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01
Definitions #
A ship's usable cargo capacity, calculated from the gross tonnage after deducting spaces for crew, engines, and other non-cargo areas.
Technical The statutory volume measurement (GT - non-cargo spaces) that determines port dues, canal tolls, and tonnage tax liability.
Example The vessel's net tonnage of 12,000 tons will be used for the port maintenance fee calculation.
02
Etymology #
From net meaning 'after deductions', from Old French net, plus tonnage from ton denoting cargo capacity.
03
Collocations #
- net tonnage certificate 船舶净吨位证书
- net tonnage dues 按净吨计算港口费
- net tonnage measurement 净吨测量
04
Real Business Examples #
- The net tonnage certificate is required for the ship's registration documents.
- The port authority calculates the anchorage fee based on the net tonnage of the vessel.
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05
Register & Variants #
- Register: formal
- BrE/AmE: 全球通用，国际海事组织标准
06
Synonyms & Antonyms #
- Synonyms: net registered tonnage
- Antonyms: gross tonnage
07
Common Errors #
- 混淆净吨与载重吨 净吨是容积单位（扣除非货舱），载重吨（deadweight）是重量单位，衡量最多可载货重量。
- 误用净吨计算货物载重 净吨用于港口费用和运河费，货物载重由载重吨或舱容决定，不可直接互换。
08
Confusable Terms #
- Gross Tonnage vs Net Tonnage
- 总吨是内部总容积，净吨是在总吨基础上扣除非货运空间后的容积；净吨总是小于总吨。
09
Frequently Asked Questions
净吨怎么计算？?
净吨按国际吨位丈量公约，从总吨中扣除机舱、船员舱等非货舱容积，公式各国法规有细微差异。
港口费为什么用净吨而不是总吨？?
净吨反映船舶可用于商业载货的空间，更合理体现对港口设施的使用量；总吨还包括非商业空间。
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Published: 2026-10-04 Category: Shipping