CDM stands for Cubic Decimeter. Currently, in Andhra Pradesh, 2 CDM equals 1 Kg. Items that are lightweight but take up more space are charged based on CDM. To calculate the weight of a consignment, multiply its length, width, and height (LxWxH), then divide by 2. For Tamilnadu, Karnataka, and Pondicherry, the CDM should be divided by 2.5 to obtain the weight in kilograms.