Sharing a place is the fastest way to cut your housing cost — and money is the fastest way to wreck a household. Most roommate blowups aren't about the dollars; they're about a fuzzy, unspoken arrangement nobody actually agreed to. A clear split, written down once, retires the awkward "you owe me" conversations for good.
This tool takes your roommates and your list of shared bills and tells each person exactly what they owe.
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Roommates (comma-separated)
Type everyone's names separated by commas — the tool counts them and divides the shared total equally. Equal-per-person is the cleanest default and the easiest to keep agreeing to month after month, which is why it tends to outlast more elaborate schemes. Decide upfront who counts as a sharer: a partner who stays four nights a week, a returning subletter over the summer, a roommate who travels constantly for work. Ambiguity about who splits causes as many arguments as ambiguity about what.
Expenses (one per line: item, amount)
Enter each shared bill on its own line as "item, amount" — for example Rent, 2100 or Electric, 140. The tool sums them and divides by the number of roommates. The line that separates a smooth household from a tense one is the boundary between shared and personal: shared costs are the ones everyone benefits from roughly equally, while anything one person controls or consumes alone stays off this list. A reserved parking spot, a private streaming login, a gym membership, individual groceries — keep those out and settle them one-to-one.
- Rent and any parking or amenity fee charged to the unit as a whole.
- Electricity, gas, water, sewer, and trash — the utilities the household runs together.
- Internet, and a shared streaming account everyone genuinely uses.
- Household staples like cleaning supplies, paper goods, dish soap, and trash bags.
- Recurring shared services such as pest control or a cleaner, if the house splits them.
Handling unequal splits
This calculator splits evenly, which fits utilities and household supplies cleanly. But rent is often the fair exception — the person in the big room with the private bath shouldn't pay the same as the one in the box with no window. The common approach is to assign rent by room: agree on each person's percentage of total rent (by square footage, closet space, bathroom access, or simple negotiation), settle those rent shares separately, then use this tool to split the utilities and shared supplies that everyone uses equally. That keeps the lopsided item out of the even split without forcing the whole household onto a complicated formula.
How to use this calculator
Enter the roommates' names, then the list of shared expenses one per line, and click Split expenses. The result shows total shared spending, the number of roommates, and the equal amount each person owes, with a per-person breakdown. Re-run it whenever the bills or the roster change. Everything is calculated in your browser; nothing you type is uploaded or stored.
Frequently asked questions
Which expenses should roommates actually split?
The reliable shared list is rent, electricity, gas, water and sewer, trash, and internet. Many households add a jointly used streaming account and common cleaning supplies. Personal food, individual subscriptions, and anything only one person uses stay separate. The single best move is agreeing on this list before move-in, so no one is surprised by a charge they didn't expect to share.
How do we split rent when the rooms aren't equal?
Set each person's rent share by agreement — square footage, private bathroom, natural light, and closet space are the usual factors — and express it as a percentage of total rent. Settle those rent amounts on their own, then run the utilities and shared supplies through this tool's even split. Combining a negotiated rent split with an equal utilities split is the most common fair arrangement.
What's the cleanest way to collect the money?
Designate one person to pay each shared bill in full, then have everyone reimburse that person — it keeps the number of transfers small and creates a clear record. Peer-to-peer payment apps make the reimbursements traceable. Agree on a payment date a few days ahead of when bills are actually due, so one slow payer never triggers a late fee the whole house eats.
What happens when someone moves out mid-month?
Prorate their share for the days they were responsible — usually the daily rate (their monthly share divided by the days in the month) times the days they occupied or held the lease. Spell out in advance how a security deposit gets returned and how the final partial month is handled, because the move-out month is when most roommate money disputes actually erupt.
Important
This tool provides estimates and general-purpose documents, not financial, tax, legal, or professional advice. Verify important results before relying on them.
Support
Problem with this tool or suggestions for improvement? Please email support@niftyutilities.com.