How to split rent fairly
Split the rent in two pools. The shared spaces (kitchen, living room, hallways, laundry) are divided evenly per person, because everyone uses them. The rest is divided by each bedroom's size, multiplied by its perks: a private bathroom adds about 20%, a balcony 10%, a walk-in closet 5%.
A worked example
Three roommates, $3,000 a month. Bedroom 1 is 180 sq ft with an en suite and a walk-in closet, bedroom 2 is 140 sq ft, bedroom 3 is 110 sq ft. With 40% for the shared spaces, $1,200 becomes $400 each, and the other $1,800 follows the weights: bedroom 1 counts as 180 × 1.25 = 225.
Split evenly, everyone would pay $1,000. Split this way, the primary bedroom pays $252.63 more and the smallest room saves $183.16.
Choosing the shared share
There's no official number. Go higher, 45 to 50%, when the shared rooms are big and everyone uses them. Go lower, 30 to 35%, when people mostly live in their own rooms. Not sure? Start at 40% and move it until everyone agrees.
Questions
What's the fairest way to split rent?
Split the shared spaces (kitchen, living room, hallways) equally per person, because everyone uses them, and split the rest by bedroom size. Then add a premium for things like a private bathroom. Most people land on 30 to 50% for the shared part; 40% is a good start.
How much more should the room with an en suite pay?
A private bathroom usually adds about 20% to that room's weight, on top of any extra size. In a two-bedroom flat that tends to move the split from 50/50 to somewhere around 55/45 or 60/40.
How do we split rent with a couple in one room?
The couple's room pays its share by size like any other, and each of them pays a full per-person share of the shared spaces. Add a partner to a room and Quarters does both.
Do the amounts always add up to the rent?
Yes. Rounding is done so the parts add up exactly to the rent, to the whole unit or to the cent.
What about bills?
Add the monthly bills and they're split equally per person on top of the rent, since usage is hard to pin to one room.
Is it free? What do you store?
Free, no account. Your flat stays on this device and in the share link, so everyone can open the same split on their own phone.