There is no direct conversion between cubic feet and square feet. Cubic feet refers to the three-dimensional volume of an object. Square feet refers to the surface area. It is possible to determine the square feet of an object's surface area using the dimensions from the cubic feet calculation.
Isolate the length and width
The formula for cubic feet of a typical square or rectangular object is length multiplied by width multiplied by height. Since you just need length and width for square footage, eliminate the height and just note the length and width of the surface area.
Set up the area formula
Substitute the actual length and width in the formula. If the object is 8 feet tall, 3.5 feet long and 2 feet wide, for instance, the formula is 3.5 x 2.
Calculate the result in square feet
Determination the result from multiplying length by width. In the example, 3.5 x 2 = 7. Therefore, the object's area is 7 square feet. Since the object's height was 8 feet, its volume is 8 x 7, or 56 cubic feet. However, it is not accurate to say that 56 cubic feet always converts to 7 square feet, as an object that is 14 feet tall, 2 feet long and 2 feet wide also has this same volume in cubic feet, but it has a different area in square feet.