1. What is USCG Gross Tonnage?

Gross Tonnage (GT) is a measure of a vessel's total internal volume, calculated according to US Coast Guard (USCG) regulations. It's used for documentation, safety regulations, and determining vessel fees.

2. How Does the Calculator Work?

The calculator uses the USCG simplified formula:

Where:

• \( L_{ft} \) — Length of the vessel (feet)
• \( B_{ft} \) — Beam (width) of the vessel (feet)
• \( D_{ft} \) — Depth of the vessel (feet)
• 0.67 — Standardized coefficient

Explanation: The formula approximates the vessel's total enclosed volume and converts it to gross tons (1 gross ton = 100 cubic feet).

3. Importance of Gross Tonnage Calculation

Details: Gross Tonnage determines vessel documentation requirements, safety equipment needed, crew requirements, and applicable regulations. It's also used for registration fees and taxes.

4. Using the Calculator

Tips: Enter vessel dimensions in feet. Length is from stem to stern, beam is maximum width, and depth is from top of hull to bottom of keel. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Is this the same as displacement tonnage?
A: No, gross tonnage measures volume while displacement tonnage measures weight of water displaced by the vessel.

Q2: What's the difference between GT and NT?
A: Gross Tonnage (GT) includes all spaces, while Net Tonnage (NT) deducts non-cargo spaces.

Q3: How accurate is this simplified formula?
A: It provides a reasonable estimate but for official documentation, more precise measurements may be required.

Q4: Does GT affect vessel registration?
A: Yes, documentation requirements and fees are often based on gross tonnage.

Q5: Can I use this for international vessels?
A: International tonnage measurement (ITC) may use different formulas - check specific regulations.