Rent Split Calculator
Split rent fairly between roommates using even, income-based, room-size, or days-occupied methods. See each person's share with exact rounding and a shareable link.
A rent split calculator turns the awkward roommate conversation about money into a clear, shareable number. You enter the total monthly rent, list everyone who lives in the unit, choose a split method, and the calculator tells each person exactly what they owe. Because the inputs are saved in the page URL, you can copy the link into a group chat and everyone sees the same breakdown.
Sharing a home is one of the most common ways people manage housing costs, but rent is rarely the only shared expense. Once you have agreed on how to divide rent, the same approach usually carries over to utilities, internet, the security deposit, and household supplies. Settling the method early — ideally before anyone signs the lease — prevents the slow-burning resentment that builds when one person quietly feels they are overpaying.
This tool supports four split methods so you can match the math to your living situation: an even split, an income-based split, a room-size split, and a days-occupied split. You can switch between them instantly to compare what each person would pay under different assumptions, which is often the fastest way to reach an agreement everyone considers fair.
Each method answers a different question about fairness. There is no universally correct choice — the right one depends on your bedrooms, your incomes, and what your household values.
Every roommate pays the same amount. Simple and transparent, it works best when bedrooms are roughly equal in size and the household prefers not to factor in income.
Each person pays the same percentage of their take-home pay. A higher earner contributes more in dollars, easing the burden on lower earners while keeping the relative sacrifice equal.
Shares are proportional to the square footage each person occupies. The master bedroom with a private bath pays more than a small interior room. Enter relative sizes — any consistent unit works.
Useful for mid-month move-ins, a roommate who travels for work, or a sublet. Enter the nights each person actually lives in the unit and rent is divided in proportion to that time.
Every method is a weighted division. Give each roommate a weight, then their share is:
Raw division almost never lands on whole cents. If you simply rounded each share on its own, the totals could come up a cent short or a cent over the real rent — and landlords expect the exact figure. This calculator rounds every share down to the nearest cent, then hands out the leftover cents one at a time to the people with the largest fractional remainders. This largest remainder method guarantees the individual shares always add up to the precise total, so no money is lost or invented.
Imagine three roommates sharing an apartment that rents for $2,400 per month.
$2,400 ÷ 3 = $800.00 each. Because $2,400 divides cleanly, no rounding adjustment is needed.
Incomes of $6,000, $4,000, and $2,000 total $12,000. The shares are 50%, 33.3%, and 16.7% — roughly $1,200, $800, and $400. Each person pays 20% of their income toward rent.
Rooms of 200, 150, and 100 sq ft total 450 sq ft. The largest room pays 200/450 × $2,400 ≈ $1,066.67, the middle room ≈ $800.00, and the smallest ≈ $533.33 — summing exactly to $2,400.
If one roommate moves in on the 16th of a 30-day month, enter 15 days for them and 30 for the others. Their share shrinks in proportion to the nights they actually live there.
"Fair" is a household decision, not a formula. A few guidelines help most groups settle quickly:
Once rent is settled, plan the rest of your shared finances. Build a shared spending plan with the budget calculator, compare the long-term cost of renting against ownership with the rent vs. buy calculator, translate a salary into the monthly income figure you need for an income-based split with the salary to hourly calculator, and divide a shared dinner bill with the tip calculator.
A clean split on paper still needs a few practical guardrails to keep the household running smoothly:
This calculator is an estimating tool, not legal or financial advice. Your lease — not a spreadsheet — defines who is legally liable to the landlord. Use the results to reach a fair agreement among roommates, and consult your lease or a qualified professional for questions about liability, subletting, or local tenancy law.
There is no single 'correct' way. The four common methods are an even split (everyone pays the same), an income-based split (each person pays in proportion to what they earn), a room-size split (larger or private rooms pay more), and a days-occupied split (useful when someone moves in mid-month or travels often). The fairest method is the one all roommates agree on before signing the lease.
An even split is simplest and works well when bedrooms are similar and incomes are close. An income-based split reduces financial strain on lower earners by charging each person the same percentage of their pay, which many households find fairer when salaries differ a lot. Either way, write the agreement down so expectations are clear.
Each roommate's share is proportional to the square footage (or relative size) of the space they use. If one bedroom is 200 sq ft and another is 150 sq ft, the larger room pays 200 / 350 of the rent. People often add the value of private bathrooms, closets, or a balcony by adjusting the size number they enter.
Use the days-occupied method. Enter the number of nights each person will actually live in the unit during the period, and the calculator divides rent in proportion to those days. For a true single-tenant proration, charge (monthly rent ÷ days in the month) × days occupied.
Each share is rounded to the nearest cent, and any leftover cents from rounding are distributed one at a time to the people with the largest fractional remainders. This 'largest remainder' approach guarantees the individual shares always add up to the exact total rent, so no money is lost or invented.
Yes. The same logic applies to utilities, internet, the security deposit, and shared supplies. Many households split rent by room size but utilities evenly, since everyone uses heat and electricity regardless of bedroom size. Decide the method for each shared cost up front.
This calculator is an estimating tool, not legal advice. Your lease defines who is liable to the landlord, and most leases make all named tenants jointly responsible for the full rent. A separate roommate agreement can document how you split costs among yourselves, but it does not change your obligations to the landlord.
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