Split rent and bills between roommates by room size, shared space, income or equally. The shares always add up to the exact rent, and you can copy the result straight into your group chat.
| Name | Bedroom size | Monthly income | Extra % premium for private bathroom, parking and so on | Remove |
|---|
Extra % adds a premium for perks like a private bathroom, a balcony or a parking spot. 10% to 15% is common for a private bathroom.
| Person | Rent | Bills | Pays each month | Share of rent |
|---|
How to use the rent split calculator
- Enter the total rent and any bills you share, like internet, electricity or a cleaner.
- Choose how to split the rent. The table columns change to ask only for what that method needs.
- Add each person. Use the Extra % column for perks one person gets, such as a private bathroom or the only parking spot.
- Click Copy summary to paste the result into your group chat.
The amounts always add up to the exact rent. When the split doesn’t divide evenly, the leftover cent goes to whoever’s share was closest to rounding up.
Which split is fairest?
| Method | Best for | Watch out for |
|---|---|---|
| Equally | Rooms that are about the same | Feels unfair fast if one room is much bigger |
| By bedroom size | Shared houses where the common areas are small | Overcharges the big room for the kitchen and lounge everyone uses |
| Bedroom size + shared space | Most roommate situations | Needs the total size of the home |
| By income | Couples, or friends who earn very differently | Everyone has to be happy sharing their income |
Our pick for roommates is bedroom size plus shared space. Everyone uses the kitchen, living room and hallways equally, so that part is split evenly, and each person pays extra only for the private space they get. With the example above, the biggest room pays about 934 of the 2,400 rent instead of 1,061 under a pure size split, which most people find easier to agree on.
Measuring rooms
Measure each bedroom wall to wall and multiply length by width. Square feet or square metres both work, as long as everyone uses the same unit. Include a closet that only that room can use. Leave out bathrooms unless one is private, and handle that with Extra % instead.
For the total home size, check the lease or listing. If it isn’t listed, add up every room, including the kitchen, living room and hallways.
How the premium works
Extra % raises one person’s weight before the rent is split. A 10% premium on a private bathroom doesn’t add 10% to the total rent; it shifts a little of everyone else’s share onto that person. The total stays the same.
Agree on premiums before you sign the lease. It’s a much easier conversation when nobody has moved in yet.
Tips for splitting bills
Split utilities equally unless someone uses a lot more, like working from home with a space heater. In that case, switch bills to “Same way as rent” or agree a fixed extra amount.
Put the shared bills in one person’s name and have everyone pay them back on the same day each month. Rotating who pays gets messy within a few months.
Revisit the split when someone moves out or the rent goes up. The calculator remembers your setup in this browser, so it takes a minute.
Frequently asked questions
How do you split rent fairly with different room sizes?
Split the shared space equally and the bedrooms by size. Enter the total home size and each bedroom’s size, choose “Bedroom size + shared space”, and the calculator does the rest.
How do couples split rent by income?
Each person pays the same percentage of their income. If one partner earns 60% of the household income, they pay 60% of the rent. Choose “By income” and enter both monthly incomes.
Should a couple sharing a room pay more?
Usually yes. A common approach is to give the couple’s room an extra 30% to 50% to reflect two people using the kitchen, bathroom and utilities. Add it in the Extra % column.