Artikel 41

Having determined the area of each transverse section at its correct position, the cubic capacity of the space below the tonnage deck is ascertained as follows:
The areas of the first and last transverse sections are multiplied by 1.
The areas of even-numbered transverse sections are multiplied by 4.
The areas of odd-numbered transverse sections (other than first and last) are multiplied by 2.
The sum of these products is to be multiplied by one-third of the common interval between the transverse sections. This last product gives the cubic capacity of the space below the tonnage deck in cubic feet or in cubic metres. The under-deck tonnage in register tons is obtained by dividing the number of cubic feet by 100. If cubic metres are employed, these shall be converted into register tons by multiplying by 0.353.
After having calculated the cubic capacity of the space below the tonnage deck, the cubic capacity of the spaces referred to in Article 29 or Article 31, paragraph 2, will be added thereto or deducted therefrom, as the case may be, and the remainder will constitute the under-deck tonnage of the ship.