Split rent with roommates without the monthly argument.
Rent, utilities, wifi, groceries: Splitwiser keeps every shared cost in one place and tells everyone exactly what they owe, every month, automatically.
Most roommates split rent one of three ways: evenly, by room size, or by income. The fairest choice depends on how similar the bedrooms and everyone's earnings are. Whichever method you pick, agree on it before move-in, and put it in writing.
Need the exact numbers, not just the method? The rent split calculator works out each roommate's share instantly, evenly, by income, or by room size.
Recurring rent, done once
Set up rent and utilities as a recurring expense and Splitwiser re-splits it automatically every month.
Equal or by room size
Not all rooms are equal. Split evenly, or weight it by room size so the split matches what's fair.
One clear balance
Every roommate sees exactly who owes what, no more digging through group chat receipts.
Gentle reminders
Splitwiser nudges whoever's behind so you don't have to be the one chasing rent money.
"Rent, wifi, groceries: everything is finally in one place and nobody argues about it anymore."
How to agree on a fair rent split before you move in
The best time to decide how rent gets split is before anyone signs a lease, not after the first awkward month. Walk the bedrooms together and be honest about size and features: a room with its own bathroom or more closet space is worth more, even if nobody wants to say so out loud. Pick a method, equal, by room size, or by income, and write down the actual numbers everyone agreed to, not just the method. A short note in the group chat is enough; the point is having something to point back to later.
Revisit the split whenever the household changes: someone moves out, a couple moves into one room, or a room gets renegotiated after a bad winter with no heating. Treat it as a living agreement, not a one-time decision.
What to do when a roommate is late or refuses to pay
Address it the same month it happens. Covering a late roommate "just this once" is how a one-off becomes a pattern, since there is rarely a consequence for repeating it. Point back to the agreed split, ask directly when they will catch up, and put a date on it rather than leaving it open-ended.
If it keeps happening, get specific in writing: the amount owed, the date it was due, and what happens if it is not paid before the next month's rent. A visible, up-to-date balance also helps here, since "I didn't realize I was behind" stops being a credible excuse when the number has been sitting there the whole time.
A worked example: three roommates, different room sizes
Three roommates share a flat with $2,400 monthly rent. Alex has the largest bedroom at 160 square feet with an ensuite, Jordan's room is 130 square feet, and Sam's is 110 square feet, for 400 square feet of total bedroom space. Splitting by square footage: Alex pays 40 percent ($960), Jordan pays 32.5 percent ($780), and Sam pays 27.5 percent ($660). Alex's group adds a flat $100 premium for the ensuite, taken evenly off the other two shares, landing on $1,060 / $730 / $610. Everyone agreed to the adjustment in advance, which is the part that actually prevents the argument, not the exact formula used.
Common questions
How does splitting rent with roommates work?
Add your monthly rent and utilities as recurring expenses, split evenly, by income, or by room size, and Splitwiser tracks each roommate's balance automatically every month.
What is an expense splitter app?
An expense splitter app tracks shared costs, like rent, trips, or dinners, and automatically calculates who owes who, so a group does not have to do the math by hand.
How much rent should I pay if my room is smaller?
A common approach is to pay a share proportional to your room's square footage: measure each bedroom, divide yours by the total, and apply that percentage to the rent. The rent split calculator does this automatically.
What if a roommate refuses to pay their share?
Address it immediately rather than covering for them: a small gap left unpaid tends to become a habit. Point to the agreed split and ask them to catch up before the next month's rent is due, in writing if a conversation does not work.
Should new roommates split rent equally or by room size?
Equally if the bedrooms and everyone's income are similar. By room size if one bedroom is noticeably bigger or has its own bathroom. Decide before signing the lease, not after someone has already moved in.
How do you handle rent when a roommate moves out mid-lease?
The departing roommate pays a prorated share for the days they were there, then the remaining rent gets split among whoever is staying, or shared temporarily until a replacement moves in. The prorated rent calculator works out the partial-month amount.
Do utilities count toward the rent split, or get split separately?
Either works, but pick one method and stick to it. Many households split utilities the same way as rent for simplicity; others split them equally regardless of room size, since usage does not usually track with bedroom square footage.