Wikipedia
Deadweight tonnage
Not to be confused with vessel displacement.
Deadweight tonnage (also known as deadweight; abbreviated to DWT, D.W.T., d.w.t., or dwt) or tons deadweight (TDW) is a measure of how much mass a ship is carrying or can safely carry; it does not include the weight of the ship. DWT is the sum of the weights of cargo, fuel, fresh water, ballast water, provisions, passengers, and crew.
DWT is often used to specify a ship's maximum permissible deadweight (i.e. when she is fully loaded so that her Plimsoll line is at water level), although it may also denote the actual DWT of a ship not loaded to capacity.
Usage examples of "deadweight tonnage".
As you can see on your monitors, it is a massive ship, roughly thirty percent heavier in deadweight tonnage than standard starships.