1. What is a Sailboat Gross Tonnage Calculator?

Definition: This calculator estimates the gross tonnage (GT) of a sailboat based on its volume and a coefficient.

Purpose: It helps boat owners, designers, and maritime professionals determine a vessel's gross tonnage for registration, regulations, and classification purposes.

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 gross tonnage is calculated by multiplying the vessel's total enclosed volume by a coefficient that accounts for the vessel's type and configuration.

3. Importance of Gross Tonnage Calculation

Details: Gross tonnage is used for vessel registration, determining manning requirements, safety regulations, port fees, and taxation.

4. Using the Calculator

Tips: Enter the coefficient (typically 0.25 for sailboats) between 0.2-0.3 and the total enclosed volume in cubic meters. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between gross tonnage and displacement?
A: Gross tonnage measures enclosed volume (for regulatory purposes) while displacement measures actual weight of water displaced.

Q2: Why does the coefficient vary?
A: The coefficient accounts for different vessel types and configurations (e.g., 0.2 for spartan sailboats, 0.3 for luxury yachts).

Q3: How do I measure the enclosed volume?
A: Calculate using length × beam × draft × block coefficient, or consult naval architecture plans.

Q4: Is this the same as net tonnage?
A: No, net tonnage deducts non-cargo spaces and is typically about 30% less than gross tonnage.

Q5: What's a typical GT range for sailboats?
A: Small sailboats (5-15 GT), mid-size cruisers (15-30 GT), large yachts (30-100 GT).