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gross tonnage
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gross tonnage

shipping
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In shipping, tonnage refers to the total number of tons registered, carried, or the total carrying capacity of a vessel. Gross tonnage (GT) is a volume-based measurement used for calculating harbor and canal dues for merchant ships. It is calculated using the formula (GT = K_1 V), where (V) is the enclosed volume in cubic meters and (K_1) is a constant derived from (V). Deadweight tonnage (DWT), on the other hand, measures the total cargo, fuel, and supplies a ship can carry, expressed in long tons. Displacement tonnage is used for naval ships and indicates the weight of water they displace. Tankers, a type of ship, are designed to carry liquid cargo in bulk and vary greatly in size, from small coastal vessels to massive supertankers like ULCCs and VLCCs.12

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