Three ways to divide rent
An equal split gives everyone the same bill. A split by room size gives bigger rooms a bigger share, and some households adjust further for a private bath or a parking space. A split by income sets each share in proportion to what each person earns.
None of them is the correct answer. Equal is simplest. Room size ties the price to what you get. Income is gentler on lower earners. Some groups blend two methods, for example splitting by room and then rounding.
Worked example: $2,700 rent, three people
Equal: $900 each. By room size, with rooms of 180, 150 and 120 square feet, the shares are 40%, 33.33% and 26.67%, which is $1,080, $900 and $720. By income, with monthly incomes of $4,500, $3,600 and $2,400 (a total of $10,500), the shares are 42.86%, 34.29% and 22.86%, which is $1,157.14, $925.71 and $617.14.
Each method adds up to the full $2,700. Cents can be uneven, so agree in advance who rounds up. Try different splits in the rent split calculator and talk through the results together.
Utilities and groceries
Utilities are easiest if the bills stay in one name and everyone pays an equal share. With a $240 monthly total for three people, that is $80 each. If one person works from home or someone has a space heater running all winter, decide whether to adjust. A fixed monthly amount can be easier than recalculating each bill.
For groceries, many roommates keep food separate and share only staples such as cleaning supplies, paper goods and cooking basics. For shared items, keep receipts or use a shared note. Suppose in a month one person spends $180, another $60 and the third nothing. The total is $240, so each owes $80. The first is owed $100, the second owes $20 and the third owes $80.
Who fronts the bills and how to settle up
Someone usually has to pay the landlord or the utility company first. Rotate the job or let the person with the account handle it, and set a day each month when everyone sends their share. Use a payment method that leaves a record, and settle shared purchases at the same time so balances do not pile up. Late payments cause friction quickly, so agree on what happens if one person is short.
Put it in writing
Write the agreement down, even if it is a message that everyone replies to. Cover the rent split, utilities, shared supplies, guests, quiet hours, the due date and what happens if someone cannot pay. A written note is not a substitute for the lease, which sets your obligations to the landlord. Read the lease carefully, because names on it may be responsible for the whole rent.
When someone moves out
Start with the lease and the landlord's rules, because they decide whether a person can leave and whether a replacement needs approval. Then agree among yourselves how notice, the security deposit and the new split work. For example, the same rent shared between two people instead of three changes everyone's share, and the split should be recalculated. This is general information, not legal advice. If there is a dispute over a lease or deposit, local tenant resources or an attorney can help.
Try the calculator
Run your own numbers in the free rent split calculator. It works in your browser and nothing you enter is saved or sent.
Common questions
Should utilities be split the same way as rent?
Not necessarily. Many households split rent by room and utilities equally. Pick whichever the group considers fair.
What if a roommate stops paying?
Check your lease, since everyone named on it may be responsible. Talk early, and seek local tenant advice or legal help if it continues.
Do we need a written agreement?
It is not required, but writing it down avoids disagreements about what was said.
This guide is general information, not financial, tax or legal advice. Rates, fees and rules change, so confirm current terms with the lender, store or agency involved. All dollar figures are invented examples.