Master bedroom
Enter the total rent, bedroom sizes, and any master-bedroom extras to estimate a fair monthly premium your roommates can review.
Use this page when the group is choosing between a master bedroom and a smaller bedroom, or when someone already has the primary bedroom and wants a neutral way to review the monthly difference.
It is intentionally narrower than the main calculator. The preset keeps the comparison to two rooms so the result can answer the practical question: how much more does the master bedroom pay each month?
The preset starts with $3,200 total rent, a 180 sq ft master bedroom, a 120 sq ft smaller room, a private full bath premium, a small extra feature adjustment, one person in each room, and 20% common-space share.
Change those assumptions to match your apartment. The result updates the master bedroom amount, the smaller room amount, the monthly difference, and a copyable explanation roommates can review.
If you have three or more different rooms, start with the uneven rooms calculator. If the only thing you want is a pure area formula, use the square-footage calculator. If the room size is similar and the main question is bathroom access, use the private bathroom page.
If the master bedroom has two people in it, keep this page focused on rent and use common-space share for the portion that should reflect people count. Utilities, deposits, and lease obligations may need a separate rule.
It often makes sense for the master bedroom to pay more when it is larger, more private, or includes a meaningful extra such as an ensuite bathroom. The amount should still be an assumption roommates can review, not a rule that overrides a lease or prior agreement.
A clear starting point is to split the bedroom portion of rent by bedroom square footage, then add visible premiums for extras the group agrees to count. The calculator shows the bigger room amount, the smaller room amount, and the monthly difference.
There is no universal private bathroom premium. A fixed monthly amount is usually easier to discuss than hiding bathroom value inside square footage. Reduce the premium if the bathroom is not meaningfully private or is regularly used by guests or other roommates.
Room size is usually the cleaner starting point for private bedroom value. Common space can matter when people per room differs, such as a couple sharing the master bedroom. Use the common-space share only for the portion of rent your group wants to split by people.
Roommates can discuss changing a rent split, but this calculator does not change a lease, signed agreement, or payment pattern by itself. Use the result as a discussion aid and check any agreement or local requirement separately.
No. RentSplit is not legal advice and does not decide what anyone is required to pay. It is a calculator for reviewing assumptions and copying a neutral explanation.