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Dividing the bills takes a second. The part worth reading is what happens when one person stops paying: on the lease most students sign, each tenant owes the whole rent, a landlord need not accept a partial payment, and everyone named can be evicted. Split the money below, then read what five university and state offices publish about that.
Last updated 1 October 2026
Not legal advice, and the split is arithmetic only. This page quotes university legal-services offices, a university housing office and a state attorney general's consumer guidance so you can check each one, but terms vary by lease and by state and none of it describes your lease. The calculation divides evenly by head and has no field for unequal rooms, move-in dates or who used what. Rounding means the per-person figures do not always sum to the total: six people splitting $100.00 are each shown $16.67, which adds to $100.02. Negative amounts are treated as zero and a roommate count of 0 is treated as 1. Follow your lease and your roommate agreement.
The division at the top of this page takes a second and is almost never the thing that goes wrong. What goes wrong is that four people each pay the number the calculator gave them, one of them stops, and the other three discover that the lease never agreed to the split in the first place.
The term for it is joint and several liability, and university legal-services offices describe it in blunter language than landlords do. The University of Kansas's Student Legal Services puts it this way: “Joint and several liability means that if you rent an apartment with other tenants, you are each responsible for the full amount of rent stated in the contract. This means that if one roommate fails to pay his or her share and the landlord only receives partial payment as a result, all roommates can be evicted.” It then adds the sentence students most need to read: “Unfair as this seems, this clause is enforceable.”
UCLA Student Legal Services gives the same rule with the consequence spelled out: “If you are a co-tenant, then you and your roommate are jointly and severally liable for your obligations under the rental agreement. This means that each of the co-tenants is responsible for the entire amount of the rent and, if your roommate does not pay, the landlord can require you to pay the full amount owed.”
So the figure the calculator prints is a housekeeping number: what each of you owes each other, by agreement. Your exposure to the landlord is a different and much larger number, and on a joint lease it is the whole rent.
UCLA's roommate guidance runs the exact scenario, and it is worth quoting at length because the answer is not the one most students expect. The question is a roommate who moves out mid-lease and says she will not pay. The answer:
“Because you and your roommate both signed the lease, you are jointly and severally liable for the rent. That means that each of you is responsible for the entire amount of rent for the apartment, so you will have to pay the landlord your roommate's share of the rent until you find a replacement roommate. You probably have a legal right to sue your roommate, however, for any money” owed.
Three separate things are in that paragraph, and they happen in this order. You pay. You keep paying until a replacement is found. Only then do you have a claim against the person who left, and it is a claim you have to pursue yourself. The landlord is not part of that last step and has no reason to help with it.
Marquette University's residence life office makes the same point about a mismatch nobody plans for, which is a roommate signing for less of the year than you do: “If you want to sign for the academic year, but your roommate only wants to sign for the fall semester, you would be responsible for the full apartment (including rental payments) for the spring semester.”
This is the part that makes the calculator genuinely dangerous if you stop at its output. Suppose the rent is $2,280 and you three have each transferred $760 to the landlord. One person's transfer fails. The landlord has received $1,520 of $2,280.
Virginia's Office of the Attorney General states the position in its landlord-tenant guidance: “The landlord is not obligated to accept partial payments.” The same page describes who is on the hook: “In most cases, roommates are considered ‘tenants in common.’ All parties named on the lease are responsible for the rent.”
Put those two sentences together and the result is counter-intuitive. A landlord can decline $1,520 toward a $2,280 obligation, treat the rent as unpaid in full, and proceed against every name on the lease, including the two people who paid on time and in full. KU's office describes that endpoint directly: “all roommates can be evicted.” It also notes a consequence that outlives the eviction: “Tenants are liable for rent for the full lease term even if he or she is evicted from the apartment.”
This is why KU's practical recommendation is a collection arrangement rather than parallel payments: “It may be a good idea to have one tenant responsible for paying rent and for all other roommates to pay their shares to that person.” One payment arrives, in full, on time. The shortfall becomes a dispute between housemates instead of a default against the lease. That is the single most useful structural change available to you, and it is the reason a tool like the one above exists: somebody has to work out what each person hands over.
Not every student lease works this way, and which kind you have changes the answer completely. Marquette describes the split: “Joint leases are the most prevalent type of lease, and are the lease that renters will most commonly see in off-campus properties. A joint lease is one in which all roommates in a particular apartment sign the same lease”, with the consequence that “any one tenant is responsible for the actions (or inactions) of all the others.” Against that, “An individual lease means that you alone are renting a space (or bedroom) within a larger apartment.”
