Rent split calculator by room size
Put in the rent and the size of each private room. The rent follows that floor area, and the numbers move while you type.
The slider beside each name is the other half of the argument. Leave them all where they are and nothing happens; move one up and that person pays more while everybody else pays less. Split by Peanut holds the same arithmetic in a page the whole flat can open.
What each room pays
- Flatmate 114 sqm, 33.3% of the rent
- €500.00
- Flatmate 214 sqm, 33.3% of the rent
- €500.00
- Flatmate 314 sqm, 33.3% of the rent
- €500.00
- Rent€1,500.00
- Floor area measured42 sqm
Rent rarely divides evenly, so whatever is left at the end goes to the largest fractions first, one unit each. The column adds up to the rent exactly.
Where the measuring stops
Somebody in the flat will ask where this ends — the kitchen next, then the hot water, then who is home enough to use either. The line here is drawn at what gets measured once. A bedroom is the same size in November as it was in March, so the rent it carries can be settled in one conversation; a kettle would need a new one every week.
The size of the gap decides whether to have that conversation at all. If the biggest room and the smallest come out within small change of each other, a flat gets more from leaving the rent alone than from reopening it every month.
When a spreadsheet is the better tool
A household that agreed this a year ago and pays by standing order does not need a page for it. A spreadsheet holds an agreement fine once the argument is over. This is for the part before that, where the number is still being decided and somebody has to show the working.
Good to know
Split is free forever, with nothing to upgrade to.
158 currencies, converted at the day’s rate.
A room holds up to twenty people.
Split records a payment rather than making one. It does not check with a bank and cannot.
Put the numbers where the flat can see them
Takes ten seconds. No email, no password, no download.
Start a splitQuestions
- How do you split rent by room size?
- Measure the private rooms, add the floor area up, and give each person the same proportion of the rent as their room is of that total. Shared space stays out of the sum, because everybody has the same claim on it.
- What does the slider beside each name actually do?
- It is five notches, and the notch is the weight it puts on the room: notch one counts that room once, notch five counts it five times, and everybody’s counted room is put back over the whole to give the shares. While every slider reads the same the multiplier divides straight back out and the rent follows room size alone, so a flat that would rather not have this conversation can leave the sliders level and lose nothing. Move one up and that person pays more and the rest of the flat pays less.
- How do you split rent when one flatmate earns more?
- Move their slider up, or do not. Their room is then counted more times than everybody else’s, so their share goes up and the rest of the flat’s comes down — the number moves toward what each person can pay without ever losing sight of what each person gets. It is a method rather than a verdict, and a household that would rather split on room size alone should leave the sliders level.
- Why does one flatmate pay a fraction more than the others?
- Rent rarely divides evenly. The page rounds every share down first, then hands whatever is left over to the largest fractions, one unit each, so the column adds up to the rent rather than to a hair under it.