Rent Split Calculator

No single method is 'perfect'—it depends on what roommates agree is fair. Common methods: (1) Equal split — simplest, everyone pays the same. (2) By room size — larger rooms pay more. (3) By income — proportional to earnings. (4) Hybrid — 50% equal + 50% room-based.

Calculate each room as a % of total rentable area. Shared spaces (kitchen, bathroom, living room) are split equally among all. Example: 4 rooms (100, 120, 140, 160 sq ft) + 300 shared = assign shared proportionally to room sizes.

Depends on your lease. Some split rent + utilities together. Others split rent by room and utilities equally. Get explicit agreement upfront to avoid disputes.

Add up all roommates' monthly incomes. Divide each person's income by the total to get their percentage. Multiply total rent by that percentage. For example, if you earn $4,000 of $10,000 combined income, you pay 40% of rent. This method ensures lower earners are not overburdened.

Most roommates treat a couple as two people for shared costs like utilities and common areas. For rent, the couple typically pays the room-size share plus a small premium (10-20%) for the extra person using shared spaces. Put the agreement in writing before move-in.

Measure private rooms and shared areas separately. Divide shared space costs equally among all roommates. Then add each person's private room cost based on square footage. This hybrid approach ensures everyone pays fairly for both private and communal spaces.

The Sperner method is a mathematical approach where each roommate secretly ranks room-price combinations. An algorithm finds a division where nobody envies another's deal. It produces envy-free allocations, meaning everyone prefers their own room at their price over any other option.

A private bathroom typically adds 10-15% to that room's share. Calculate base rent by room size first, then add a bathroom premium. For example, in a $3,000 apartment, the room with an ensuite might pay $100-$150 more monthly than an equivalent-sized room without one.

If parking spots come with the unit, include their value in the split. Only roommates using parking should pay for it. Deduct parking value from total rent, split the remainder by your chosen method, then add parking costs back to the relevant roommates.

The departing roommate typically pays their share through the end of the notice period or until a replacement is found. Remaining roommates can temporarily split the vacant share equally or cover it proportionally. Update your written agreement when the new roommate moves in.