Free · No signup · No data collected
Rent Split Calculator
for roommates.
Divide rent fairly by room size, private bathrooms, closets, and other features. Transparent breakdown. Free. No signup.
Add each bedroom. Enter width × length or square footage directly.
Add each room and select its features. The calculator assigns values to each feature transparently.
Feature adjustment values ▾
Relative weights — not fixed dollar amounts. Edit to match your apartment.
Shared Expenses
Monthly shared costs
Split utilities, internet, and recurring costs on top of rent.
How it works
Most calculators give you a number. We show you why.
Fair Rent Split is the only free calculator that answers both questions roommates actually need: how much do I pay, and why is that fair.
Three calculation methods
Equal split, proportional by square footage, or fully weighted by room features. Choose what works for your situation.
Line-by-line breakdown
See exactly how each dollar was calculated — base space, private bathroom premium, closet type, natural light, and more.
Fairness score
A 0–100 score that tells you how balanced your living situation is and how much it matters which split method you use.
Shareable link
Share the full calculation with your roommates via URL. No account needed — everything is encoded in the link.
Saves automatically
Your current calculation is saved locally in the browser. Come back anytime and pick up where you left off.
Completely free
No signup, no email, no ads, no data collection. Fair Rent Split is a free utility built for roommates.
Split Methods
Three ways to split rent
Equal Split
Divide the total monthly rent equally among all roommates. Simple, fast, and fair when all rooms are roughly equivalent.
Best for: Apartments with similar bedrooms, roommates who prefer simplicity.
Split by Room Size
Each bedroom's share is proportional to its square footage. Common areas (kitchen, living room, hallways) are divided equally per person. Supports couples sharing a room.
Best for: Apartments where bedrooms vary significantly in size. Enter the total apartment size to enable accurate common area splits.
Fair Split by Features
The most comprehensive method. Each room is scored on size plus amenities: bathroom type, closet size, natural light, balcony, parking, and negative factors like poor sound isolation or basement location. The score determines each room's proportion of the total rent.
Best for: Any apartment with real differences between rooms. Produces the most defensible result you can show your roommates.
How scores work
Each room starts with a base score equal to its square footage (or 100 points if no size is entered). Feature premiums and discounts are added to this base. The final rent is calculated as room_score / total_score × total_rent, so the sum always equals the exact monthly rent you entered.
FAQ
Common questions
How should roommates split rent fairly?
Should the bigger bedroom pay more rent?
How do you split rent based on room size?
How much extra should a private bathroom cost?
How do you split rent when a couple shares one bedroom?
Should common areas be split equally?
Is splitting rent by income fair?
How do you split rent when bedrooms are different sizes?
A fair way to divide rent among roommates
Splitting rent evenly by headcount is easy — but it only feels fair when every bedroom is roughly the same. The moment one person gets a bigger room, a private bathroom, or a walk-in closet while someone else is in a small room with no closet, an even split quietly shortchanges one of you. Fair Rent Split exists to make that conversation easier by turning "what feels fair" into a number everyone can see and check.
Three ways to divide rent
Equal Split is the fastest option: enter the total rent and the number of roommates for an instant per-person figure. It works well when bedrooms are genuinely comparable.
Split by Room Size is the more defensible option when bedrooms differ in square footage. Enter each bedroom's size and the apartment's total size, and each room pays its proportional share of the private space, plus an equal per-person share of common areas like the kitchen and living room. If two people share one bedroom, that room's cost is split between them after the room's own share is calculated.
Split by Features goes a step further, adding transparent premiums or discounts for things like a private bathroom, a walk-in closet, natural light, or a basement location. Every adjustment is shown in the breakdown, and you can edit the point values yourself if you and your roommates disagree with the defaults — the goal is a number you can all interrogate, not one you're asked to trust blindly.
It's worth noting what this tool isn't: it doesn't track who's already paid what, the way an expense-splitting app does. It's meant to help you agree on the monthly number in the first place — after that, use whatever payment app you already like to actually settle up.
Some households prefer to weight the split by income rather than room value — the higher earner pays more, regardless of room size. That's a reasonable arrangement between roommates, just a different one than what this tool calculates directly. A common approach is to start from an objective room-value baseline here, then adjust it by agreement from there, so any income-based adjustment is a deliberate choice rather than a guess.
The whole thing runs in your browser — no signup, no data collected, nothing sent to a server. Share a result with your roommates using a link that encodes the full calculation, so everyone can see exactly how the number was reached.