A Freight Class Calculator is an online or manual tool used to determine the correct freight class for a shipment. In LTL shipping, freight class plays a big role in deciding the final shipping cost. If you choose the wrong freight class, you may end up paying more than expected. Freight class is based on a system created by the National Motor Freight Traffic Association (NMFTA). This organization developed a standard called the National Motor Freight Classification (NMFC). The NMFC system groups products into 18 different freight classes. These classes range from 50 (least expensive) to 500 (most expensive).. https://freight-classcalculator.com/