Rent Split Calculator
Rooms are rarely the same size. Split rent evenly, by bedroom square footage, or by income — with adjustments for a private bathroom or other perks — and get a number everyone can actually agree on.
The Three Ways to Split Rent
1. Evenly
each share = total rent ÷ number of roommates
Simplest and least argued-about. Genuinely fair when bedrooms are comparable in size and nobody has a private bathroom. Becomes contentious fast when one room is noticeably better.
2. By room size
each share = (your room sq ft ÷ total bedroom sq ft) × total rent
The most defensible method when rooms differ, because square footage is measurable and nobody has to disclose anything personal. Shared space is deliberately excluded — everyone uses the kitchen and living room equally, so only private bedrooms are weighted.
3. By income
each share = (your income ÷ combined income) × total rent
Everyone pays the same percentage of what they earn rather than the same dollar amount. Common among couples and close friends with a large income gap. Requires honest disclosure, has to be renegotiated when incomes change, and can feel unfair to the higher earner who gets no extra space for the extra money.
A Worked Example
A $2,000 two-bedroom, where one bedroom is 200 sq ft with an en-suite bathroom and the other is 150 sq ft:
| Method | Room A (200 sq ft, en-suite) | Room B (150 sq ft) |
|---|---|---|
| Evenly | $1,000 | $1,000 |
| By size | $1,143 | $857 |
| By size + 15% en-suite | $1,247 | $753 |
Nearly $500 a month separates the first row from the last. That gap is why this is worth ten minutes and a tape measure before anyone signs.
What Else Roommates Price In
Square footage is the starting point, not the whole story. Common adjustments, using the perk field above:
- Private or en-suite bathroom — the big one, commonly 10–20%
- Walk-in closet or extra storage — usually 5%
- Private balcony or direct outdoor access — 5–10%
- Windows, light, and noise — a dark room facing a busy street is worth less than its square footage suggests
- Parking space — often priced separately at local market rate rather than as a percentage
One Thing Every Roommate Should Know
Your split is a private agreement. Your lease probably is not. Most multi-tenant leases are joint and several, meaning each tenant is liable for the entire rent — not just their share. If a roommate stops paying or disappears, the landlord can come after everyone else for the full amount. Agreeing on a split does not change that, which is precisely why you should write the split down, date it, and have everyone sign it.
Getting It in Writing
Once you have a number everyone accepts, record it. A short written agreement covering who pays what, who pays which utilities, how the security deposit is divided at move-out, and what happens if someone leaves early prevents nearly every roommate money argument.
Moving in partway through a month? The prorated rent calculator gives the partial-month figure, and the rent ledger template tracks who has paid what.
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Renting Out a Place With Roommates?
Kelpic tracks rent per tenant, so you can see who has paid and who has not across a shared lease — without reconciling one lump payment against four people every month.
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