Quick answer
Each person's share = total rent × their income ÷ total income. For $2,400 rent and incomes of $5,000 and $3,000, the shares are $1,500 and $900, against an equal split of $1,200.
Enter the total rent and each person's income. The calculator returns proportional shares and the equal split for comparison.
Related tools: Commute Cost Calculator: Monthly cost of commuting by car. Daily Savings Calculator: Amount to save each day to reach a goal. Gift Budget Calculator: Spending per recipient after a reserve.
How to use the Rent Split Calculator
- Enter total rent ($) (above 0).
- Type each person's income, for example 5000, 3000.
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Total rent | A number, in $ | > 0 |
| Each person's income | Text, such as 5000, 3000 | — |
Formula and method
Formula
share = total × income ÷ total income
IEEE-754 double precision; shown to the decimals indicated.
Shares are in the order the incomes are entered; an equal split is shown for comparison.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Total rent = 2400; Each person's income = 5000, 3000.
| Result | Value |
|---|---|
| Shares | $1,500.00, $900.00 |
| Equal split | $1,200.00 |
Example 2
Inputs: Total rent = 1800; Each person's income = 4000, 4000, 2000.
| Result | Value |
|---|---|
| Shares | $720.00, $720.00, $360.00 |
| Equal split | $600.00 |
Example 3
Inputs: Total rent = 900; Each person's income = 1500.
| Result | Value |
|---|---|
| Shares | $900.00 |
| Equal split | $900.00 |
The first line is the headline result (shares). Below it the rent Split Calculator lists equal split, which describe the same case from other angles. IEEE-754 double precision; shown to the decimals indicated.
Proportional versus equal
Equal splits are simple but take a larger share of the lower earner's pay. In the example, the equal split asks $1,200 of someone earning $3,000, which is 40% of income, while the proportional split asks 30% from each.
Other factors
Room size, private bathrooms and parking can justify adjusting the split. Agree on the method before signing the lease, and note that landlords hold all tenants responsible for the full rent.
How the result changes with total rent
Holding every other input at the first worked example, this table changes only total rent. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Total rent | Shares | Equal split |
|---|---|---|
| 1200 | $750.00, $450.00 | $600.00 |
| 2400 | $1,500.00, $900.00 | $1,200.00 |
| 4800 | $3,000.00, $1,800.00 | $2,400.00 |
| 9600 | $6,000.00, $3,600.00 | $4,800.00 |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Each person's income: left empty shows "Enter each person's income." beside that field and no result.
Choosing between the Rent Split Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Commute Cost Calculator](/lifestyle/commute-cost-calculator/) | one-way distance, commuting days per month and fuel economy | Monthly commute cost |
| [Daily Savings Calculator](/lifestyle/daily-savings-calculator/) | savings goal, already saved and days to reach the goal | Save per day |
| [Gift Budget Calculator](/lifestyle/gift-budget-calculator/) | total budget, recipients and held in reserve | Per recipient |
| [Parking Cost Calculator](/lifestyle/parking-cost-calculator/) | time parked, hourly rate and daily maximum | Parking cost |
| [Subscription Cost Calculator](/lifestyle/subscription-cost-calculator/) | monthly cost of each subscription | Annual cost |
Assumptions and limitations
- Incomes must be positive
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for each person's income to confirm this.
Frequently asked questions
Is proportional rent fair?
It is one fair approach; others weigh room size.
Do I use gross or net income?
Use the same measure for everyone.
Can I add more people?
Enter more incomes, separated by commas.
What does the Rent Split Calculator calculate?
Split rent in proportion to each person's income. It returns Shares and Equal split.
What formula does the Rent Split Calculator use?
share = total × income ÷ total income. Shares are in the order the incomes are entered; an equal split is shown for comparison.
What do I need to enter in the rent Split Calculator?
You enter Total rent ($) and Each person's income.
How is the result rounded or limited?
IEEE-754 double precision; shown to the decimals indicated. Incomes must be positive.
What is an example of a rent Split result?
With total rent 2400 and each person's income 5000, 3000, the shares is $1,500.00, $900.00.
Related calculators
- Commute Cost Calculator — Monthly cost of commuting by car.
- Daily Savings Calculator — Amount to save each day to reach a goal.
- Gift Budget Calculator — Spending per recipient after a reserve.
- Parking Cost Calculator — Parking cost with an hourly rate and a daily maximum.
- Subscription Cost Calculator — Yearly and long-term cost of monthly subscriptions.
- Travel Budget Calculator — Total trip cost from daily and one-off costs.
Sources
- ISO 8601-1: Date and time, representations for information interchange (calendar dates, ordinal dates and week dates)
- Gregorian calendar reform, papal bull Inter gravissimas (1582): the leap-year rule used for all dates
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.