Split monthly rent between two or three people in proportion to each person’s income and see every percentage and payment.
Calculator Functions
| Function | What it does | What it requires |
|---|---|---|
| 2 people | Splits a monthly rent between two people in proportion to their incomes | Requires the total monthly rent and the income of each of the two people |
| 3 people | Splits a monthly rent between three people in proportion to their incomes | Requires the total monthly rent and the income of each of the three people |
Incomes can be monthly or yearly, gross or take-home, as long as everyone uses the same basis. Each result lists what every person pays, each person’s percentage of the combined income, the combined income and the rent as a percentage of it. Optional names replace Person 1, Person 2 and Person 3 in the result.
Split Rent By Income Formulas
| S | One person’s share of the rent ($ per month) |
| I | That person’s income ($) |
| T | Combined income of everyone on the lease ($) |
| R | Total monthly rent ($) |
Each person pays the same fraction of the rent as they earn of the combined income. Someone with no income pays nothing, and the combined income has to be above zero.
2 people
With incomes of $40,000 and $60,000, the combined income is $100,000 and the income fractions are 40% and 60%. A $1,000 rent splits into 0.40 × 1,000 = $400 and 0.60 × 1,000 = $600.
3 people
With incomes of $5,000, $3,000 and $2,000 a month, the fractions are 50%, 30% and 20%. A $2,000 rent splits into $1,000, $600 and $400.
Rounding to the cent
The rent is rounded to the nearest cent, and each share is first rounded down to a whole cent. Any cents left over go one at a time to the people whose shares were cut by the largest fraction of a cent, with ties going to the person listed first. The payments therefore always add up to the rent exactly. Three equal incomes and a $1,000 rent give $333.34, $333.33 and $333.33.
Limits of This Estimate
- A split by income is one arrangement a household can agree on. It is not a measure of what is fair or affordable, and it has no legal standing by itself.
- Room size, private bathrooms, parking, utilities and other shared costs are left out unless they are part of the rent entered.
- All amounts are treated as the same currency and the same pay period. Nothing is converted between gross and take-home pay or between monthly and yearly income.
