ToolDropRoommate Rent Splitter — Split Rent Fairly by Room Size and Bathroom
Enter the rent and each room, pick a method, and see exactly what everyone owes. Then send one link so your roommates can check the numbers.
How the rent splitter works
Dividing rent evenly is easy, but it is not always fair. A large room with its own bathroom is worth more than a small room that shares one. This tool gives you three transparent ways to split:
- Equal split. Total rent ÷ number of people. Best when rooms are similar.
- By square footage. Each share = rent × (your room's sq ft ÷ total sq ft of all the rooms).
- By square footage + private bath. Same as above, but a room with its own bathroom counts as 10–20% bigger (you choose the percentage). It is a simple way to price in a private bathroom without arguing about every detail.
Common areas such as the kitchen and living room are not counted, because everyone uses them. Only private rooms are compared. If you want to reflect something else, like a balcony, parking spot or a room with no window, use the adjustment box for that person.
Worked example
Total rent $3,000. Alex has a 200 sq ft room with a private bath, Sam has 150 sq ft, and Jordan has 120 sq ft. The bath premium is 15%.
| Person | Room | Equal | By sq ft | Sq ft + bath |
|---|---|---|---|---|
| Alex | 200 sq ft + bath | $1,000.00 | $1,276.59 | $1,380.00 |
| Sam | 150 sq ft | $1,000.00 | $957.45 | $900.00 |
| Jordan | 120 sq ft | $1,000.00 | $765.96 | $720.00 |
| Total | $3,000.00 | $3,000.00 | $3,000.00 |
With the bath premium, Alex's room counts as 200 × 1.15 = 230 weighted sq ft, so the weights are 230 : 150 : 120 and Alex pays 230 ÷ 500 = 46% of the rent. These numbers are produced by the same calculator code that runs above.
Tips for a fair conversation
- Pick the method before anyone commits to a room, so nobody feels the formula was chosen after the fact.
- Share the link so everyone can change the numbers themselves and see the effect.
- Re-run it when someone moves out or a new person moves in.
Frequently asked questions
How should roommates split rent when the rooms are different sizes?
A common fair approach is to split by square footage, so the person with the bigger room pays a bigger share. Many households also adjust for features that clearly matter, such as a private bathroom. Whatever you choose, agree on it before anyone signs or moves in, and write it down.
Should a private bathroom cost extra?
Most people think it should. This tool lets you treat a private bathroom as a percentage premium on that room (10–20% is a typical starting point). There is no official rule. It is a number the household agrees on, and you can set it to 0 to ignore bathrooms.
What if one room has something else that matters, like a balcony, a walk-in closet or no window?
Use the optional adjustment box. Enter a positive amount for a room that should pay more and a negative amount for one that should pay less. The other people automatically cover the difference so the total still matches the rent exactly.
How does the calculator handle cents so the shares add up?
Every amount is converted to whole cents and shared out using the largest-remainder method: each person gets their rounded-down share, and the few leftover cents go to the people with the biggest fractional remainders. The shares therefore always add up to exactly the rent, with no penny missing or extra.
Can I split shared utilities at the same time?
Yes. Turn on shared utilities, enter the monthly total, and choose whether to split it equally or with the same weights as rent. Each person then sees one combined monthly number.
Is my information saved or sent anywhere?
No. The calculation runs in your browser. Your numbers are stored only in the link you copy (in the part after the # sign, which your browser does not send to the web server). Anyone you give the link to can see those numbers, so only share it with people you trust.
Is this legal or financial advice?
No. It is a calculator. Leases and local rules, for example what a master tenant may charge subtenants in your city, can limit how rent may be divided, so check your lease and local rules.
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