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Rent Split Calculator
Work out a fair share of the rent for every roommate. Choose an even split, split by room size, or split by income, add your shared utilities, and press Calculate.
Written by TopicDrill Editorial Team·Updated June 2026
Who pays what
Alex41%
Sam32%
Jordan27%
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How the rent split calculator works
Rent fairness comes down to one question: should everyone pay the same, or should the person with the bigger room or the bigger paycheck pay more? This tool keeps the base rent flexible while always dividing shared utilities evenly, because the kitchen, the wifi and the heat serve the whole household no matter whose room is largest.
Pick a method, type in each roommate's room size and income, and the calculator turns those numbers into weights. The donut chart shows the resulting split at a glance, and the results panel compares every share against a plain even split so you can see exactly who is paying more or less and by how much.
A quick example
Say the rent is $2,400, utilities are $300, and you split by room size. The rooms are 180, 140 and 120 square feet, totalling 440. The person in the largest room pays 180 divided by 440 of the rent, about $982, plus $100 of utilities, for $1,082. The smallest room pays roughly $655 in rent plus the same $100, for $755. Everyone covers an equal slice of the utilities, but the rent tracks the space they actually have.
Things to keep in mind
Weighting by room size assumes the bedrooms are the main difference; if one room has a private bathroom or a balcony, you may want to nudge its share up by hand. Whatever you agree on, get it in writing, especially on a joint lease where everyone is on the hook for the full rent. For tenant rights and lease basics, the HUD tenant rights page is a neutral starting point. To divide one-off shared costs like groceries or a cleaner, try our bill split calculator.
Frequently asked questions
How should roommates split rent fairly?
There is no single right answer, but the fairest splits tie each person's payment to what they use. Splitting by private room size charges more to whoever has the larger bedroom, while splitting by income keeps the rent proportional to what each person can afford. An even split is simplest when rooms and budgets are similar.
Should utilities be split the same way as rent?
Usually not. This calculator always divides utilities evenly because electricity, water and internet pay for the shared parts of the home that everyone uses regardless of room size or income. Only the base rent is weighted by the method you choose.
How does the room-size method work?
Each person's rent is set in proportion to their private bedroom's square footage. If one room is 180 square feet and another is 120 square feet, the first roommate pays 180 divided by the total square footage of all rooms, times the rent. Bigger room, bigger share.
Is splitting rent by income legal and common?
Splitting rent by income is a private agreement between roommates and is perfectly allowed. It is common among couples or friends with very different earnings who still want to share a nicer place. Put whatever method you agree on in writing so everyone is clear on the monthly amounts.
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