Roommate Rent Split Calculator
Splitting rent with roommates shouldn't start an argument. Our free roommate rent split calculator divides your rent by bedroom size — the method most roommates consider fair — or evenly, and splits utilities evenly on top. Enter your rent, each room's size, and see everyone's monthly share instantly.
Enter your numbers
Your results
| Person | Rent share | Utility share | Total |
|---|
Estimate: shares are rounded to the nearest cent, so totals may differ from the exact inputs by a penny. This is a starting point — actual agreements between roommates may vary.
How to use this calculator
Enter your total monthly rent and any utilities you share (electricity, water, internet — leave it at 0 if you don't track them). Pick the number of roommates and choose a split method: By room size (fair) divides the rent proportionally to each bedroom's square footage, while Even split divides everything equally. Measure each bedroom (length × width in feet) and enter the square footage — results update instantly as you type.
How it works
The room-size method is the common square-footage approach used by most roommate groups: each person's rent share = total rent × (their room's sq ft ÷ total bedroom sq ft). Someone with a 200 sq ft room in a 500 sq ft total pays 40% of the rent. Utilities are split evenly among all roommates, since usage isn't tied to room size, so each person's total = rent share + utility share.
The even method simply divides everything: (rent + utilities) ÷ number of roommates. This is an estimate only — if one person has an en-suite bathroom or pays for extras like parking, adjust the shares to reflect that. Actual agreements between roommates vary, so treat the output as a fair starting point for your discussion.
Frequently asked questions
What is the fairest way to split rent between roommates?
The fairest common method is proportional to room size: each person pays a share of the rent matching their bedroom's square footage as a fraction of the total bedroom space. A 200 sq ft room in a 500 sq ft total means paying 40% of the rent. Larger rooms are simply worth more, which is why the square-footage method causes fewer arguments.
Should I split rent by room size or evenly?
Split by room size when the bedrooms differ noticeably — it's what most roommates consider fair, since bigger rooms are worth more. Split evenly only when the rooms are roughly the same size; the two methods then give nearly identical shares, so the simpler even split wins.
Should utilities be included in the rent split?
Utilities like electricity, water, and internet are usually split evenly, not by room size, because usage isn't tied to bedroom square footage. The approach this calculator uses: rent by room size, utilities evenly. That's the most common arrangement roommates agree on.
What if all the rooms are the same size?
Then splitting the total evenly is the simplest and fairest approach. With identical rooms, the room-size method and the even method produce the same answer — flip between the two toggles above and you'll see matching shares.
Should the master bedroom pay more rent?
Usually yes. A master bedroom with a private bathroom or significantly more space is worth more, so roommates commonly add a premium — for example, treating its square footage as 10–20% larger in the calculation, or agreeing on a fixed monthly premium before splitting the rest.