Rent Split by Room Size Calculator

It charges every square foot of the home at the same price. It adds up all the private room areas plus the shared common space, divides your total rent by that area to get a price per square foot, then bills each roommate for their own room plus an equal share of the common space at that same rate. Because the parts cover the whole home, the shares always add up to your full rent.

Common areas like the living room, kitchen, hallways, and bathrooms are split evenly across all roommates, since everyone uses them equally. Each person's billable area is their private room square footage plus the shared area divided by the number of roommates. That shared slice is priced at the same per square foot rate as the bedrooms, so nobody pays a different rate for the same space.

Measure the floor area of each private bedroom in square feet, which is length times width, and enter it for that roommate. Put the combined area of all shared spaces, such as the living room, kitchen, and bathrooms, in the shared space field, or use 0 to split by bedrooms only. You do not need a professional survey; close estimates from a tape measure or the floor plan work fine.

An even split charges everyone the same amount no matter how big their room is, so a roommate in a small bedroom ends up subsidizing one in the large bedroom. This calculator shows the even split next to each fair share so you can see exactly how much more or less each person pays. The bigger the size gap between rooms, the larger that difference becomes.

No. The square footage method handles size, but it does not account for a private bathroom, a balcony, extra closets, natural light, noise, or being next to the kitchen. If a room has a clear perk or drawback, agree on a flat dollar adjustment with your roommates and apply it on top of the size-based split.

Use the results as a fair starting point for a conversation, not a binding rule. The split is a math-based estimate, not financial or legal advice, and your lease still governs who owes what to the landlord. Write down whatever you agree on, including any adjustments, so every roommate has a clear record.