Finance & property Australia
Rent Split Calculator Australia
Splitting the rent equally is simple but not always fair when one room is bigger or has an ensuite. Enter the total weekly rent, each room's size and any premium for extras, and the calculator shows what each person pays, plus an equal share of the bills.
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Largest room pays
โSmallest room pays
โ
Average per person
โ
Bills per person each month
โ
Each person's weekly cost
โ
Bond per person (4 weeks' rent)
โ
Each room
How do I split the rent fairly between flatmates?
Subtract any premiums for extras like an ensuite, divide the rest by room size, then add the premiums back to the right rooms. For $1,900 a week across rooms of 16, 12 and 10 mยฒ with a $60 ensuite premium, the biggest room pays $834.74 and the smallest $484.21.
Fair ways to split
Equal shares work when the rooms are the same. Otherwise, splitting by size or by a points system reflects what each person gets. Size is easy to measure, and a premium covers extras. Some households also adjust for a shared living area used more by one person, or for someone who works from home and uses more power.
Whatever you choose, write it down so it is not a surprise later.
Bills and the lease
Utilities are usually split equally, though a heavy user can be asked to pay more. Set up a shared account or use an app, and agree what happens to the bond and the bills when someone moves out. Most states cap the bond at about four weeks' rent, and it should be lodged with the state bond authority.
To see how rent compares with buying, use the rent vs buy calculator.
How this is calculated
The rule, step by step, so you can check any figure by hand.
base rent = total rent โ the sum of premiumseach room's share = base rent ร room size รท total room size + its premiumbills per person = monthly bills รท number of peopleweekly cost per person = rent share + bills ร 12 รท 52 รท peoplebond per person = four times the room's weekly rent
Dividing by room size is the simplest fair rule, and adding a premium for an ensuite, a parking space or a larger wardrobe handles the things size does not. Agree the premium amounts in the share house before you sign, since they are the part flatmates are most likely to dispute.
Everyone named on the lease is usually responsible for the whole rent, not just their share, so agree on what happens if a flatmate leaves. Most states cap the bond at about four weeks' rent, and it should be lodged with the state bond authority.
A worked example
$1,900 a week, rooms of 16, 12 and 10 mยฒ, a $60 ensuite premium on room 1, bills of $240 a month.
- Room 1$834.74
- Room 2$581.05
- Room 3$484.21
- Bills each$80.00 a month
- Check: total$1,900.00
Rooms pay $834.74, $581.05 and $484.21 a week.
Adjust the premium until everyone agrees.
Moving in and out
When a flatmate leaves, the share of the rent can be re-split among the rest, or a new flatmate can take the room. The landlord or agent needs to approve changes to who is on the lease.
What it leaves out
Differences in how long each person stays, shared furniture, internet speed plans and food are not modelled.
What this calculator does not do
- Up to four rooms
- Premiums are your agreed amounts
- Bills split equally
- Not legal advice
Common questions
How do I split rent by room size?
Divide the base rent by room size and add any premiums.
What is a fair premium for an ensuite?
Whatever the household agrees; it often reflects the extra value of the room.
How should bills be split?
Equally, unless usage differs a lot.
Who is responsible if a flatmate leaves?
Everyone on the lease is usually responsible for the whole rent.
How much is the bond?
Usually up to about four weeks' rent.
Where these numbers come from
- MoneySmart โ ASIC's money guidance Independent guidance on budgeting, renting and tax
Method last reviewed 2026-10-28 This calculator uses fixed rules rather than rates that change, and its method is re-checked against the sources above at least once a year. Out of date? Tell us and we will fix it.
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