Calculate tonnage by volume:
The gross tonnage of a ship has nothing to do with the weight of the ship. It is calculated based on the volume of the ship. It takes 100 cubic feet in the British system or 2.83 cubic meters in the metric system as one ton, and the results of the two calculations are the same. Therefore, there is no difference between the metric system and the British system in the gross tonnage. Its calculation method is to measure the volume of the enclosed space of each part of the ship. If you measure it in feet, you can divide the total volume by not 100; If measured in meters, the quotient obtained by dividing by 2.83 is the gross tonnage of the ship
The gross tonnage plays an important role in the various tonnages of ships, because it is used as the basis for ship registration and statistics. After the gross tonnage is calculated according to the central ship, the space used for loading cargo, passengers, etc. is net tonnage, except for the wheelhouse, engine room and other equipment or work needs on the ship