Rent Split Calculator
To split rent with this calculator, choose the agreed rule: divide the rent equally among distinct rooms and then among each room’s occupants, or allocate it in proportion to each person’s entered private-area share or income. Any leftover cents go to the largest fractional remainders, so the shares reconcile to the entered rent. A rent split decision remains with the household; this calculator applies the rule selected and does not choose it.
Three ways to split this rent
Cost, limits and the last cent
- Free use: calculating rent shares on this page requires no payment.
- No login: enter the rent and compare methods without creating an account.
- Calculation count: this page implements no calculation-count quota; change the entries and calculate again.
- No data upload: calculations run in your browser; this tool has no file upload or calculation API and does not send the entered names, rooms, areas or incomes to a server.
- One rent bill at a time: rent must be greater than zero and below $1,000,000; amounts accept up to two decimal places.
- Remainder allocation: take whole cents first, then give remaining cents to the largest fractional remainders; ties go to the larger exact share, then the earlier name in the list. Each method checks that the person totals equal the rent, and reports a difference instead of accepting an unbalanced result.
These are this page's allocation rules, not an industry standard or a change to anyone's lease.
What each method means here
By room: Divide the entered rent by the number of distinct room IDs, then divide each room’s share equally among the people assigned to that room. Before cents are allocated, a person’s share is rent ÷ distinct rooms ÷ occupants in that room. This method does not assign a premium for room size, amenities or privacy.
By area: Before cents are allocated, each person’s share is entered rent × that person’s private-area share ÷ the sum of all entered private-area shares. Split a shared room’s area between its occupants before entry; do not enter the whole room area for each occupant. Common areas are not separately weighted.
By income: Before cents are allocated, each person’s share is entered rent × that person’s income ÷ the sum of all entered incomes. Zero income gives a zero income-weighted share if someone else has positive income. This page does not calculate tax, verify earnings or choose which method the household should adopt.
Common questions
How do two people sharing one bedroom split rent with this calculator?
Enter the same room ID for both people. The By room method gives each distinct room an equal rent share, then splits a shared room's share evenly among its occupants. So a pair sharing one room divides that room's portion between them instead of each being treated as a separate room.
What if one roommate has no income or incomes are very different?
For By income, enter everyone's income for the same period and on the same gross or take-home basis. A person entered at zero receives a zero income-weighted share when at least one other person's income is positive; the remaining rent is divided in proportion to the positive incomes. The calculator rejects the income method if every entered income is zero.
Which split should we use if the room, area, and income amounts differ?
The displayed Difference is each method's total minus the entered rent: $0.00 is the expected check, even when individual shares differ across By room, By area, and By income. In the recorded $2,345.67 example, all three totals reconcile to $2,345.67 with a $0.00 difference. If this calculator finds a nonzero total difference, it reports an allocation error instead of accepting that result; it does not identify which room, area, or income entry might be wrong.
Implementation source: theeventable.com, this page's browser code. Self-calculated test inputs, verified in the browser on 2026-10-26: rent $1,800; room IDs A/B/B; private area shares 30/20/10; same-period incomes $5,000/$3,000/$2,000. By room: $900/$450/$450. By area: $900/$600/$300. By income: $900/$540/$360. Each method totals $1,800. Equal-share tests also reconciled $100; $999,999.99 was accepted, while a $1,000,000 rent, zero rent and an amount with more than two decimal places were rejected.
For a shared bill with tax, tips or prior payments, use the split bill tool. To normalize income periods before using the income method, see match income periods. See the rent split calculator example to check how each total reconciles. For a two-room choice exercise, see one splits, one picks rent test. To see how changing one income changes the other shares, use this rent-share change test. To write down the selected method, monthly shares, and payment handoff, use the roommate rent split worksheet.