Split Rent Calculator
Work out exactly how much each roommate owes toward rent: split evenly, by room size, or by income. No account needed.
How do you split rent fairly among roommates?
The simplest fair split divides the total rent evenly across everyone. When rooms differ in size, light, or a private bathroom, splitting by each room's share of the total space is usually considered fairer than a flat equal split. Enter your numbers and this calculator works out each person's exact share instantly.
Calculate your split
At 100% the whole rent is divided by room size, which is the usual starting point. Set it to 50% to 70% if your home has a lot of shared space you all use equally: the rest is then split per person.
Your incomes never leave this page. Nothing is sent over the network and nothing is saved.
Each roommate owes
| Roommate | Share | Amount |
|---|---|---|
| Roommate 1 | 33.33% | $600.00 |
| Roommate 2 | 33.33% | $600.00 |
| Roommate 3 | 33.33% | $600.00 |
| Total | $1,800.00 |
How this is calculated: an equal split gives every person the same share, or one share per room when you count a couple's room as one. By income, each person pays the same proportion of the rent as they earn of the combined income. By room size, the slider sets how much of the rent is bedroom rent: that part is divided by floor area, a room with its own bathroom counts as 100 sq ft (9 m²) larger, and whatever the slider leaves over is shared space and is divided per head, so the kitchen and the living room cost every person the same. Custom lets you type any percentages. Amounts are rounded to the nearest cent; any leftover cents from rounding are spread one cent at a time across the group, so the total always adds up to your exact rent, never a cent over or under.
When does splitting by room size make more sense?
An equal split works well when the rooms in your home are roughly the same size and none of them has an obvious advantage, like a private bathroom or a walk-in closet. Once one room is noticeably bigger, brighter, or comes with an extra perk, splitting proportionally to each room's share of the total space is usually the fairer call — and it heads off the "why am I paying the same for the smaller room?" conversation before it starts.
Worked example: a $1,800 monthly rent, three rooms sized 50%, 30%, and 20% of the shared space.
Room A (50%) pays $900.00 · Room B (30%) pays $540.00 · Room C (20%) pays $360.00 — the three shares add up to exactly $1,800.00.
How do you split rent by square footage?
Measure each bedroom, add up the floor area, and give every room the same share of the rent as it has of the total bedroom space. That is the usual starting point, and it is what the calculator does out of the box: pick the By room size mode, type each room in square feet or square metres, and the slider stays at 100%. A room with its own bathroom is counted as 100 sq ft (9 m²) larger than it measures, which is a simple way to price the extra privacy. If your home has a lot of shared space that everyone uses the same way, slide the bedroom share down to 50% or 70%: the part you take out becomes a common pool and is divided per person instead of by room.
Worked example: a $1,800 monthly rent and three bedrooms of 200, 150 and 100 sq ft, with the slider at the default 100%.
The rooms hold 450 sq ft between them, so the shares are 200/450, 150/450 and 100/450: $800.00, $600.00 and $400.00, adding up to exactly $1,800.00.
Move the slider to 50% and $900.00 becomes shared rent at $300.00 per person, while the bedroom half splits $400.00, $300.00 and $200.00. The three roommates then pay $700.00, $600.00 and $500.00.
How do you split rent based on income?
Give each roommate a share equal to their portion of the combined income. Two roommates earning $3,000 and $2,000 a month split a $1,800 rent as 60% and 40%: $1,080.00 and $720.00. Pick the By income mode, type each monthly income, and the calculator turns them into percentages and amounts for you. Your incomes never leave this page: nothing is sent over the network and nothing is saved.
How do you split rent with a couple and a roommate?
A couple sharing one bedroom can count as one share or as two, and both are normal. One share treats rent as the price of a room, which fits when the couple has a single bedroom and the third person has their own. Two shares treat rent as the price of a person, which fits when the shared space is the bigger part of what you are paying for. In the calculator, tick Couple on the row the two of them share: the equal split then has a switch for one share or two, and the room size mode always gives the couple one bedroom while still counting two people in the shared space.
Worked example: a $1,800 rent, Ana and Ben share one bedroom, Chris has the other.
One share for the couple: their room pays $900.00, so $450.00 each, and Chris pays $900.00.
Two shares: all three pay $600.00.
By room size, with a 200 sq ft room for the couple, a 150 sq ft room for Chris and the slider at 100%: Ana $514.29, Ben $514.28, Chris $771.43. The odd cent goes to the first name on the couple's row, and the three amounts add up to exactly $1,800.00.