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?
Rent Split Calculator: Divide Rent Fairly Among Roommates
Finding a fair way to split rent is one of the first — and most important — decisions you'll make when moving in with roommates. Use the wrong method and someone ends up overpaying for months, quietly frustrated with an arrangement that was never actually equitable. A good rent split calculator removes the guesswork and gives everyone a number they can see is fair.
Fair Rent Split is a free rent calculator for roommates that goes beyond simple division. Instead of just dividing the total by the number of people, it accounts for the real value of each bedroom: its square footage, whether it has a private bathroom, the size of the closet, natural light, balcony access, and other features that affect how much each room is actually worth. The result is a transparent, line-by-line breakdown that explains every dollar — not just a number.
Three ways to divide rent
The best divide rent calculator gives you options, because different apartments call for different approaches.
Equal Split is the fastest method. Enter the total rent and number of roommates and get an instant per-person figure. It works well when all bedrooms are roughly the same size and equally appointed — but most apartments aren't built that way.
Split by Room Size is the most defensible approach when bedrooms differ in square footage. Enter each bedroom's dimensions (or square footage directly), plus the total apartment size. Fair Rent Split calculates each room's proportional share of the private space, then adds an equal per-person share of the common areas — kitchen, living room, hallways. If a couple shares one room, the calculator handles it correctly: the room pays a proportional share, then the two occupants divide that amount between themselves.
Split by Features is the most thorough method. Each room gets a base score from its square footage, then feature premiums or discounts are added: +100 points for a private full bathroom, +40 for a balcony, +30 for a walk-in closet, −50 for a basement location, and so on. The final rent for each room is calculated proportionally from those scores. Every factor is shown in the breakdown, so roommates can see exactly why each share is what it is — and challenge any individual adjustment rather than arguing about the total.
How this compares to a Splitwise rent calculator
Splitwise is excellent for tracking who paid what and splitting recurring expenses. But it doesn't calculate how to divide rent in the first place — it assumes you've already agreed on a number per person. That's the gap a dedicated splitwise rent calculator alternative like Fair Rent Split fills. Use Fair Rent Split to agree on the monthly amount each person owes, then use Splitwise (or Venmo, or any payment app) to track and settle up.
Rent split calculator by income
Some roommates prefer a rent split calculator by income — the higher earner pays more, regardless of room size. This is a valid social agreement, but it isn't what most rent calculators compute, and it can create resentment over time if one person feels they're subsidising another. Fair Rent Split focuses on the objective value of each room: its size, its amenities, and the features it does or doesn't have. This produces a result that's verifiable and transparent — anyone can check the math.
If you prefer an income-based split, use Fair Rent Split to establish a fair room-value baseline first, then adjust from there. Starting with an objective baseline means any income-based adjustment is deliberate and agreed upon — not an accident of an incomplete calculation.
Free, private, and no account required
Fair Rent Split is completely free. There's no signup, no email address required, and no data is collected or sent to any server. Your calculation runs entirely in your browser. You can share the full result with roommates via a shareable URL — everything they need to review the split is encoded in the link.
Whether you're dividing rent for two people in a studio or five roommates across a large apartment, Fair Rent Split gives you a clear, defensible starting point for the conversation — and a breakdown that makes it easy to get everyone on the same page.
Rent split by square footage
The most defensible way to split rent when rooms differ in size is square footage. Fair Rent Split calculates each bedroom's proportional share of the total floor area, then adds an equal per-person share of the common spaces.
If a couple shares one room, the calculator handles it correctly: the room pays a proportional share based on its size, and the two occupants divide that amount between themselves.
Unequal rent split calculator
When bedrooms are clearly unequal — one has a private bathroom, another is a basement room, a third gets all the natural light — an equal split is objectively unfair. The feature-based method assigns transparent point values to each amenity and calculates rent proportionally. Every factor is visible in the breakdown so roommates can agree on specific adjustments rather than arguing about the final number.
Master bedroom rent calculator
A master bedroom combines several advantages: larger size, private bathroom, walk-in closet, and sometimes a balcony. Fair Rent Split adds each premium separately and shows the combined effect on monthly rent. The master bedroom occupant can see exactly what they're paying for; smaller-room occupants can see exactly why their share is lower.
Rent calculator for roommates with couples
When a couple shares one bedroom, most calculators don't handle it cleanly. Fair Rent Split lets you enter the number of occupants per room. The room's rent share is calculated by its size and features, then divided equally between the two occupants — keeping per-person costs visible alongside per-room costs.