divide the rent based on room desirability
Although dividing rent based on square footage is an easy way to calculate each roommates’ share, some rooms are just more desirable than others — and are thus worth significantly more.
For example, one bedroom on this floor plan has a large walk-in closet, a balcony, and private bathroom. The other bedroom in this apartment has a small closet and no other amenities.
In order to calculate rent based on room desirability, you and your roommates should assign a cost to each amenity and add it onto a fairly divided room price. We recommend making amenities cost no more than 2-5% of the total rent. In the case of the above floor plan, if the total rent was 2,000, a walk-in closet and balcony could cost $40 each, while the private bathroom would go for a little more at $100. This means the person in the larger bedroom would be paying $180 more than the person in the small bedroom ($1,180 versus $820).
In order to avoid conflict, try to assign values to these numbers before apartment hunting.