CBM in Shipping stands for Cubic Meter. This is the most everyday unit used for the measurement of volumetric cargo.
Using this application you can calculate CMB, CFT, Gross Weight, Volume Weight etc.
Please note that this calculator is intended only as a quick guide. In practice, actual loading will depend on accurate calculations based on how the items are loaded in the container and whether the dimensions of the cartons leave unusable space. Load factors will vary based on carton size and how they are stowed inside the containers.