Tonnage Measurements

The Vessel Registration and Tonnage Regulations of the Canada Shipping Act 2001 (CSA 2001) cover vessel ownership, registration and tonnage measurement and their purpose is to prescribe certain obligations to owners of registered vessels including the requirements pertaining to tonnage. Tonnage measurement is mandatory for the purpose of registration.

Please refer to the following for details on:

The tonnage of vessels may be determined in accordance with the Vessel Registration and Tonnage Regulations and TP 13430, either by using the Assigned Formal Tonnage, the Simplified Method or by a duly appointed Tonnage Measurer.

  • For vessels of not more than 12 metres in length, you can choose to use the “Assigned Formal Tonnage” (non-calculated tonnage). Assigned Formal Tonnage simply means linking a tonnage number to the length of the vessel. Should you require an accurate tonnage calculation, use Form 4A or 4B.
    • Not more than 8.5m = gross tonnage of 4.99
    • More than 8.5m but not more than 10.5m = gross tonnage of 9.99
    • More than 10.5m but not more than 12m = gross tonnage of 14.99
  • If the vessel is to be measured using the Simplified Method, this method applies for the following vessels:
    • Monohull vessels up to and including 15 metres tonnage measurement length (TML) - use Form 4A Simplified Method of Tonnage Measurement [PDF version].
    • “Monohull vessel” means a vessel having not more than a single tier of deckhouses and/or superstructures (including breaks that are also being regarded as one tier of superstructures) whose total combined length does not exceed 70% of TML to be measured.
    • Simple multihull vessels up to and including 15 metres tonnage measurement length (TML) - use Form 4B Tonnage Measurement of a Simple Multihull Vessel [PDF version].
    • “Simple multihull vessel” means a flat platform installed on two or more pontoons.
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