Roommate Rent Split Calculator

Three fair ways to split the rent

An even split is the simplest arrangement — divide rent and utilities by the number of roommates and everyone pays the same. It stops feeling fair when one person gets the master bedroom with a private bathroom while another sleeps in a converted den. A weighted split fixes that: each share equals the household total multiplied by your weight, divided by the sum of everyone's weights. Weight by square footage and the biggest room pays proportionally more; weight by income and everyone contributes the same percentage of what they earn. Example: with $2,580 total and bedrooms of 140, 100 and 120 sq ft, the shares come out to $1,003.33, $716.67 and $860.00 — rounded so the pennies always add up to the exact total.

How to use it

1. Enter your total monthly rent and your average monthly utilities.
2. Choose a split method: even, weighted by room size, or weighted by income.
3. Add a row for each roommate and type their names.
4. For weighted splits, fill in each person's room size in square feet or their monthly income.
5. Read each share in the result cards — everything updates live, and the × button removes a row.

These results are estimates only, not professional, financial or legal advice — your lease and whatever your household agrees to in writing decide what each person actually owes.

FAQ

Should utilities be split the same way as the rent?

Many households weight rent by room size but split utilities evenly, since everyone uses roughly the same power and internet. For that hybrid, run the calculator once with only rent entered, again with only utilities, and add each person's two shares.

How do I measure room size?

Length times width in feet is close enough. If a room comes with a private bathroom, balcony or walk-in closet, add some square footage for it — the weights only need to capture relative value, not survey-grade precision.

Is an income-based split actually fair?

It depends on your household. Proportional-to-income splitting keeps housing at a similar share of each person's pay; others feel equal space deserves equal rent regardless of salary. Agree on the method before anyone signs the lease.

Is my information private?

Yes. Everything runs in your browser — names, incomes and rent figures never leave your device, and nothing is stored after you close the page.