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Gross Tonnage Formula:
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Boat tonnage refers to the volume or carrying capacity of a vessel, typically measured in tons. Gross tonnage represents the total internal volume of a ship, where one ton equals 100 cubic feet of capacity.
The calculator uses the simplified gross tonnage formula:
Where:
Explanation: This formula provides a simplified calculation of a vessel's gross tonnage based on its principal dimensions, where 0.5 represents a shape factor approximation.
Details: Tonnage calculation is crucial for vessel registration, regulatory compliance, safety standards, port fees determination, and insurance purposes. It helps classify vessels and determine their operational limitations.
Tips: Enter the boat's length, breadth, and depth in feet. All values must be positive numbers. For accurate results, measure the boat's dimensions carefully at their maximum points.
Q1: What's the difference between gross tonnage and displacement tonnage?
A: Gross tonnage measures internal volume (100 cubic feet per ton), while displacement tonnage measures the actual weight of water displaced by the vessel.
Q2: Is this formula applicable to all types of boats?
A: This simplified formula works best for standard hull shapes. Complex hull designs may require more detailed calculations or professional measurement.
Q3: How accurate is this calculation method?
A: This provides a reasonable estimate for general purposes, but official tonnage measurements for registration typically require more precise methods.
Q4: Why is tonnage important for boat owners?
A: Tonnage affects registration fees, safety equipment requirements, crew requirements, and determines which waterways and ports a vessel can access.
Q5: Can I use metric measurements instead of feet?
A: The formula is designed for feet measurements. For metric inputs, you would need to convert the formula or convert your measurements to feet first.