Guide
A simple process for choosing a rent split method, writing down assumptions, and keeping the final number easy to review.
First decide whether the rooms are similar enough for an equal split. If they are not, identify what makes them different: bedroom size, private bathroom access, storage, light, privacy, noise, or layout.
Use the main rent split calculator when you want a general starting point.
A private bedroom can be valued by room size or features. Shared spaces may need a different rule if one room has two people and another has one. Keeping those assumptions separate makes the result easier to discuss.
A premium or discount should be visible and editable. If a room has a private bathroom, use the private bathroom calculator. If several features matter, use the uneven rooms calculator.
The most useful result names the total rent, rooms, formula, and visible assumptions. That makes it easier for roommates to review the same inputs instead of arguing about a mysterious final amount.
If an agreement already exists, use a calculator result as a discussion aid. It does not change a lease or signed roommate agreement.