How to split rent with roommates fairly
Sharing a flat means splitting rent and utilities every month. If the bedrooms are the same size, splitting equally is easiest. But when one room is bigger or has its own bathroom, an equal split quietly favors whoever has the best room. Below are the three most common ways roommates split rent, all worked out on the same example, plus how to handle utilities, odd cents and people moving in or out.
1. The example
Three roommates share a $2,400-a-month apartment. Room A is 200 sq ft; rooms B and C are 150 sq ft each, for 500 sq ft of bedroom space. By size, that's 40% for A and 30% each for B and C. Utilities and internet come to about $180 a month.
2. Three ways to split the rent
An equal split is simple but favors the biggest room. A straight room-size split looks fair, but it also divides the shared kitchen, living room and bathroom by bedroom size. A popular middle ground is to split half the rent equally (for shared space) and half by room size.
| Method | A (200 sq ft) | B (150 sq ft) | C (150 sq ft) | Total |
|---|---|---|---|---|
| Equal split | $800 | $800 | $800 | $2,400 |
| By room size (40/30/30%) | $960 | $720 | $720 | $2,400 |
| Hybrid (50% equal + 50% by size) | $880 | $760 | $760 | $2,400 |
Hybrid math: the shared half is $1,200 ÷ 3 = $400 each. The room half is $1,200 × 40% = $480 for A and $1,200 × 30% = $360 for B and C. So A pays $400 + $480 = $880 and B and C pay $400 + $360 = $760. That works out to about 36.7% for A and 31.7% each for B and C.
3. Beyond square footage
Size isn't everything. A private bathroom, a balcony, a closet, natural light or street noise can all be worth adjusting for. Agree on it as percentage points: if the room with its own bathroom takes 5 points more, you might land on 45% for A and 27.5% each for B and C. Whatever you choose, write the percentages down at the start.
4. Splitting utilities
Utilities and internet are usually split equally: $180 is $60 each. If one roommate works from home and uses far more power and heating during the day, use shares instead. At 2:1:1, that's $90, $45 and $45.
Some amounts don't divide evenly. $100 for internet split three ways is $33.33 each, with one cent left over, so one person pays $33.34. Rotating who takes the extra cent keeps it fair over the year.
5. A monthly routine
Rent repeats every month, so a simple routine prevents most arguments.
- Create one group for everyone in the flat
- Log the rent with who paid it, split by your agreed percentages
- Log each utility bill under whoever paid it
- Add shared groceries and household supplies to the same group
- At the end of the month, check Settle up and share the result in your group chat
- Tap Sent as each transfer is made, then start the next month
6. When someone moves in or out
Include a new roommate only in expenses from the day they move in, and leave out someone who moved out from expenses after they left. You don't need a new group; keep the history and settle up.
7. Deposits and shared purchases
The security deposit is usually split the same way as the rent, so whoever pays more rent also gets more back when you move out. Write down who put in what. Bigger shared purchases, like a sofa or a vacuum, are worth agreeing on before you buy: split them equally and decide what happens when someone leaves, whether they are bought out or the item stays with the flat.
Small shared costs add up too. Toilet paper, dish soap, trash bags and cleaning supplies are easy to forget, so log them in the same group as the rent and they settle up together at the end of the month.
Splitting rent in Tabkin
Tabkin is an Android app that works well for splitting rent and utilities. Each expense can be split equally, by exact amounts, by shares or by percentages; it shows what's left to assign until it adds up and spreads leftover cents so totals always match. Rent, bills and groceries are categorized automatically from the title, and the Totals tab shows what each person paid, their share, and what they get back or owe. Add a new roommate any time and hide someone who moved out. There's no sign-up, and your data stays on your phone.
FAQ
- Should roommates always split rent by room size?
- There's no single right answer. Similar rooms usually split equally; very different rooms often use room size or a hybrid. Agreeing on the percentages and writing them down matters most.
- Should utilities be split by room size too?
- Usually not. Utilities are normally split equally, or by shares such as 2:1:1 if one person uses a lot more.
- What if the rent doesn't divide evenly?
- Someone takes the extra cent so the total matches. Tabkin distributes the remainder automatically.
- Can I pay rent through the app?
- No. Tabkin doesn't send money. It works out who owes who; people pay as usual, then you tap Sent to record it.
Split rent and bills by your own percentages
Get Tabkin on Google Play