The Founding Convention on Ship Tonnage

This IMO publication reproduces the Final Act of the 1969 International Conference on Tonnage Measurement of Ships, together with the International Convention on Tonnage Measurement of Ships that the conference produced. The convention established the internationally agreed method for calculating a vessel's gross and net tonnage, replacing the varied national systems used previously.

As an official International Maritime Organization text, it sets out the rules and formulae still used as the basis for tonnage certification today.

A reference document for surveyors, naval architects, ship registries and maritime students needing the primary source text on tonnage measurement.

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