Inspired by the tremendous turnout in our What's Your Rent? survey yesterday and not wanting to leave anyone out today, we thought we'd see how big our reader's homes are. Again, we figure that our apartment is small at 250 s/f, but we may be very surprised to find out that most readers live in similarly small spaces. Tell us everything, darling.... (Jill really wants you to measure accurately, so if you don't know how, take a look below). Official Measuring Procedures? Take the length and width of your apartment as if it was a rectangle and multiply together to get gross square footage (this included closets, bathrooms, etc). Next, subtract any volumes that lay outside of your apartment such as common stairways, halls, or other apartments.