A rectangular room that measures 16 feet by 9 feet has a total of 144 square feet of floor space. Square footage of a regular-shaped room is determined by multiplying its length by its width.
Determining the square footage of a room is helpful in calculating how much flooring is needed as well as how much furniture can fit in the room. To determine paint or wallpaper requirements, the square footage of the walls must be determined. This involves multiplying the width of each wall by its height and adding the sums together. The abbreviations "sq. ft." and "ft^2" are used with measurements of square footage.