About the Rent Split Calculator
Sharing a home is one of the most common ways to make rent affordable, but deciding who pays what can strain even good friendships. Splitting the rent equally is simple, and fair when the bedrooms are similar. But when one room is twice the size of another, has its own bathroom, or one housemate earns much more than the others, an equal split can quickly feel unfair to someone.
This rent split calculator shares the rent between two, three or four people using the three most common methods: an equal split, a split by bedroom size in which part of the rent covering shared space is divided equally, and a split in proportion to income. It gives each person's share in money and as a percentage, and makes sure the shares add up to exactly the rent.
How to Use the Rent Split Calculator
Enter the total rent and the number of people.
Choose the method.
For the room size method, enter each person's bedroom size — square feet or square metres, as long as everyone uses the same — and the share for shared space.
For the income method, enter each person's income, all monthly or all yearly.
How the Rent Is Split
equal each = rent ÷ people
room size shared = rent × shared % ÷ people (each)
bedroom = rent × (1 − shared %) × room ÷ all rooms
each = shared + bedroom
income each = rent × income ÷ total incomeShares are rounded to the cent, and the last person absorbs any leftover cent so the total is exact.
Step-by-Step Example
Rent of 2,400 between three people, with bedrooms of 150, 120 and 100 square feet and half the rent for shared space.
Shared: 2,400 × 50% ÷ 3 = 400.00 each
Bedrooms: 1,200 split by 150 : 120 : 100 (370 in total)
Person 1: 400 + 1,200 × 150 ÷ 370 = 886.49
Person 2: 400 + 1,200 × 120 ÷ 370 = 789.19
Person 3: 400 + 1,200 × 100 ÷ 370 = 724.32The same rent by income: 5,000, 4,000 and 3,000.
Person 1: 2,400 × 5,000 ÷ 12,000 = 1,000.00
Person 2: 2,400 × 4,000 ÷ 12,000 = 800.00
Person 3: 2,400 × 3,000 ÷ 12,000 = 600.00Choosing a Method
Equal is best when the rooms are similar in size and quality and everyone has similar means. It is simple and nobody feels they have to justify anything.
By room size is the usual choice when bedrooms differ. Splitting a portion equally reflects that everyone uses the kitchen, living room, bathroom and hallway, which are a big part of what the rent pays for. Somewhere between 40 and 60 percent is common for the shared portion. Splitting purely by bedroom size, with no shared portion, charges the person in the largest room far more than their extra space is really worth.
By income is common for couples and for close friends or family with very different earnings. It keeps the rent the same share of everyone's income, so housing costs weigh equally on each person.
Adjusting for Features
Floor area is only one difference between rooms. An en-suite bathroom, a balcony, a built-in wardrobe, a parking space, better light or a quieter position all make a room more valuable. A room shared by a couple uses the shared space more too. Many households agree a small premium — say 50 to 100 a month — for such features, and deduct it evenly from everyone else. You can reflect this by adjusting the room sizes or by agreeing the premium separately.
Utilities and Shared Costs
Bills for electricity, gas, water, internet and shared household supplies are usually split equally, because use is hard to measure and differences are small. Some households split them in the same proportion as the rent. A shared spending app or a joint account for bills makes it easy to keep track. Whatever method you choose, write it down, along with who is responsible for paying the landlord and the bills.
Deposits and Leases
If everyone is on a joint lease, each person is often responsible for the whole rent if others do not pay. Knowing the agreed split, and each person's share of the deposit, avoids disputes when someone moves out. When a housemate leaves, revisit the split: a new person may take a different room, or the method may no longer suit the household.
Measuring Bedrooms
For the room size method, measure each bedroom's length and width in the same unit and multiply them. Measure wall to wall at floor level, and include built-in wardrobes if they belong to the room. Awkward shapes can be split into rectangles and added together. Precision to a square foot or a tenth of a square metre is plenty; the aim is a fair ratio, not an architect's drawing.
A Worked Example With a Premium
Suppose three housemates agree that the room with an en-suite bathroom is worth an extra 60 a month. Work out the room-size split first, then add 60 to that person's share and take 30 off each of the other two. In the example above, the shares would become 946.49, 759.19 and 694.32, still adding up to 2,400.
Understanding Your Result
Each person pays lists every person's share of the rent.
Share of the rent shows each share as a percentage.
Method summarises how the rent was split.
Check confirms the shares add up to the full rent.
Worth knowing suggests agreeing the method before moving in.
When Should You Use This Calculator?
Moving into a shared house or flat.
Settling a disagreement about who pays what.
Moving in with a partner.
Replacing a housemate who is leaving.
Comparing methods to see which feels fairest.
Common Mistakes
Splitting purely by bedroom size.
Ignoring en-suites and other features.
Mixing monthly and yearly incomes.
Mixing square feet and square metres.
Not writing the agreement down.