Square feet cannot be converted into feet because the two units measure different attributes of objects. Square feet are units of measurement for area, the space covered by an object, while feet are units of measurement for length and other measurements of the distance between two points.
A square foot is defined as the area of a square that measures one foot on each of its four sides. The formula for calculating the area of a rectangle is expressed as length times width; the designations are interchangeable for the purpose of this calculation because both refer to the distance between two points. In squares, which are a subset of rectangles, all four sides measure the same and need not be designated as length or width. The formula for area of a square is a², or the length of any side (represented by the variable a) multiplied by itself, or "squared."