As per the standard rules of the library, the square footage for user seating varies depending on the type of seating, i.e., lounge chair, table seating, etc. As a general rule of thumb, for table seating use 25 square feet per seat; for study carrel seating use 30 square feet per seat; and for seating in lounge chairs use 35 square feet per seat. As a general average, designers can use 30 Square feet per seat.