1. What is Gross Tonnage?

Gross Tonnage (GT) is a dimensionless index calculated from the total enclosed volume of a ship. It represents the overall size of a vessel and is used for regulations, safety rules, and port dues.

2. How Does the Calculator Work?

The calculator uses the Gross Tonnage formula:

Where:

• \( V \) — Total enclosed volume in cubic meters (m³)

Explanation: The formula calculates gross tonnage based on the logarithmic relationship between volume and tonnage measurement.

3. Importance of Gross Tonnage Calculation

Details: Gross Tonnage is crucial for ship classification, determining port fees, safety regulations, and international maritime conventions. It provides a standardized measure of ship size.

4. Using the Calculator

Tips: Enter the total enclosed volume in cubic meters. The value must be greater than 0 for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between Gross Tonnage and Net Tonnage?
A: Gross Tonnage represents the total enclosed volume of the ship, while Net Tonnage deducts non-revenue producing spaces and represents the earning capacity.

Q2: Is Gross Tonnage the same as weight?
A: No, Gross Tonnage is a measure of volume, not weight. One gross ton equals 100 cubic feet (2.83 m³) of enclosed space.

Q3: Why use a logarithmic formula for tonnage calculation?
A: The logarithmic relationship accounts for the fact that larger ships have relatively less tonnage per unit volume than smaller ships.

Q4: What are typical GT values for different ship types?
A: Small boats: 1-10 GT, Medium ships: 100-10,000 GT, Large vessels: 10,000-200,000+ GT (e.g., container ships, tankers).

Q5: Are there international standards for GT calculation?
A: Yes, the International Convention on Tonnage Measurement of Ships (1969) established uniform rules for GT calculation worldwide.