There is little or no direct relationship between net tonnage (NT) and deadweight cargo capacity (DWCC). Net tonnage is a dimensionless index calculated from the total moulded volume of the ship's cargo spaces by using a mathematical formula. Net tonnage is not a measure of the weight of the ship or its cargo, and should not be confused with terms such as deadweight tonnage or displacement.
It is, however, possible to relate dwcc to hold volume (ie