1 Answer

Things You'll Need
Calculator

Instructions
1
Consider the following relationship between cubic and square feet.
Cubic feet = square feet x height. Hence
Square feet = cubic feet/height.
Height is the third dimension that allows the actual conversion between cubic and square units and is to be measured in feet. In our example, height is the thickness of a soil layer.

2
Divide the height/thickness (in inches) by the factor 12 to calculate the thickness of the layer in feet. In our example, height = 1.5 inch / 12 = 0.125 feet.

3
Divide the cubic feet by the height/thickness (Step 2) to convert the area to square feet. In our example, Area = 50 cubic feet / 0.125 feet = 400 square feet.

Read more: How to Convert Cubic Foot to Square Foot | eHow.com http://www.ehow.com/how_5621708_convert-cubic-foot-square-foot.html#ixzz2MoH1hK3B