Tonnage Calculator

Guide to Using the Tonnage Calculator

Welcome to the Tonnage Calculator, a tool designed to help you compute various tonnage-related metrics for different types of vessels. Below is a step-by-step guide on how to make the most out of this calculator.

Step 1: Input Vessel Dimensions

• Vessel Length (meters): Enter the length of your vessel in meters. Ensure that the value is between 1 and 500 meters.
• Vessel Breadth (meters): Enter the breadth (width) of the vessel in meters. The acceptable range is from 1 to 100 meters.
• Vessel Depth (meters): Provide the depth (height) of your vessel in meters. It must be between 1 and 50 meters.

All these fields are mandatory, and the calculator will not proceed without valid inputs for each. Ensure the numbers are within the specified limits.

Step 2: Input the Block Coefficient

The Block Coefficient is crucial for accurate calculations, representing the blockiness of the vessel. Enter a value between 0.1 and 1.0. This value reflects how full-bodied the ship is, with 0.1 being very slender and 1.0 being completely full, and it should be entered with a precision of two decimal places.

Step 3: Select Vessel Type

Select the vessel type that best represents your ship. This influences the calculations:

• Cargo Ship: Value 1.0
• Passenger Ship: Value 0.85
• Tanker: Value 0.95
• Container Ship: Value 0.9

This selection is also mandatory, as it impacts the gross tonnage calculation.

Step 4: Understand the Results

Once all inputs are provided, the calculator will compute and display the following results:

• Gross Tonnage: This metric is derived using the formula: 0.2 + 0.02 * log(length * breadth * depth * vesselType * blockCoefficient). It provides an indication of the overall internal volume of the vessel, formatted to two decimal places and expressed in GT (Gross Tonnage).
• Net Tonnage: Calculated as grossTonnage * 0.6, this measures the volume of cargo space within the vessel, presented in NT (Net Tonnage).
• Displacement: This indicates the vessel’s weight when fully loaded, calculated by length * breadth * depth * blockCoefficient * 1.025, expressed in tonnes.
• Deadweight Tonnage: Using the formula displacement * 0.85, this metric shows the total weight a vessel can carry including cargo, crew, and supplies, shown in DWT (Deadweight Tonnage).

Each of these results is presented in a formatted manner, ensuring clarity and precision.

Conclusion

Using the Tonnage Calculator is a straightforward process if all inputs are correctly provided within the outlined limits. This tool assists in ensuring accurate and efficient calculation of tonnage metrics crucial for vessel operation and compliance. We hope you find this guide helpful in utilizing the full potential of the calculator.