how do yoy figur cubic feet
Calculating Cubic Feet. To begin, find the dimensions. Dimensions include length, width and height for a cube or rectangular object. For example, the object may have a length of 3 feet, width of 4 feet and height of 5 feet.The formula for calculating cubic feet is: length x width x height.In this example, you multiply 3 x 4 x 5 to get 60 cubic feet.alculating Cubic Feet. To begin, find the dimensions. Dimensions include length, width and height for a cube or rectangular object. For example, the object may have a length of 3 feet, width of 4 feet and height of 5 feet.