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Rent Split Calculator
Sharing a place? Divide the rent by bedroom size, equally or by income, with optional extras for a private bathroom or a parking spot. The shares add up to the exact total — then write them into a roommate agreement in one click.
Roommates
Each person pays
| Person | Basis | Share | Pays |
|---|---|---|---|
| Total | 100% |
Our roommate agreement has signature lines for two roommates. The split it receives lists everyone; with three or more, add the other names and signatures by hand, or build your own version with the custom document builder.
Write it into a roommate agreementEnter the total rent and each roommate’s room size (or income) to see the split. Nothing you type leaves your browser.
How the split is calculated
- Extras first. If a room has a private bathroom or someone gets the parking spot, that person pays the monthly value you agreed for it.
- Split the rest. What is left of the rent is divided in proportion to bedroom size (sq ft), equally, or in proportion to income.
- Round to the cent. The last person absorbs the rounding difference, so the shares add up to exactly the total rent.
Example: $3,000 with bedrooms of 150, 120, 100 sq ft splits as $1,216.22, $972.97, $810.81 by size — or $1,275.68, $940.54, $783.78 if the largest room’s private bathroom is valued at $100. Moving in mid-month? The prorated rent calculator works out the first partial month.
Frequently asked questions
How do you split rent by room size?
Add up the bedroom areas, divide each bedroom by that total and multiply by the rent. For $3,000 and bedrooms of 150, 120, 100 sq ft (370 sq ft in all): 150 ÷ 370 × $3,000 = $1,216.22; 120 ÷ 370 × $3,000 = $972.97; 100 ÷ 370 × $3,000 = $810.81. Shared spaces end up divided in the same proportion as the bedrooms.
How should a private bathroom or a parking spot change the split?
Agree on a monthly value for each extra, charge it to whoever gets it, and split the rest. With a $100 private-bathroom value on the 150 sq ft room, $2,900 is split by size and that roommate adds the $100: $1,275.68, $940.54, $783.78. The calculator does not suggest a value — you agree on it together.
How does splitting rent by income work?
Each person pays the same share of the rent as their share of the household income. Two roommates earning $60,000 and $40,000 a year split $2,400 as $1,440.00, $960.00. Use the same period for everyone — all monthly or all yearly — or the result is meaningless.
Is it fairer to split by room size, equally or by income?
None is “the” fair answer: equal shares suit similar rooms, size-based shares suit rooms that differ a lot, and income-based shares suit partners or friends who pool costs. The important part is that everyone agrees on the method before signing — and writes it down.
Do the shares always add up to the total rent?
Yes. Each share is rounded to the cent and the last person on the list absorbs the rounding difference (at most a few cents), so the shares add up to exactly the rent you entered.
How do we put the split in writing?
Use “Write it into a roommate agreement”: it opens our free roommate agreement with the total rent and each person’s share already filled in, next to deposits, utilities and the move-out notice. Check the figures, add names and the due date, and download the PDF.
Arithmetic only — how roommates divide the rent among themselves is their agreement to make.
Roommate