Calculation
The gross tonnage calculation is defined in Regulation 3 of Annex 1 of The International Convention on Tonnage Measurement of Ships, 1969. It is based on two variables:
- V, the ship's total volume in cubic meters (m³), and
- K, a multiplier based on the ship volume.
The value of the multiplier K varies in accordance with a ship's total volume (in cubic metres) and is applied as a kind of reduction factor in determining the gross tonnage value - which does not have a unit such as cubic metres or tons. For smaller ships, K is smaller, for larger ships, K is larger. K ranges from 0.22 to 0.32 and is calculated with a formula which uses the common or base-10 logarithm:
Once V and K are known, gross tonnage is calculated using the formula, whereby GT is a function of V:
As an example, we can calculate the gross tonnage of a ship with 10,000 m³ total volume.
Then the gross tonnage is calculated:
Read more about this topic: Gross Tonnage
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