Deadweight (D.W. / DWT / DWAT / DWCC)
The most common, and useful, measurement for shipping as it measures cargo capacity: The number of tons (2240 lbs.) of cargo, stores and bunkers that a vessel can transport. It is the difference between the number of tons of water a vessel displaces 'light' and the number of tons it displaces 'when submerged to the 'deep load line'.' A vessel's cargo capacity is less than its total deadweight tonnage.