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Roommate rent split calculator

Split one total rent across roommates — evenly, or in proportion to each room’s square footage. Enter the rent and the rooms; the shares are computed from your own numbers.
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The short answer
How it works
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Make the result useful
Questions landlords ask
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Roommate rent split calculator
Rent & lease
Last updated: July 2026
1. Enter the total monthly rent for the whole apartment or house.
How it works
2. Choose a method: an equal split across a number of roommates, or a split weighted by room size.
How it works
3. For the room-size method, add a row per bedroom with its square footage — shared spaces like the kitchen and living room are treated as common and left out.
How it works
4. The tool shows each person’s share: rent ÷ people for the even split, or rent × (room sq ft ÷ total bedroom sq ft) for the weighted one.
How it works
5. How does the by-room-size split work?
Questions landlords ask
6. Is square footage the fairest way to split rent?
Questions landlords ask
7. What does this tool not tell me?
Questions landlords ask
Roommate rent split calculator
Category
Rent & lease
Last updated
July 2026
The assumptions that move this result
Total rent
Full recurring rent.
Method
Equal or size-proportional split.
Room sizes
Private-room area used for weighting.
Roommates
People included in the split.
The short answer
1. Enter the total monthly rent for the whole apartment or house.
A roommate rent split divides total rent either equally or in proportion to room size. Equal split: rent ÷ number of roommates. By room size: rent × (your room’s square feet ÷ total bedroom square feet). On $3,000 rent, a 150 sq ft room out of 400 total sq ft pays $1,125.
The short answer
Last updated: July 2026
A roommate rent split divides total rent either equally or in proportion to room size. Equal split: rent ÷ number of roommates. By room size: rent × (your room’s square feet ÷ total bedroom square feet). On $3,000 rent, a 150 sq ft room out of 400 total sq ft pays $1,125.
After the estimate:
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Roommate rent split calculator
Split the rent across roommates.
Divide one total rent evenly, or in proportion to each room's square footage. Enter the rent, pick a method, and see everyone's share.
Total monthly rent
$
Split method
Equal split
By room size
Number of roommates
3
Input-driven result
Your inputs
Formula
Result below
Per-person share
$1,066.67
$3,200 split evenly across 3 roommates.
Estimate based on your inputs. Not a promise of results.
Estimate only. Room size is one fair way to weight a split — roommates often also adjust for private bathrooms, closets, light, or noise. What each person actually pays is whatever your roommate agreement says.
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Watch it work
How it works

How this tool works.

Splitting rent evenly is easy until the rooms aren’t even. When one roommate gets the big room with the closet and another gets the converted den, a flat split starts to feel unfair — and “feels unfair” is how roommate arrangements fall apart. A square-footage split is the simplest objective alternative: each person pays in proportion to the private space they actually get.
This calculator does both. Enter the total rent, then either pick the number of roommates for an even split, or list each bedroom with its square footage and let the tool weight the shares. The output is arithmetic on the numbers you enter — a starting point for the conversation, not a ruling on what’s fair in your household.
1
Enter the total monthly rent for the whole apartment or house.
2
Choose a method: an equal split across a number of roommates, or a split weighted by room size.
3
For the room-size method, add a row per bedroom with its square footage — shared spaces like the kitchen and living room are treated as common and left out.
4
The tool shows each person’s share: rent ÷ people for the even split, or rent × (room sq ft ÷ total bedroom sq ft) for the weighted one.
Make the result useful

Roommate rent-split agreement

Total rent is the full recurring amount due under the lease.
Split method is equal or proportional to the room measure selected.
Room sizes describe private rooms, not necessarily shared-space value.
The calculated share is an agreement aid, not a change to lease liability.

The assumptions that move this result

Total rent
Full recurring rent.
Method
Equal or size-proportional split.
Room sizes
Private-room area used for weighting.
Roommates
People included in the split.

Calculation lens

equal share = total rent ÷ roommates; size share = total rent × room size ÷ total room sizes
Use the output as a documented scenario result, not a guarantee.

Read the number in context

Worked scenario
Scenario: $2,400 split equally by two is $1,200 each.
Edge case
Edge case: unequal amenities can justify a negotiated method beyond square feet.
Does not alter joint-and-several lease obligations.
Worked formula
equal share = total rent ÷ roommates; size share = total rent × room size ÷ total room sizes
Questions landlords ask

Questions about this tool and its limits.

How does the by-room-size split work?

Each room’s share is the total rent multiplied by that room’s square footage divided by the combined square footage of all bedrooms. So a 150 sq ft room in a set of bedrooms totaling 400 sq ft carries 37.5% of the rent. Common areas are assumed shared equally and don’t enter the math.

Is square footage the fairest way to split rent?

It’s one defensible way, not the only one. Roommates often adjust for things square footage misses — a private bathroom, natural light, street noise, closet space. Use the room-size result as a baseline, then negotiate adjustments everyone accepts.

What does this tool not tell me?

It doesn’t know your lease or your roommate agreement. Most leases make co-tenants jointly responsible for the full rent regardless of any private split — if one roommate doesn’t pay, the landlord can usually look to the others. Your internal split is an agreement among roommates, not a change to the lease.

Should utilities be split the same way?

Not necessarily. Utilities track usage and headcount more than room size, so many households split them evenly even when rent is weighted. We have a separate utility bill split calculator for that.

Before you act

Agree method before move-in.
Write shares down.
Confirm lease payment responsibility.
Editorial ownership
Written and maintained by the Aptoria editorial team
Editorial method reviewed July 28, 2026. Aptoria reviews scope, source fit, examples, limitations, links, and publication gates. This record does not claim attorney, CPA, lender, appraiser, or other independent professional sign-off.
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Aptoria was built by an owner-operator managing a Brooklyn portfolio — the 11pm calls, the awkward rent texts, the April receipt-pile — not by a software team guessing at the problem.
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