The number of cubic feet in a standard 20-foot dry goods shipping container is 1,197. In order to calculate cubic feet, it is necessary to know all of the dimensions of the container.
According to Sea Plus, a standard 20-foot shipping container measures 20 feet by 7 feet 9 1/4 inches by 8 feet 6 inches. Cubic feet is calculated by multiplying the total square feet by the height. Square feet is a calculation of width times length. Therefore, essentially, cubic feet is found my multiplying length X width X height. Since the width and height of the container are not even numbers, it is necessary to determine what percentage of a foot the remaining inches are. Once the total number of feet is determined, the numbers are multiplied to find the cubic feet.