Rent split calculator
The master bedroom with the ensuite should not cost the same as the sunless single next to the laundry — and eyeballing it breeds resentment. Set each room's size, ensuite and extras; the calculator weights the shares, keeps them in whole dollars that add back to the exact total, and splits the bond the same way. Copy the link and let the house argue with the maths instead of each other.
Shares always add back up to exactly what you entered. The link carries the whole setup — send it to the house.
How the weighting works
Every room starts equal, then gets weighted: small rooms carry 10% less than a medium room and large rooms 15% more; an ensuite adds 15%; each extra (balcony, built-in robes, aircon, a bay window worth bragging about) adds 4%, capped at four. Rent and bond are then divided in proportion to those weights. It's a starting point the whole house can see and tweak — fairness you can point at.
Settled on the numbers? Put them in writing with the free VIC flatmate agreement.
Fair splits, answered
How should a share house split the bond?
In the same proportions as the rent. If the big ensuite room pays a larger weekly share, it should carry the same share of the bond — one set of weights, applied to both, which is exactly what this calculator does.
Should the bigger room pay more rent?
Yes — room size is the biggest fairness factor in a share house split. With a medium room as the baseline, about 10% less for a small room and about 15% more for a large one is a defensible starting point the whole house can then tweak.
How much more should an ensuite cost?
Around 15% on top of that room's base share is a sensible premium. A private bathroom is the most contested perk in a share house — pricing it explicitly stops it becoming a silent grievance.
What if the split doesn't divide into whole dollars?
Round to whole dollars and give the leftover dollars to the largest shares. That's the calculator's method — shares always add back to exactly the total you entered, so nobody is short and nobody quietly overpays.