Free tools · Roommates
Rent split calculator
Split rent equally, by room size, or by size plus amenities like private bathrooms. See exactly what each room should pay — and what each person in a shared room owes.
Free · No account · Nothing saved
Shares always add up to exactly $3,000.00 — pennies are distributed so nothing goes missing.
How to split rent unevenly (without the fight)
An even split is only fair when the rooms are even. When one bedroom is half the size of another, or one roommate gets a private bathroom, charging everyone the same starts to grate. So split by room instead: the bigger or nicer the room, the bigger the share.
The formula
Give each room a weight: weight = square footage × amenity multipliers. Then each room's rent is total rent × its weight ÷ the sum of all weights.
Example: $3,000 rent, three rooms. A 160 sq ft room with a private bathroom (weight 160 × 1.2 = 192), a 130 sq ft room with a couple (weight 130 × 1.25 = 162.5), and a 100 sq ft room (weight 100). Total weight 454.5, so the rooms pay about $1,267, $1,073 (≈$536 per partner), and $660. Bigger room, bigger share — and everyone can see exactly why.
The multipliers aren't laws of physics — they're starting points for a conversation. Adjust until everyone nods, then lock it in. For the monthly follow-through (rent, utilities, that one roommate who always “forgets” the internet bill), a shared tracker like Split! keeps the agreement honest without anyone playing bill collector.
Frequently asked questions
How should roommates split rent fairly?+
If the rooms are basically identical, split evenly. If they differ, the most widely accepted approach is proportional to room value: weight each room by its size, then adjust for meaningful perks like a private bathroom. Each room pays its weight's share of the total rent. The important part is agreeing on the method together before anyone signs.
How does the size + features method work?+
Each room's weight starts at its square footage. A private bathroom multiplies the weight by 1.2 (worth roughly 20% more), and a couple sharing the room multiplies it by 1.25 (more wear, utilities, and shared-space use). Rent is then divided in proportion to the weights, so the numbers always sum to exactly the total rent.
Should a couple sharing one room pay more rent?+
Usually yes — two people use more of the shared spaces, utilities, and parking even though they occupy one room. A common approach is valuing the couple's room 20–30% higher (this calculator uses +25%), then the couple splits their room's rent between themselves. Some households instead split by the number of people rather than rooms; the right answer is whatever everyone agrees feels fair.
Do common areas like the living room count?+
In the standard approach, no — common areas benefit everyone equally, so their cost is spread evenly by default. You only weight the parts that are exclusive: bedrooms and private bathrooms. That's why the calculator asks for bedroom size, not apartment size.
How do we split utilities and other shared bills?+
Utilities are usually split evenly per person (not per room), since usage doesn't depend on room size. If incomes differ a lot, some households prefer splitting bills proportionally to income — try our split bills by income calculator for that.
Is this rent split calculator free?+
Yes — free, no account, and nothing is saved or sent anywhere. If you want to track rent, utilities, and groceries with your roommates every month, Split! does that for free too, with no expense limits.
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