How does an equal rent split work?
Add rent and utilities, then divide by the number of people.
Rent Split Calculator
Divide rent—and optional utilities—evenly or proportionally to each roommate’s income.
Enter rent and split method
Add rent and utilities, choose equal or income-weighted split, and list incomes when needed.
About this calculator
How to use Rent Split Calculator, plus the formulas and logic behind the results.
Tool description
Equal mode divides total housing cost by headcount. Income mode assigns each person a share equal to their income divided by the sum of incomes.
How to use
- Enter total rent and optional utilities.
- Choose equal split or income-weighted split.
- For equal mode enter headcount; for income mode list each income.
- Select Calculate to view each person’s share.
Formulas & reference
Total cost = rent + utilitiesEqual share = total ÷ peopleIncome share = total × (person income ÷ sum of incomes)
Split tips
- Include utilities only if shared
- Income mode needs one income per roommate
- Equal mode needs a headcount
- Shares always sum to total cost
Calculation logic
Utilities default to zero when blank. Equal mode divides by people. Income mode parses incomes from the textarea and allocates proportional shares. Non-positive income totals are rejected.
Income weights use relative incomes only—currency units cancel out as long as everyone uses the same period.
Rent Split Calculator FAQ
Common questions about the calculation and how to interpret the estimate.
How does income-based splitting work?
Each person pays a fraction of the total equal to their income share.
Are utilities required?
No. Leave utilities blank to split rent only.
How should I enter incomes?
List one number per roommate, separated by commas, spaces, or new lines.
Do incomes need to be monthly?
Use the same period for everyone—monthly is common.
What if incomes sum to zero?
Income mode cannot allocate shares; enter positive incomes.