would: what would each one let for on its own?
- A room used as a bedroom and a home office all day carries more value than its area suggests.
- A through-room that other people walk across carries less.
- A basement or attic room with restricted headroom should be discounted regardless of footprint.
Frequently asked questions
How much less should a small bedroom pay?
Do closets and en-suites count in the measurement?
What if the rooms are the same size but one is much nicer?
Priya R.
Editorial lead for Expenso’s shared-housing guides
Priya leads Expenso’s editorial work on rent splitting, shared bills and household agreements. Her guides turn common shared-money decisions into methods readers can check and reproduce.
