There are 117 square units in an office that measures 13 by 9 square units. This is defined as the square footage of the office.

Length x width = area is the formula for calculating the area of a figure. 13 units by 9 units indicates that the office is 13 units long and 9 units wide. The area is thirteen times nine, or 117 square units. Due to the multiplication of two measurements of the same unit, area is measured in square units. The area is 117 square feet if the office’s units are feet.