📋 In This Guide
Why "Just Split It Evenly" Often Isn't Fair
Splitting rent equally is the simplest approach, but it isn't always the fairest one. A roommate with a spacious master bedroom and private bathroom occupying disproportionately more space shouldn't necessarily pay the same as someone in the smallest room — and household money disagreements are one of the most common sources of roommate conflict. Agreeing on a clear, calculated method upfront avoids awkward renegotiation later.
Equal Split
Simplest — works well for similar rooms and shared amenities
By Room Size
Proportional to each bedroom's square footage
Custom Share
Manually agreed percentages for any other factor
The Three Split Methods Explained
Equal Split
The total is divided by the number of roommates. Straightforward, and appropriate when rooms and amenities are genuinely comparable.
By Room Size
Each roommate's share is proportional to their room's floor area relative to the total. A larger room pays a proportionally larger share.
Custom Share Percentage
Roommates manually agree on a percentage for each person — useful when factors beyond room size matter, like a private bathroom, balcony access, or an intentional income-based arrangement.
Should Utilities Split the Same Way as Rent?
Not necessarily. A common and often fairer pattern is splitting rent proportionally (by room size or custom share) while splitting shared utilities like WiFi, electricity for common areas, and water equally — since everyone typically uses the kitchen, living room, and internet connection roughly the same amount regardless of bedroom size.
Planning a savings goal together too?
Calculate how much to save monthly toward a shared goal, no interest assumed.
Worked Example
5 Tips for Avoiding Roommate Money Conflicts
Frequently Asked Questions
It depends on your situation. Equal splitting works for similar rooms. Room-size proportional splitting is fairer when bedrooms differ significantly. Custom percentages work when roommates have agreed on other factors.
Not necessarily. Many households split rent proportionally but split utilities equally, since common-area usage doesn't scale with bedroom size.
The room-size proportional method calculates each share based on square footage relative to total livable space — larger rooms pay proportionally more.
Some households split costs proportional to income instead. This calculator's custom percentage mode can handle this if roommates agree on it.
Not automatically — but the custom percentage mode lets you manually agree on and enter a higher share for the roommate with the extra amenity.
No. All calculations happen instantly inside your browser using JavaScript. Nothing entered is uploaded, logged, or stored on any server.