What does “envy-free” mean?

A division is envy-free when no participant would rather have someone else’s room at the price that person is paying — everyone considers their own outcome at least as good as anyone else’s. It is a stronger fairness guarantee than splitting the rent equally.

Does it work for 2, 3, 4 or more roommates?

Fair Divider handles 2 to 10 participants, as long as the number of rooms matches the number of participants.

Does it cost anything? Do I need an account?

Fair Divider is completely free and requires no account, no sign-up and no email address.

What is the difference between one-device and separate-devices mode?

In one-device mode, a single phone or laptop is passed around and each person takes their turn on it. In separate-devices mode, each participant uses their own phone in real time from anywhere. Both modes produce the identical result.

Rent Split Calculator — Free & Fair

Who it’s for

Anywhere people share a place and the rooms aren’t equal:

Flatmates renting a home together with different rooms
A group splitting a holiday rental
Erasmus or exchange students sharing a flat for a term
Students in a shared student flat
Friends or a couple moving in together
Coworkers or remote workers in a coliving space
A group sharing a holiday villa, ski chalet or beach house
Anyone splitting rent when one room is bigger or has an ensuite

How it works

Three steps; duration depends on the group's choices and precision.

Set up the division
Enter the total amount to divide, add each participant, and give each room a short description.
Each person picks their preferred room
At each turn, one participant selects the room they prefer at the prices currently shown. No prior agreement is needed. You may pick the same room several times while the price adjusts. That's normal, even if it feels repetitive.
Read the result
Fair Divider shows who gets which room and what each person pays. The split covers the full total you entered.

Full walkthrough

What “envy-free” means — and why it matters

Envy-free means no participant would rather have someone else’s room at that person’s price. Everyone ends up with a deal they consider at least as good as any other.

Each party chooses a room at the proposed prices; prices adjust after each choice. The result is approximately envy-free within the precision shown by the interface, based on participants' choices. Accept a proposal at that precision or continue refining it.

Example: €1,000 split three ways

Three rooms, one shared rent of €1,000 — here is a typical envy-free result:

Participant	Room	Pays
Ana	Large room, balcony	€420
Ben	Medium room	€330
Carla	Small room	€250
Total		€1,000

These illustrative prices total €1,000; an actual result depends on the group's choices and displayed precision.

Try these numbers

Frequently asked questions

What does “envy-free” mean?: A division is envy-free when no participant would rather have someone else’s room at the price that person is paying — everyone considers their own outcome at least as good as anyone else’s. It is a stronger fairness guarantee than splitting the rent equally.
Does it work for 2, 3, 4 or more roommates?: Fair Divider handles 2 to 10 participants, as long as the number of rooms matches the number of participants.
Does it cost anything? Do I need an account?: Fair Divider is completely free and requires no account, no sign-up and no email address.
How accurate is the result?: The result is approximately envy-free within the precision shown by the interface, based on participants' choices. Accept a proposal at that precision or continue refining it.
What is the difference between one-device and separate-devices mode?: In one-device mode, a single phone or laptop is passed around and each person takes their turn on it — ideal when everyone is together. In separate-devices mode, each participant uses their own phone in real time from anywhere. Both modes produce the identical result.

A rent calculator that’s fair by design

Fair Divider is free, available in nine languages, and requires no account. Made by Binary Spirit S.L.

Open the calculator

Fair Divider on every device

Splitting with roommates? Everyone joins the same division from any device — on the web, in the app, or a mix of both.

Free on the web, on iPhone, and on Android.

Download on theApp Store Get it onGoogle Play

Who gets which room?

How do you want to divide?

Your past results

Setup

Pass the phone to

Intermediate Division Proposal

Final Fair Division Found!