The short answer
Split rent equally if the bedrooms are similar and everyone earns about the same. Otherwise pick one of three fairer rules before anyone signs the lease:
- By room size: a bigger room pays a bigger share.
- By income: higher earners cover more of the rent.
- Equal plus a premium: split evenly, then add a fixed amount for the best room.
If you just want the numbers, the free rent split calculator does all of these, including couples sharing a room and a link you can send to your roommates. It runs in your browser and asks for no sign-up.
1. Split rent equally
Divide the rent by the number of people. $2,400 for three roommates is $800 each.
It is the simplest rule and needs no measuring or awkward conversations about money. It works well when the rooms are close in size and nobody has a private bathroom. It stops feeling fair when one person has a room twice the size of the others.
2. Split rent by room size
Give each bedroom a weight equal to its square footage. A person’s share of the rent is their room divided by the total of all the bedrooms.
Example: $2,400 rent, with rooms of 200, 150 and 100 sq ft (450 sq ft in total).
| Roommate | Room | Share of rent | Pays |
|---|---|---|---|
| Alex | 200 sq ft | 44.4% | $1,066.67 |
| Sam | 150 sq ft | 33.3% | $800.00 |
| Jo | 100 sq ft | 22.2% | $533.33 |
Room size is the easiest rule to defend, because anyone can measure a room. Most roommates count bedrooms only and treat the living room, kitchen and hallway as shared and free.
3. Split rent by income
Give each person a weight equal to their monthly income. Everyone pays the same percentage of what they earn.
Example: $2,400 rent, with incomes of $6,000, $3,000 and $3,000 a month. The shares are 50%, 25% and 25%.
| Roommate | Monthly income | Share of rent | Pays |
|---|---|---|---|
| Alex | $6,000 | 50% | $1,200.00 |
| Sam | $3,000 | 25% | $600.00 |
| Jo | $3,000 | 25% | $600.00 |
This is kinder when one roommate earns far less, but it means sharing pay details, so only use it if everyone is happy to do that.
4. Split equally, then add a premium for the best room
If measuring feels fussy, split equally and price the perks directly. A private bathroom, a walk-in closet or the only parking spot each get a fixed extra amount, and the rest of the rent is shared as usual.
Example: $2,400 rent split three ways. Alex’s room has a private bath, so Alex pays $150 more than the others, and the remaining $2,250 is split equally.
- Alex: $750 + $150 = $900
- Sam: $750
- Jo: $750
The three amounts still add up to $2,400. A discount works the same way: enter a negative number for a room with no door or a loud wall.
Which one should you pick?
Agree on the rule before the lease is signed, while nobody yet knows who will end up in which room. Choose the rule that matches the biggest difference between you:
- Rooms differ a lot: room size (the calculator can also count a private bath as extra room).
- Incomes differ a lot: income.
- One room has an obvious perk: equal plus a premium.
- Nothing differs much: equal.
Whichever you choose, round to whole cents and make sure the shares add up to the full rent. The calculator hands any leftover cent to one person so the total never comes up short.
Moving in or out mid-month
Use a daily rate. Take the person’s monthly share and divide it by the days in the month. If an $800 share starts on the 21st of a 30-day month, that is 10 days, so $800 × 10 ÷ 30 = $266.67 for that month.
When someone leaves, re-split the full rent among the people who remain from that date, and write down the new amounts so everyone has the same numbers.
A message you can paste into the group chat
Before we sign, can we agree how we split rent? Total is $2,400. I suggest we split by room size so the bigger room pays a bit more. Here are the numbers: Alex $1,066.67, Sam $800.00, Jo $533.33. Rent is due to me by the 1st, and I’ll pay the landlord. Does that work?
Putting it in writing early makes it a decision you made together, not a favor someone has to ask for later.
Who pays the landlord, and how to get paid back
Often only one person is on the lease or pays the landlord. That person is fronting money for everyone, so agree a due date, say the 1st, and a way to pay. When payment details are already saved, nobody has to ask “what’s your Venmo?” each month. Pre-filled payment info covers that.
Rent is the big number, but utilities, groceries and takeaways are what cause arguments. For shared receipts, split them item by item, and if a roommate doesn’t have the app, they can still see their share through a link.
Keep one running record
I built Splitceipt so a group can keep every shared cost in one place. Add your roommates to a group, log rent and bills as they happen, and the balances show who owes whom. It’s free, and you can check the rent split first with the calculator.