Splitting Rent With Different Room Sizes (Three Fair Methods, With the Math)
When bedrooms differ in size, roommates usually split rent one of three ways: by bedroom size alone, by splitting shared space evenly and bedrooms by size, or by adjusting for features like a private bathroom. The second is common because everyone uses the kitchen and living room equally.
- Bedroom size only: rent in proportion to each bedroom's square footage.
- Shared space evenly, bedrooms by size: the most common middle ground.
- Features or bids: price extras like a private bathroom, or let each person bid.
Splitting rent with different room sizes usually means dividing the cost of shared space equally and the cost of private bedrooms in proportion to their size, sometimes with adjustments for features such as a private bathroom. There is no legal formula; it's an agreement among roommates, and writing it down helps. Who is responsible to the landlord depends on whose name is on the lease and on state law; New York's attorney general, for instance, publishes guidance on roommates and security deposits.
An even split is simple, and when rooms are about the same it's often the fairest. But when one bedroom is half again as big or has the private bathroom, an even split means one person quietly subsidizes the other. That rarely causes a fight on move-in day; it tends to surface months later in an argument about something else.
How do you split rent when bedrooms are different sizes?
Two roommates share a $2,400-a-month apartment of 1,000 square feet. Bedroom A is 180 square feet. Bedroom B is 120 square feet. The remaining 700 square feet (kitchen, living room, hallway, shared bathroom) is used by both. An even split would be $1,200 each. The methods below give different answers for the same apartment, which is exactly why it helps to agree on one in advance.
How do you split rent by square footage?
Divide the rent in proportion to the bedrooms. Together the bedrooms are 300 square feet, so A has 60% and B has 40%: $1,440 and $960. This is simple, but it treats the shared space as if it belonged to whoever has the bigger bedroom, and both people use the kitchen and living room equally. For most apartments this method overcharges the larger room, which is why it is less common than the next one.
What is the fairest way to split rent between roommates?
Split the cost of the shared space evenly and the cost of the bedrooms by size. The shared 700 square feet is 70% of the apartment, or $1,680, so each person pays $840 for it. The bedrooms are the other 30%, or $720, split 60/40: $432 for A and $288 for B. Totals: A pays $1,272 and B pays $1,128. The difference, $144 a month, reflects the extra 60 square feet of private space. Many roommates find this one feels fair because it matches how the apartment is actually used.
How much more should you pay for a private bathroom?
Size is not the only thing that matters. A private bathroom, a walk-in closet, a balcony, a parking spot, or a quieter side of the building can be worth more than square footage. One approach is to agree on a monthly value for each feature, say $75 for a private bathroom, and add it to that room's share while subtracting it from the other. Another is bidding: each person writes down the most they would pay for each room, and the rooms and amounts are set so that nobody would rather swap. Free online rent-division calculators run this kind of bidding for you.
What else should roommates agree on besides rent?
Utilities and internet are usually split evenly, since use is hard to measure, though a person working from home all day sometimes pays a bit more. The deposit is often split in the same proportion as the rent. And it helps to agree in writing on what happens when someone moves out, who finds the replacement, and whether the split is revisited if circumstances change. Writing the agreed numbers down, even in a shared note, keeps the conversation from having to happen twice. Chores are the other common sore spot: see how to split household chores fairly, and how to talk to your roommate about a problem if a conversation is already overdue.
Sources
Get the number, and the words for the conversation.
Tell Money Diplomat about the rooms, the rent, and what each person cares about. It works out a split that fits your situation and gives you a way to bring it up, so the money conversation happens once and calmly.
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