To properly pack such containers, the width, height, and length of the container must be measured and then multiplied. A twenty-foot-long container, for example, may be five feet broad and 10 feet height. When these numbers are multiplied together (i.e., 5 x 10 x 20), the result is 1,000 cubic feet. This is the maximum volume that can be packed into this container. There are several methods used to calculate container size. The three most common methods are: (1) cubic, (2) metric, and (3) English. In the United States, the cubic method is used most often. It involves multiplying the length by width by height. For example, if I want to know how much space a twenty-five foot container will take up, I would multiply 25 by 100 by 100, which equals 125,000 cubic inches. In Europe, where containers are usually metric, the metric method is used. For example, to determine how much space a twenty-five meter container will take up, I would multiply 25 by 100 by 100, which equals 6250 cubic centimeters. In England, where containers are usually called TEU's (Twenty-Foot Equivalent Units), the TEU method is used. It involves multiplying the length by the height, then dividing by 1000 to get the total volume in TEU's.