The University of Colorado Boulder's off-campus housing guidance describes the same two and flags what individual liability does not protect: “The most common lease for college students is a joint and several liability lease, where you and your roommates all sign the same lease. This means you're responsible if a roommate misses rent or causes damage—even if you weren't involved.” And for the other kind: “In this case, you're only responsible for your own rent and any damage to your space, but you might also be responsible for damages in shared areas.”
So even on an individual lease the kitchen is still collective. The clean separation people imagine does not extend to common areas.
There is also a way to be a co-tenant without having signed anything, which matters to anyone who moved in later. UCLA's test: “Generally speaking, you are a co-tenant if your name is on the rental agreement. Even if you are not named in the rental agreement with the landlord, you probably are a co-tenant if you pay your rent directly to the landlord (and not to a roommate), if you have completed a credit application or application to rent for the landlord, or if your name is on the mailbox and the landlord has demonstrated a knowledge that you are a tenant.” Paying the landlord directly rather than paying a housemate is one of the facts that can make you one.
Every office cited on this page recommends a written agreement among the housemates, and none of them claims it changes the lease. Virginia's Attorney General: “Prior to signing any lease, it is always a good idea to have a written understanding among roommates stating individual responsibilities and expectations.” UCLA notes that in California “roommate agreements and sublease agreements can be either oral or written and both types are enforceable”, while adding that “it is far easier to prove the terms of a written agreement.”
What an agreement is good for is the thing the calculator above produces: an agreed basis for the split, written down before anyone is angry. UCLA's own checklist of what to put in one includes several items this tool cannot infer, and one of them is specifically a billing question: “In whose name the utilities will be and how the bills will be divided.” Its list also covers “What happens if a roommate wants to leave early: who pays the rent until a replacement is found; who finds the replacement; who may approve the replacement” and “How the rent is divided.”
The utilities point deserves its own sentence, because it is invisible in any equal split. Whoever's name is on the electricity account is the person that utility pursues, and that is a separate exposure from the lease with a separate consequence attached to it, namely that person's credit record. An equal division of a bill does not equalise who is answerable for it. Decide whose name goes on what, write it down, and rotate it if that seems fairer than one person carrying all of it.
One more from UCLA, for anyone planning to replace a departing housemate: “Most rental agreements contain a provision prohibiting subletting or assigning without the prior written approval of the landlord.” Finding a replacement is not the same as being allowed to install one.
This is the classic defect in any tool that divides money, and it is worth knowing what the page does about it. Six people splitting $100.00 cannot each pay the same amount. A sixth of $100.00 is $16.6666, and if the panel simply rounded that to $16.67 and printed one figure, six people would hand over $100.02. Three people splitting the same $100.00 would each be shown $33.33, which collects only $99.99.
So the panel splits in whole cents and names the odd ones. Six people and $100.00 gives $16.67 × 4, $16.66 × 2, which adds to exactly $100.00. Three people gives $33.34 × 1, $33.33 × 2. Where the division is exact, as it is for the shipped example of $2,280.00 three ways, you get a single figure of $760.00 and no remainder at all.
What the page cannot decide is who pays the extra cent. It tells you that one person pays $16.67 and another $16.66; it has no view on which of you is which. For a single month that is noise. For a household settling up every month for a year it is a drift somebody has to absorb, and the person collecting the money is the one who ends up looking wrong.
The fix there is not arithmetic, it is a decision, so make it once and write it into the roommate agreement: the collector always takes the odd cents, or the person who pays the extra rotates month by month. Either is fine. Leaving it undecided is what causes the argument.
Your lease. It has no idea whether you are on a joint or an individual lease, and that single fact determines whether the number it prints bears any relation to what you can be made to pay.
That shares should be unequal. It divides everything by the number of people, full stop. Different room sizes, a private bathroom, a partner staying four nights a week, a housemate who arrived in October, a parking space used by one car: none of those can be entered, and all of them are the usual reasons a split is disputed.
Who used what. Groceries and utilities are divided per head like the rent. There is no per-person consumption, no itemisation and no record of who paid for what, so it cannot settle up a month in which people paid unevenly. It computes a share; it does not compute a balance.
Negative numbers. Entering a credit or a refund as a negative amount does not subtract it. Any negative input is silently treated as zero, so a $50 refund entered as −50 simply vanishes from the total with no warning.
Zero people. Setting the roommate count to 0 does not produce an error; the calculation quietly proceeds with one person, and the output line reads “Roommates 1” while the input box still shows 0. The figure is right for one person and is not what you asked for.
