Rent Split Calculator
Split rent and shared bills between 2 to 6 housemates evenly, by room weighting or percentage, with each person's weekly, fortnightly and monthly amount.
Weightings for housemates beyond this number are ignored.
Use room weightings such as 1.2, 1 and 0.8, or percentage shares such as 65 and 35. Ignored when splitting evenly.
Add electricity, gas, water or internet with the period shown on the bill.
Your results
Each housemate's rent
| Housemate | Rent share | Per week | Per fortnight | Per month |
|---|---|---|---|---|
| Housemate 1 | 40% | $360.00 | $720.00 | $1,560.00 |
| Housemate 2 | 33.3% | $300.00 | $600.00 | $1,300.00 |
| Housemate 3 | 26.7% | $240.00 | $480.00 | $1,040.00 |
Calculation breakdown
- Share
- household cost × (housemate weighting ÷ sum of all weightings)
- Converting periods
- per week = fortnightly ÷ 2 = monthly × 12 ÷ 52 = quarterly ÷ 13 = yearly ÷ 52
Worked example
$900 a week split by weightings 1.2, 1.0 and 0.8 (total 3.0) gives $360, $300 and $240 a week. Two housemates paying 65% and 35% of $1,150-a-fortnight rent plus $540-a-quarter utilities pay $400.75 and $215.79 a week.
Assumptions
- Weightings are relative, so 65 and 35 work the same as 0.65 and 0.35.
- Monthly amounts use 52 ÷ 12 weeks per month and quarterly amounts use 13 weeks.
- Bond, moving costs and one-off purchases are not included.
How this calculator works
Enter the total rent and how often it is paid, then split it between 2 to 6 housemates evenly, by room weighting or by percentage share. Add shared bills with their own periods, such as quarterly electricity, and see each person's amount per week, fortnight and month.
How to split rent fairly between housemates
For an equal rent split, give every housemate the same weighting. For an unequal split, assign a higher weighting to a room with more floor space, an ensuite, a balcony, better storage or another feature the household agrees is worth more.
The calculator adds every housemate's weighting, divides each person's weighting by that total, then applies the resulting share to the rent. Because the same unit is used throughout, weightings such as 1, 1 and 1 work exactly like 100, 100 and 100, and percentage shares such as 65 and 35 work directly.
- Equal rooms: use the same weighting for everyone
- Larger or better-equipped rooms: agree on a higher relative weighting
- Monthly amounts use 52 ÷ 12 weeks, so $500 a week is about $2,166.67 a month
Agree on shared spaces and bills separately
A room-based split is only one fair method. Housemates may prefer to divide part of the rent equally for shared spaces and divide the remainder by bedroom size or features. Discuss the method before signing or changing a household agreement.
Shared bills often arrive on different cycles from the rent, such as quarterly electricity and monthly internet. Enter each bill with its own period and the calculator converts everything to the same week, fortnight or month using 52 weeks a year, then splits bills either the same way as the rent or evenly. Bond, parking and one-off purchases still need a separate agreement.
Frequently asked questions
What if all rooms are the same size?
Give each housemate an equal weighting (e.g. 1 each) and the calculator will split the rent evenly.
How should I weight an ensuite or larger room?
There is no fixed formula. Agree on relative weights as a household after considering room size, privacy, storage and ensuite access, then record the agreement clearly.
How do I turn weekly rent into a monthly amount?
Multiply the weekly rent by 52 and divide by 12. For example, $500 a week is about $2,166.67 a month, not $2,000, because most months are longer than four weeks.
Can I include bills such as electricity and internet?
Yes. Enter up to three shared bills with the period shown on each bill, such as quarterly electricity or monthly internet, and choose whether bills are split the same way as the rent or evenly.
Content responsibility
Maintained by CalcAussie and last updated 24 October 2026. Checks applied: calculation method, worked examples, Australian terminology, material assumptions, official references where an external rule applies, and user-facing limitations.
Calculator results remain estimates based on the figures entered. Check material decisions against current official information and report a suspected error so it can be reproduced and corrected.
Results are estimates only and are not financial, tax, legal or credit advice.