Short answer
Agree the rule before you sign: split rent equally, by bedroom size, or half equally and half by size. Split internet and other flat bills equally, metered utilities equally unless use is very uneven. On the 1st of each month, total the shared bills, compare with what each person paid, and settle with one transfer each.
Three fair ways to split rent
All three are fair when everyone agrees to them before the lease is signed. The example uses $2,400 of rent and three bedrooms of 180, 140 and 120 sq ft; swap in your own numbers.
| Method | How to calculate | Example: $2,400 rent | Suits |
|---|---|---|---|
| Equal | Rent ÷ number of people | $800 each | Rooms of similar size and comfort |
| By room size | Rent × your room’s sq ft ÷ all bedrooms’ sq ft | $981.82 / $763.64 / $654.55 | One room clearly bigger, or with its own bathroom |
| Half equal, half by room | Half the rent split equally for shared space, half by room size | $890.91 / $781.82 / $727.27 | A big shared kitchen and living room everyone uses |
Room-size shares: 180 ÷ 440 = 40.9%, 140 ÷ 440 = 31.8%, 120 ÷ 440 = 27.3%. Half-and-half: $400 each for shared space plus 40.9%, 31.8% and 27.3% of the other $1,200.
Splitting by income is a fourth option, more common for couples than for roommates; the arithmetic is in our guide for couples who keep separate finances. For what the rent itself should be relative to pay, see how much to spend on rent.
Utilities and shared supplies
- 01Fixed bills: split equally. Internet and any flat-rate service. Everyone uses them; equal shares end the discussion.
- 02Metered bills: equal unless use is lopsided. Electricity, heat and water usually split equally. Agree an exception up front if one person works from home all day or is away half the month.
- 03Shared supplies: one list. Cleaning products, toilet paper, dish soap. Write the list down; food stays personal unless you agree to cook together.
- 04Personal subscriptions: never shared. Your streaming, your phone, your takeaway. The line between shared and personal is where most arguments start, so draw it once.
Settle up once a month with one transfer each
Paying back each bill separately means a dozen small transfers a month and a running doubt about who still owes what. Net it instead.
- 1st of the monthTotal the shared billsEverything paid last month for the house
- ThenWork out each shareTotal × each person’s agreed share
- ThenCompare with what each paidPaid more = owed the difference
- DoneOne transfer eachEveryone back to zero for the new month
| Roommate | Paid last month | Equal share of $240 | Result |
|---|---|---|---|
| A | Internet $75 | $80 | Owes $5: pays B |
| B | Hydro $120 | $80 | Is owed $40 |
| C | Supplies $45 | $80 | Owes $35: pays B |
Two transfers close the month: A sends B $5, C sends B $35. The figures are an example.
Keep the shared bills in one place with Finman
A spreadsheet works until someone forgets to update it. The settle-up above needs one thing: a list of last month’s shared bills that everyone trusts. Finman can hold that list.
- 01One roommate creates a “House bills” account. Then creates a family in Finman and shares the invite code with the others.
- 02The others join with their own login. Each signs up with email or Google and enters the code.
- 03Give everyone view and add rights on the house account. Now anyone can log the bill they paid, and everyone sees the same list.
- 04Log each bill with the payer’s name in the description. For example “Internet, paid by A”. On the 1st, the month’s list is the settle-up table.
Accounts you do not share stay visible only to you. Your own spending, budgets and goals stay yours; roommates see only the house account. Recurring bills such as internet show up in Finman’s list of repeating charges with their next due dates. More on how access works in how shared finances work in Finman.
One house account everyone can see
Create a family, share the house bills account and let each roommate log what they paid. Free during the open beta, no card.
Set up the house accountWrite the edge cases down before they happen
- 01Someone moves out mid-month. Prorate by days: an $800 share for 10 days of a 30-day month is $800 × 10 ÷ 30 = $266.67.
- 02A partner stays over most nights. Agree a contribution to bills before it becomes the norm, and put the amount in writing.
- 03Something shared breaks. Split the repair by the bills rule, unless one person clearly caused it.
- 04The deposit. Record who paid what share of the deposit at signing, so the refund goes back the same way.
- 05A new roommate replaces an old one. Settle the leaving roommate to zero on their last day, then share the house account with the new one and remove the old one’s access.
Put the split rule, the shared-supplies list and these edge cases in one short note everyone has. It takes ten minutes and saves the arguments that start with “I thought we agreed”. If you are setting up your first budget on your own, start with a first budget in your 20s.
Frequently asked questions
How should roommates split bills fairly?
Agree a rule before signing: rent split equally, by room size or half equal and half by room size; fixed bills such as internet split equally; metered bills equal unless use is very uneven. Then settle once a month with one transfer per person.
How do you split rent by room size?
Multiply the rent by your bedroom’s square footage divided by the total square footage of all bedrooms. With $2,400 of rent and rooms of 180, 140 and 120 sq ft, the shares are $981.82, $763.64 and $654.55.
Is it fairer to split rent equally or by room size?
Equal works when rooms are similar. When one room is clearly bigger or has its own bathroom, splitting by room size, or half equally and half by room size, matches what each person gets.
How do roommates split utilities?
Most split internet and other flat-rate bills equally and split electricity, heat and water equally unless one person uses much more, for example by working from home all day. Agree any exception before the first bill.
What is the easiest way to settle shared bills each month?
On a fixed day, total last month’s shared bills, multiply by each person’s share, compare with what each person paid, and make one transfer each so everyone is back to zero.
Can roommates use Finman to track shared bills?
Yes. One roommate shares a house bills account through a Finman family and gives the others view and add rights, so everyone logs the bills they paid in one list. During the open beta every feature is free and no card is asked. After the beta, the Family plan is listed at $19 a month for up to 5 family members.
Make settle-up day boring
Share one house bills account, log who paid what and settle on the 1st. Free during the open beta, no card.
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