Its own stated maximum. The input is marked as allowing up to 12 roommates, but typing a larger number is accepted and used. There is no upper limit in the calculation.
Anything, after you close the tab. Nothing is saved, nothing is sent and there is no export or payment request. It is a divider, not a ledger.
For the month-by-month side of this, the college budget planner is where your share meets your income. If you are still choosing a place, read your lease for the words “joint and several” before you read anything else in it.
This page is not legal advice and nobody here is your lawyer. It reports what named university legal-services offices, a university housing office and a state attorney general's consumer-protection guidance have published, read on 1 October 2026, and quotes them so you can check each one. Lease terms and tenant law both vary by lease and by state, the sources above describe conditions in Kansas, California, Virginia, Wisconsin and Colorado respectively, and none of them can tell you what your own lease says. Read your lease, and if money or an eviction is genuinely at stake take it to your campus student legal services office, which is usually free. The division above is arithmetic only, and as set out on this page the per-person figures do not always sum to the total. Nothing you type leaves your browser. More: the rest of the MyCampusKit tools.
On a joint and several liability lease, yes. UCLA Student Legal Services states that "each of the co-tenants is responsible for the entire amount of the rent and, if your roommate does not pay, the landlord can require you to pay the full amount owed", and that you will have to pay the landlord their share "until you find a replacement roommate". You may then have a right to sue the person who left, but that is a separate matter you pursue yourself. This is not legal advice and your lease and state govern the answer.
That each tenant individually owes the whole rent, not a share of it. The University of Kansas Student Legal Services puts it as: "if you rent an apartment with other tenants, you are each responsible for the full amount of rent stated in the contract. This means that if one roommate fails to pay his or her share and the landlord only receives partial payment as a result, all roommates can be evicted." The same page adds: "Unfair as this seems, this clause is enforceable."
Yes, and this is the part most students do not expect. Virginia's Office of the Attorney General states that "The landlord is not obligated to accept partial payments." So if three of four shares arrive, the landlord can treat the rent as unpaid in full and act against every name on the lease, including the people who paid on time. Paying your computed share protects you with your housemates, not with your landlord.
KU's Student Legal Services recommends a collection arrangement rather than parallel payments: "It may be a good idea to have one tenant responsible for paying rent and for all other roommates to pay their shares to that person." One full payment arrives on time, and a shortfall becomes a dispute between housemates instead of a default on the lease. That is what a splitter like this is for: working out what each person hands to the collector.
Mostly, but not in the shared rooms. CU Boulder's off-campus guidance says that on an individual liability lease "you're only responsible for your own rent and any damage to your space, but you might also be responsible for damages in shared areas." Marquette adds that individual leases are the less common arrangement and that joint leases "are the lease that renters will most commonly see in off-campus properties."
No. Every office cited on this page recommends a written agreement among housemates, and none claims it changes your obligations to the landlord. It governs what you owe each other. UCLA notes that in California such agreements can be oral or written and both are enforceable, while "it is far easier to prove the terms of a written agreement." Put the split, the remainder rule and the utility account names in it.
Because money does not always divide evenly, and one rounded figure would not add back to the total. A sixth of $100.00 is $16.6666: printing $16.67 six times collects $100.02, and printing $16.66 six times collects $99.96. So the panel splits in whole cents and names the odd ones, giving $16.67 for four people and $16.66 for two, which adds to exactly $100.00. Seven people splitting $1,800.00 get $257.15 for two and $257.14 for five. Where the division is exact you see a single figure. What the page cannot decide is which of you pays the extra cent, so settle that once between yourselves.
Because they happen to divide exactly. The default figures of $1,800 rent, $180 utilities, $60 internet and $240 groceries total $2,280, which divides into exactly $760 across three people. Change any one of them and the rounding gap appears. Decide once who takes the remainder, by rounding up and letting the collector keep the overage, rounding down and letting them absorb it, or rotating it monthly.
No. It divides every total by the number of people and nothing else. There is no field for room size, a private bathroom, a partner staying several nights a week, a housemate who moved in mid-term, or who actually used the groceries. Those are the usual reasons a split is disputed, so settle them in a written roommate agreement and use this only for the even-split arithmetic.
Neither is rejected, and both are handled silently. A roommate count of 0 is treated as 1, so the result is one person's figure while the input box still reads 0. A negative amount, say a $50 refund entered as -50, is treated as zero and simply disappears from the total. The count is also marked as allowing up to 12 people but accepts and uses larger numbers.