Splitting rent evenly is the obvious answer and it's fine — right up until someone gets the room with no window, or a couple moves into the master bedroom and pays the same as the person in the box room.
The awkward part is that nobody wants to be the one to raise it. So here are four methods that are defensible, a formula you can run in five minutes, and answers to the situations that cause the most friction.
Method 1: Split evenly
Everyone pays the same, regardless of room.
Use it when the bedrooms are genuinely comparable, or when the group would rather keep things simple than optimise for fairness.
Don't use it when one room is dramatically better. Resentment over a rent split compounds monthly for the length of a lease, and it rarely gets renegotiated once it's set.
Method 2: Split by square metres
Measure each bedroom, add them up, and divide rent in proportion to the share each person occupies.
Worked example. Rent is £1,800. Three bedrooms measure 18 m², 14 m² and 10 m² — 42 m² total.
| Room | Size | Share | Rent |
|---|---|---|---|
| A | 18 m² | 42.9% | £771 |
| B | 14 m² | 33.3% | £600 |
| C | 10 m² | 23.8% | £429 |
It's objective and hard to argue with, which is its main appeal. Its weakness is that floor area isn't the only thing people value — a small room with an en-suite can be worth more than a large room facing a main road.
Adjusting for features. Add a fixed premium before doing the proportional maths. En-suite: £60–100/month. Private balcony: £30–50. No window or a windowless internal room: subtract £50–80. Take the premium off the top, split the remainder by area, then add each person's premium back.
Method 3: Split by room value (the sealed-bid method)
Instead of measuring, let people price the rooms themselves. This is the method economists like, and it's genuinely good when rooms differ in ways a tape measure can't capture.
- Each person privately writes down what they'd pay for each room, with their numbers adding up to the total rent.
- Reveal all bids at once.
- Assign each room to whoever bid highest on it.
- Usually the winning bids total more than the rent. Split that surplus equally and take it off each person's price.
Worked example. Rent is $2,100, three rooms.
| Room A | Room B | Room C | |
|---|---|---|---|
| Alex | $900 | $700 | $500 |
| Sam | $800 | $750 | $550 |
| Jordan | $750 | $700 | $650 |
Alex takes A at $900, Sam takes B at $750, Jordan takes C at $650. That totals $2,300 — $200 more than the rent. Divide the $200 surplus three ways ($66.67 each):
- Alex pays $833.33
- Sam pays $683.33
- Jordan pays $583.33
Everyone got the room they valued most, at less than they were willing to pay. This method also settles who gets which room, which is often the real argument.
Method 4: Split by income
Each person pays the same proportion of their income rather than the same amount.
If the household earns $3,000 + $4,500 + $2,500 = $10,000 combined and rent is $2,400 (24% of the total), everyone pays 24% of what they earn: $720, $1,080 and $600.
Use it when the household is a couple with different earnings, or close friends who've explicitly agreed to it. Be careful using it with acquaintances — it requires disclosing salaries, and it can shift when someone changes job, which means renegotiating.
The situations that actually cause arguments
A couple shares one room
Two people in one bedroom use more of the kitchen, bathroom and living room than one person does — but they don't use twice as much of the bedroom, which they're already paying for.
The common landing spot: the couple pays 1.5× the single-room rate, not 2×. Or split rent by room and shared bills per person, which handles it automatically and is easier to justify.
Someone moves in mid-lease
Prorate from the actual move-in day. Take the monthly rent, divide by the number of days in the month, multiply by days occupied.
$1,500 rent in a 30-day month is $50/day. Someone moving in on the 12th occupies 19 days: $950 for their share of that first month, then the normal rate afterwards.
Someone's away for a month
The default is that they still pay — they're keeping the room and their possessions are in it. If they're subletting with everyone's agreement, the subletter pays their share and the original tenant covers any gap.
Write this down before it happens. It's a much easier conversation in month one than in month seven.
The bills, not the rent
Rent is the easy part because it's fixed. Utilities are where households quietly go wrong: the bill lands in one person's name, they pay it, and three weeks later they're chasing four people for £23 each.
Two things fix this permanently:
- Rotate whose name is on what. One person shouldn't carry every bill and every chase-up.
- Set them up as recurring expenses in a shared app, so rent, council tax, internet and utilities get logged and split automatically on the same day each month, without anyone having to remember.
Putting it into practice
Pick a method, get everyone to agree explicitly, then write it down — in a group chat message if nothing else. A five-line note beats a perfect verbal agreement nobody can recall in March.
Then take it out of your head. Splitano handles the recurring side: set rent and each utility once, choose how they split, and they're added automatically every month and divided among whoever's currently living there. When someone moves out, you adjust the group rather than redoing the maths.
A rent split that everyone understood on day one almost never becomes an argument on day two hundred. The ones that do are always the ones nobody wrote down.
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