Rent Split Calculator guide
Split rent between roommates by bedroom size, by income, or evenly. Set a share for common areas, add shared bills, and get each person's monthly total in a clean table.
Three ways to split rent
Equal: rent ÷ number of roommates. Simple, and fair when the bedrooms are roughly the same size and nobody gets a private bathroom or a balcony.
By bedroom size: each person's share = their bedroom square footage ÷ total bedroom square footage × rent. The person in the biggest room pays the most. This is the most common fix when rooms are clearly unequal.
By income: each person's share = their income ÷ combined income × rent. Popular with couples and with friends whose earnings differ a lot, because everyone spends the same percentage of their income on housing.
How the calculator handles common space
A pure square-footage split ignores the kitchen, living room, and hallways that everyone uses equally. The common-areas field fixes that: whatever percentage you enter is split evenly, and only the remainder is split by room size or income.
Shared bills, meaning utilities, internet, and streaming, are always split evenly in this calculator. Enter the total for everything you share in the Shared bills field. List roommates one per line as "name, number", where the number is bedroom square feet or annual income depending on the mode. Thousands separators like 85,000 are fine.
Worked example: three bedrooms, $2,400 rent
Alex has a 180 sq ft room, Jordan 140, and Sam 120. Total bedroom space is 440 sq ft. Pure room-size split: Alex pays 180 ÷ 440 × $2,400 = $981.82, Jordan $763.64, Sam $654.55. The gap between the biggest and smallest room is about $327 a month.
Now set common areas to 50 percent. Half the rent, $1,200, is split three ways at $400 each. The other $1,200 is split by room size: Alex $490.91, Jordan $381.82, Sam $327.27. Totals: Alex $890.91, Jordan $781.82, Sam $727.27. The spread shrinks to about $164, which most groups find more reasonable because the shared space is genuinely shared.
Add $240 of utilities and each person pays $80 more on top. An even split of everything would be $880 each, so the calculator also shows that number for reference.
Adjusting for features, not just size
Square footage misses things people care about: a private bathroom, a walk-in closet, a window versus none, street noise, or the only parking spot. The simplest way to price these is to agree on a monthly premium for each feature, then subtract it from the total before splitting. For example, the room with the en-suite pays an extra $100, and the remaining rent is split by size.
Another route is to inflate the measured size. Count the private bathroom's square footage as part of that bedroom. It is objective and hard to argue with.
If the group cannot agree, a bidding approach works: each person writes down what they would pay for each room, and rooms go to the highest bidder with prices scaled so the total equals the rent. It sounds elaborate, but it ends arguments quickly.
What US landlords and leases mean for you
Most US leases are joint and several: every tenant on the lease is responsible for the full rent, not just their share. If a roommate skips out, the landlord can pursue anyone on the lease for the whole amount. Your private split does not change that.
Landlords typically want total household income of about 3 times the monthly rent, so $7,200 a month for $2,400 rent. Some count each roommate's income toward that total; others require a guarantor for anyone below their personal share. Write your split and bill rules into a simple roommate agreement, signed by everyone, so there is a record if things go sideways.
Common mistakes
Measuring rooms inconsistently. Use the same method for every room, wall to wall, with or without closets, and decide before anyone knows which room they want. Forgetting annual changes: when rent goes up at renewal, rerun the split instead of adding the increase to one person's share. And paying the landlord from one person's account without a clear trail. Use a shared payment app or a joint account so everyone can see what was paid.
Frequently asked questions
What is the fairest way to split rent?
When bedrooms differ, most people find splitting by square footage fairest, often with part of the rent (say 30 to 50%) split equally to cover the kitchen, living room, and bathrooms everyone shares.
How do I split rent by room size?
Divide each bedroom's square footage by the total bedroom square footage, then multiply by the rent. Rooms of 180, 140, and 120 sq ft on $2,400 rent pay $981.82, $763.64, and $654.55.
How do I split rent by income?
Each person pays their income divided by the combined income, times the rent. If one partner earns $90,000 and the other $60,000, they pay 60% and 40%: $1,440 and $960 of $2,400.
Should a room with a private bathroom pay more?
Usually yes. A common approach is to count the bathroom's square footage as part of that bedroom, or add a flat premium such as $50 to $150 a month, and take it off the other rooms' shares.
How should couples sharing a room split rent with roommates?
Split by room first, then split the couple's room between them. Many groups also charge the couple a slightly larger share of utilities, since two people use more water and power.
Are utilities split the same way as rent?
In this calculator, shared bills are always split equally because usage rarely tracks bedroom size or income. If one person works from home and runs the AC all day, agree on an adjustment up front.
Is data uploaded?
Everything runs in your browser. Nothing you enter is uploaded to a server or stored by us.
How much should I pay for the master bedroom?
Typically 10 to 25% more than an equal share, depending on how much bigger it is and whether it has a private bathroom. Run the room-size split with a 30 to 50% common-area share to get a defensible number.
Can I split rent between more than three roommates?
Yes. Add one line per person and the calculator handles any number. For a house of five or more, a 40 to 50% common-area share usually keeps the smallest room from feeling overcharged.