gross tonnage nor gross register tonnage should be confused with measures of mass or weight such as deadweight tonnage or displacement. Gross tonnage, along...

Tonnage is a measure of the cargo-carrying capacity of a ship, and is commonly used to assess fees on commercial shipping. The term derives from the taxation...

measures of gross tonnage or net tonnage (and the legacy measures gross register tonnage and net register tonnage). Deadweight tonnage was historically...

Net tonnage (NT, N.T. or nt) is a dimensionless index calculated from the total moulded volume of the ship's cargo spaces by using a mathematical formula...

Gross register tonnage (GRT, grt, g.r.t., gt), or gross registered tonnage, is a ship's total internal volume expressed in "register tons", each of which...

The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes' principle, by first...

A tonnage tax is a taxation mechanism that can be applied to shipping companies instead of ordinary corporate taxation. The tax is determined by the net...

Net register tonnage (NRT, nrt, n.r.t.) is a ship's cargo volume capacity expressed in "register tons", one of which equals to a volume of 100 cubic feet...

Tonnage and poundage were English duties and taxes first levied in Edward II's reign on every tun (cask) of imported wine, which came mostly from Spain...

This is a list of the busiest seaports by cargo tonnage, the total mass, or in some cases volume, of actual cargo transported through the port. The rankings...