Rent Split Calculator

Divide rent fairly between flatmates by room size, income or equally.

Total rent	$3,000
Split by	Room size
Share split equally (common areas)	40 %
People (name and room size or income)	Alex 14 Sam 11 Jo 9

Total rent

Split by

Share split equally (common areas)

With room-size split: this part of the rent is shared equally, the rest by room size.

People (name and room size or income)

Each person pays

Alex $1,141 · Sam $982 · Jo $876

$3,000 split 40% equally and the rest by room size.

Rent split

Alex38%: $1,141
Sam33%: $982
Jo29%: $876

About the Rent Split Calculator

Enter the total rent, choose how to split it, and list each person with their room size (or income). With room size, choose what share is split equally for the common areas. The calculator gives what each person pays.

Splitting by bedroom size is fairest when rooms differ: share the common areas (kitchen, living room) equally and the rest in proportion to private space. Splitting by income suits couples.

The formula

Share = common ÷ people + (rent − common) × your room ÷ total room area

Worked example

3,000 rent; rooms of 14, 11 and 9 m²; 40% split equally

Common part: 1,200, so 400 each
The other 1,800 by room size: Alex 14 ÷ 34 × 1,800 = 741
Alex pays 1,141, Sam 982, Jo 876

Questions people ask

Is splitting by income fair?

It's common for couples with different incomes; agree it upfront.

What about bills?

Most households split utilities equally; add them separately.