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How to split rent and bills with roommates fairly
Three fair ways to split rent with roommates: equally, by room size, or by income, with worked numbers for each, plus how to handle bills.
The fairest way to split rent is the one everyone agrees to before the lease is signed. In practice that is one of three methods: split it equally, split it by the size of each bedroom, or split it in proportion to income. Below are worked numbers for each, a mixed method many households end up with, and how to handle bills.
Every example uses the same apartment: $2,400 a month in rent and three roommates, Ana, Ben and Cy.
1. Split it equally
$2,400 divided by 3 is $800 each.
This is the simplest method and the most common. It is fair when the rooms are about the same, everyone uses the place about the same, and incomes are close. It stops feeling fair when one person has the big room with its own bathroom and pays the same as the person in the box room.
2. Split it by room size
Measure each bedroom. Say Ana's is 160 square feet, Ben's is 130 and Cy's is 110. That is 400 square feet of bedrooms in total. Each person pays their room's share of that total.
| Roommate | Room | Share of bedrooms | Rent |
|---|---|---|---|
| Ana | 160 sq ft | 40% | $960 |
| Ben | 130 sq ft | 32.5% | $780 |
| Cy | 110 sq ft | 27.5% | $660 |
| Total | 400 sq ft | 100% | $2,400 |
The math for Ana: $2,400 × 160 ÷ 400 = $960. The same for the others.
A pure room-size split can overshoot, because everyone shares the kitchen, living room and bathroom equally. That leads to the mixed method.
3. Mixed: shared space equally, bedrooms by size
Decide what part of the rent pays for shared space. Half is a common choice. Split that part equally, and the other part by room size.
- Shared half: $1,200 ÷ 3 = $400 each.
- Bedroom half: $1,200 by room size = Ana $480, Ben $390, Cy $330.
| Roommate | Shared | Bedroom | Rent |
|---|---|---|---|
| Ana | $400 | $480 | $880 |
| Ben | $400 | $390 | $790 |
| Cy | $400 | $330 | $730 |
| Total | $1,200 | $1,200 | $2,400 |
The gap between the biggest and smallest room is now $150 a month instead of $300. If your place has a private bathroom, a balcony or the only parking spot, agree on a small extra for whoever gets it. Talk the numbers through, then write them down.
4. Split it by income
Each person pays in proportion to what they earn. Say Ana earns $6,000 a month, Ben $4,000 and Cy $2,000, for $12,000 in total.
| Roommate | Monthly income | Share | Rent |
|---|---|---|---|
| Ana | $6,000 | 50% | $1,200 |
| Ben | $4,000 | 33.3% | $800 |
| Cy | $2,000 | 16.7% | $400 |
| Total | $12,000 | 100% | $2,400 |
Each person pays 20% of their income. This works well for couples and for close friends who want rent to weigh the same on everyone. It works less well between roommates who found each other online: income is private, it changes, and the person paying $1,200 for a similar room may come to resent it. Use it only if everyone is genuinely happy with it.
Bills and shared costs
Rent is the big number, but bills cause more arguments. Some simple rules:
- Internet and streaming: split equally. Everyone uses them.
- Electricity, gas and water: split equally unless use is clearly uneven, such as one person working from home all day with a space heater. Then agree on a bigger share for them, and say why.
- Groceries: either everyone buys their own, or you keep a short list of shared staples (oil, soap, toilet paper) and split those equally.
- The deposit: record who paid what at the start, so it is easy to return the right amounts when someone moves out.
Keep track in Split
Split is a free way to keep all of this in one place, with no account and no daily cap on expenses.
- Make a group called "Apartment" with Ana, Ben and Cy, and share the link.
- Each month, whoever pays the landlord adds the rent as an expense they paid.
- For an equal split, leave the split as it is.
- For room size, split by shares and enter each room's size as the share: 160, 130 and 110. Split works out $960, $780 and $660.
- For income, use shares of 3, 2 and 1.
- For the mixed method, use exact amounts: $880, $790 and $730.
- Add bills as they are paid, by whoever paid them.
- At the end of the month, Split shows the fewest payments that settle everything. Pay each other, then record the payments.
Split does not have recurring expenses, so rent is added each month. It takes a few seconds, or you can ask your AI assistant to add it through Split's API.
Moving off Splitwise because of its daily limit? See the Splitwise limit and a free alternative.
Put it in writing
Whatever you choose, write it down: the method, each person's share, how bills work, and what happens when someone moves out. A short roommate agreement saves a lot of awkward conversations. If you want everyone to sign it, Sign turns the text into a PDF and collects each person's signature, free.
Questions
What is the fairest way to split rent with roommates?
The fairest way is the one everyone agrees to up front. Splitting equally suits rooms of similar size. Splitting by room size suits uneven bedrooms. A mixed method, with shared space split equally and bedrooms split by size, is a common middle ground.
How do you split rent by room size?
Add up the size of all the bedrooms, then each person pays their room's share of that total. With rent of $2,400 and bedrooms of 160, 130 and 110 square feet, the shares are 40%, 32.5% and 27.5%, so the rents are $960, $780 and $660.
Should roommates split rent by income?
Only if everyone is happy with it. Splitting by income means each person pays the same percentage of what they earn, which suits couples and close friends. Between roommates who do not know each other well, it can cause resentment, and income is private.
How should roommates split utilities?
Most households split internet and utilities equally. If use is clearly uneven, for example one person works from home all day, agree on a larger share for that person and write it down.
Is there a free app to split rent with roommates?
Yes. OpenApps Split is free with no limit on expenses. Make a group, share the link, and add rent and bills as they are paid. Split equally, by shares or by exact amounts, and Split shows the fewest payments that settle up.