1. What is Gross Tonnage?

Definition: Gross tonnage (GT) is a unitless index related to a vessel's overall internal volume, calculated using the vessel's total enclosed volume and a multiplier.

Purpose: It's used to determine things like manning regulations, safety rules, and registration fees for ships.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( GT \) — Gross tonnage (unitless)
• \( K \) — Coefficient (typically 0.2–0.3)
• \( V \) — Total enclosed volume (cubic meters)

Explanation: The coefficient accounts for the vessel type and configuration, while the volume represents all enclosed spaces.

3. Importance of Gross Tonnage

Details: GT is crucial for ship classification, safety regulations, port fees, and determining crew requirements under international conventions.

4. Using the Calculator

Tips: Enter the coefficient (default 0.2) and total enclosed volume in cubic meters. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between gross tonnage and deadweight tonnage?
A: Gross tonnage measures volume capacity, while deadweight tonnage measures weight-carrying capacity.

Q2: How do I determine the coefficient (K)?
A: For most vessels, 0.2 is standard. Passenger ships might use 0.3-0.35. Consult IMO regulations for specifics.

Q3: What's included in the volume calculation?
A: All enclosed spaces of the ship, including cargo holds, engine rooms, and superstructure.

Q4: Is this the same as net tonnage?
A: No, net tonnage excludes non-cargo spaces like engine rooms and crew quarters.

Q5: Why is tonnage unitless?
A: It's an index number rather than an actual measurement of weight or volume.