Tonnage (GT/NT) Calculator
Calculate gross tonnage and net tonnage from enclosed volume using the ITC 69 convention.
Inputs
ft³
ft³
ft
ft
Results
Gross Tonnage (GT)
181.94
Net Tonnage (NT)
84.76
GT/NT Ratio2.15
Volume (m³)707.9 m³
How to Use This Calculator
- Enter the total enclosed volume (all enclosed spaces) and cargo space volume in cubic feet.
- Input the molded draft and molded depth in feet, and the number of passenger berths.
- Review the Gross Tonnage (GT) and Net Tonnage (NT) computed per ITC 69 convention.
- GT determines port fees, safety equipment requirements, and crew manning rules.
- NT affects canal dues and fishing licenses — consult a surveyor for official certification.
Ad Placeholder
Related Calculators
Vessel Displacement Calculator
Calculate vessel displacement from hull dimensions, draft, and block coefficient.
Freeboard Calculator
Calculate minimum freeboard from load line regulations and compare against actual freeboard.
Marine Tank Capacity Calculator
Calculate fuel, water, and holding tank volumes and weights for marine applications.
Deck Load Calculator
Calculate maximum deck loading capacity from structural scantlings, plating thickness, and frame spacing.
Ad Placeholder