How to split rent fairly with roommates
Five methods, when to use each, and a worked example you can copy for your own flat.
Splitting rent equally is easy, but it's only fair when every room is about the same. When one bedroom is twice the size of another, or has its own bathroom, an equal split means someone is subsidising someone else every single month. Over a year-long lease, that adds up.
The good news: there are a handful of simple, well-tested ways to divide rent. Pick one together before you sign the lease.
5 ways to split rent
1. Split it equally
Best when rooms are roughly the same.
Divide the rent by the number of people. It's the simplest method and needs no negotiation, but it quietly overcharges whoever has the smallest room.
2. Split by room size
Best when bedrooms differ a lot in size.
Charge each person in proportion to their bedroom's floor area. Measure each room, add the areas up, and each person pays their room's share of the total rent.
3. Hybrid: private space plus shared space
Best for most flatshares. Our recommendation.
Split the rent into two parts: the share that pays for common areas (kitchen, living room, bathrooms) is divided equally, and the share for bedrooms is divided by room size. This is fairer than pure room size, because everyone uses the shared spaces equally.
4. Adjust for features
Best when one room has an en-suite, balcony or parking.
Start from any method above, then agree a fixed premium for extras, for example 5% more for an en-suite. Take the premium off everyone else's share in equal parts.
5. Split by income
Best for couples or households that pool money.
Each person pays rent in proportion to what they earn. Common for couples, less so for housemates, where it can feel intrusive.
Worked example: the hybrid method
Three roommates share a flat for 3,000 a month. The bedrooms are 16 m², 12 m² and 12 m², for 40 m² of bedroom space in total.
They agree that 40% of the rent (1,200) pays for shared spaces and 60% (1,800) pays for bedrooms.
| Room | Shared share | Bedroom share | Pays |
|---|---|---|---|
| Large (16 m²) | 400 | 720 (16/40) | 1,120 (37.3%) |
| Medium (12 m²) | 400 | 540 (12/40) | 940 (31.3%) |
| Medium (12 m²) | 400 | 540 (12/40) | 940 (31.3%) |
Compared with an equal split of 1,000 each, the person in the big room pays 120 more and the other two pay 60 less each. Once you have the percentages, enter rent with a percentage split and they apply every month.
What about bills and utilities?
Utilities, internet and streaming subscriptions are normally split equally, because everyone uses them regardless of room size. Groceries are best split item by item, or equally for shared staples. Our roommate bill splitting guide covers the day-to-day side, and the bill split calculator handles quick one-off splits.
Frequently asked questions
What is the fairest way to split rent?
For most flatshares, a hybrid split is fairest: divide the cost of shared spaces equally and divide the cost of bedrooms by room size. Then add an agreed premium for extras like an en-suite.
How do you calculate rent by square footage?
Add up all bedroom areas. Each person's share of the bedroom portion of the rent is their room's area divided by the total bedroom area. If you use the hybrid method, add an equal share of the common-area portion.
Should a couple sharing a room pay more?
Usually yes. A common approach is to treat the couple as two people for the shared-space portion of rent and as one room for the bedroom portion, since they use the kitchen, bathroom and utilities like two people.
How do we keep track of rent and bills each month?
Put everyone in one Cost Share group and add rent with a percentage split that matches your agreement. With Premium, rent can be added automatically every month as a recurring expense.
Track rent and bills in one place
Cost Share keeps a running balance for your whole flat, with percentage splits for rent and itemized splits for groceries. Free, no ads.