Rent Split Calculator
Not all rooms are equal. Enter your rent and each room's features to get a weighted split your whole house actually agrees is fair.
Suggested Split
$3,000 / monthHow the fair rent split works
A simple, transparent algorithm that turns subjective room comparisons into objective dollar amounts.
Every room starts equal
Each bedroom begins with a base score of 100 points. This is the baseline before any room features are taken into account — it represents a perfectly average room.
Attributes adjust the score
Room features are added or subtracted from the base score. A private en-suite bathroom adds 20 points. A walk-in closet adds 10. Being on a noisy street corner subtracts 10. A significantly smaller room subtracts 15. Every adjustment reflects real rental market value.
Each person pays their proportion
Once all rooms are scored, each roommate's rent share is their room score divided by the sum of all scores, multiplied by total rent. If three rooms score 150, 105, and 60 (total 315), the first roommate pays 47.6%, the second 33.3%, and the third 19.1%.
Everyone agrees before moving in
The value of a weighted split isn't just the math — it's the conversation. When the process is transparent and agreed upon before the lease is signed, there's no resentment about who pays what later.
Frequently asked questions
Everything roommates want to know before splitting rent.
Should roommates split rent equally?
Equal splits only make sense when all rooms are identical — and that's rare. In most apartments, bedrooms differ meaningfully in size, natural light, bathroom access, and closet space. These differences have real market value. A weighted split, where each person pays proportional to what their room offers, is fairer and leads to far less conflict over time.
How do you split rent fairly when rooms are different sizes?
Assign each room a score based on its features: size, bathroom access, closet type, light, noise exposure, and other factors. Each roommate then pays a share proportional to their room's score out of the total. For example, if three rooms score 150, 105, and 60, the respective shares are 47.6%, 33.3%, and 19.1% of rent — regardless of how much that rent is.
What factors should affect a rent split?
The features that most affect a room's value are: room size (small, medium, large, or master), private bathroom (a significant premium), closet size (walk-in vs. standard vs. none), natural light, balcony or private outdoor space, private entrance, noise exposure from traffic or neighbors, and whether the room is significantly smaller than the others.
Is it common to split rent by room size?
Yes, and it's becoming the norm in cities where apartment rooms vary wildly. Many households do it manually with spreadsheets, which works but invites endless debate over the numbers. A standardized calculator removes the subjectivity and gives everyone a shared reference point — which is the real goal.
How do I split rent with 3 roommates?
Select 3 roommates in the calculator, enter each person's name, and configure their room. The tool handles the math — each of the three pays proportionally to their room's score. You can share the result with your roommates by screenshot or sending them this page link and walking through it together.
What if my roommate disagrees with the split?
The key is agreeing on the method before looking at dollar amounts. Bring up this calculator early — ideally before signing the lease — and have each person score their own room while others weigh in. When the process is transparent and collaborative, the final numbers are much easier to accept, even if someone gets a higher share.
Can I use this for just 2 roommates?
Absolutely. Select 2 roommates from the dropdown. The weighted split formula works the same way — each person pays proportionally to their room score, no matter how many roommates there are. Two-person splits are actually the easiest to negotiate because you only need one other person to agree.
How accurate is the calculator?
The point values are based on relative rental market premiums — not a precise academic study. A private bathroom really does command roughly a 15–25% premium over a shared one in the rental market, and room size correlates strongly with rent in listings. The calculator gives you a defensible, consistent starting point. Fine-tune the scores together if your household has strong feelings about a specific feature.
Want more than just a calculator?
RoomieOps tracks shared expenses, chore rotations, house agreements, and reputation scores — so your whole household runs on autopilot.