Each product being moved by a LTL carrier has a freight class assigned. A single governing body known as the National Motor Freight Traffic Association (NMFTA) determines the products’ freight class. All carriers acknowledge the products classification that is assigned by this group.
Freight density ranges from 50 to less than 1. In most cases, the lower the density of your load, the higher the freight class. The freight class will range from 50 to 500. The lower the class, the cheaper the cost will be to move that item.
Typically items at lower classes will be items that are very dense, easy to transport and will typically have a low per pound value. Items listed at higher classes will be more bulky, difficult to transport with lower weights and are also more valuable.
Never guess. If you are not sure use a density calculator to get the closest possible