Rent Split Calculator

Roommate rent-sharing tool

Rent Split Calculator

Divide monthly rent equally, in proportion to income, or by private room size while allocating part of the rent equally for shared space. Currency changes formatting only; it does not convert values.





Roommates and split basis
Roommate

Equal shares divide the rent by the selected number of roommates.

Rent split formulas

Equal split: each share = total monthly rent ÷ number of roommates.

Income split: roommate share = total rent × roommate income ÷ total roommate income.

For a room-size split, choose what percentage of rent represents private bedrooms. That portion follows each private room’s area; the rest represents shared space and is divided equally.

Room-size share = rent × shared percentage ÷ roommates + rent × private percentage × room area ÷ total private-room area.

The calculator balances displayed shares to the cent so the rounded roommate amounts add back to the displayed total rent.

Checked examples

Equal split: US$3,000 divided among three roommates is US$1,000 each, or 33.3333% of the rent per person.

Income split: With monthly incomes of US$4,000, US$3,000 and US$2,000, the income weights are 4/9, 3/9 and 2/9. A US$3,000 rent becomes US$1,333.33, US$1,000.00 and US$666.67 after cent balancing.

Room-size split: For rooms of 200, 150 and 100 square feet and a 50% private-room allocation, half of US$3,000 is divided equally and half follows room area. The shares are US$1,166.67, US$1,000.00 and US$833.33.

Choosing a fair method

  • An equal split is simple when bedrooms and finances are broadly comparable.
  • An income split changes the rent burden in proportion to the incomes entered. Use the same income period for everyone.
  • A room-size split can reflect different private spaces while still assigning value to the kitchen, living room and other shared areas.
  • Roommates can agree on a different method. Record the agreement and decide separately how utilities, parking, storage, deposits and one-time fees will be handled.

Important limits

  • This tool performs allocation math; it does not create or amend a lease and does not determine legal responsibility to a landlord.
  • Income values are used only as relative weights. Enter them in the same period and currency; the calculator does not store or verify them.
  • Room sizes can use square feet or square meters, but every roommate must use the same unit. Only the proportions affect the result.
  • The room-size method does not automatically price bathrooms, views, closets, parking or occupancy by couples. Include such differences only through a separate roommate agreement.
  • Limits: 2–6 roommates, rent up to 1 billion currency units, basis values up to 1 billion, and private allocation from 0% to 100%.

Related calculators

Check whether the total housing cost fits the household budget with the Rent Affordability Calculator, model a future change with the Rent Increase Calculator, or organize income and expenses with the Budget Calculator.