Rent Split Calculator

Splitting rent evenly feels simple until one person has the big bedroom with its own bathroom and another has a box room. This calculator divides the rent by bedroom size, with an adjustable part of the rent for shared space split equally, by income, or evenly per person. It handles rooms shared by two people and shows each room's monthly amount and the cost per person. A chart shows each room's share of the whole.

By room size: share = common part ÷ people + private part × room area ÷ total bedroom area

By income: share = rent × your income ÷ total income

Evenly: share = rent ÷ number of people

The common part is the percentage of rent you assign to space everyone uses, such as the kitchen, living room and shared bathrooms. Splitting it per person reflects that everyone uses it equally, while the bedrooms are charged by size.

By bedroom size only. Rent of $2,400 with bedrooms of 200, 150 and 150 square feet gives Room A $960, Room B $720, Room C $720.

With 30% for common space. The same flat with 30% of the rent shared equally gives Room A $912, Room B $744, Room C $744. The big room still pays more, but the gap narrows because everyone shares the kitchen and living room equally.

By income. A couple paying $2,000, earning $70,000 and $45,000, would pay Alex $1,217, Sam $783.

There is no single right figure. One approach is to measure the shared rooms and divide their area by the total floor area of the home. Another is to agree a round number, such as 25 to 40%, that everyone accepts. A higher common share brings the payments closer to an even split; 0% charges entirely by bedroom size. Try a few values and pick the one the household agrees is fair before signing the lease.

Room size is a proxy for value, but features matter too. A simple way to include them is to add their area to the room that gets them: a private bathroom of 40 square feet adds 40 to that room's area. For features without an obvious size, such as a parking space or the quietest room, agree a fixed monthly amount, subtract it from the rent before using the calculator, and add it back to that person's share.

Couples and families often split housing in proportion to income so that each person spends the same share of their earnings on rent. It can also work for friends with very different incomes, but it needs openness about pay. Use take-home pay if that is what the household budgets with, and revisit the split when incomes change. Utilities and groceries can be split the same way or tracked separately with the expense split calculator.

Most leases make every tenant jointly responsible for the whole rent, so the landlord can ask any one of you for the full amount if someone does not pay. A short written roommate agreement that records the split, the due date, how utilities are shared and what happens when someone moves out avoids disputes later.