Ship Tonnage Calculator (GT & NT) | Ship Calculator Suite

Ship Tonnage Calculator (GT/NT)

Calculate Gross Tonnage (GT) and Net Tonnage (NT) based on the 1969 Tonnage Convention.

Input Parameters

Enter the required ship particulars. All volumes in m³, dimensions in meters.

For Gross Tonnage (GT)

Total Volume of Enclosed Spaces (V)

m³

For Net Tonnage (NT)

NT calculation requires a valid GT and the parameters below.

Total Volume of Cargo Spaces (Vc)

m³

Moulded Depth Amidships (D)

Moulded Draught Amidships (d)

Passengers (N1)

count

Passengers (N2)

count

**Note:** This calculator is based on the International Convention on Tonnage Measurement of Ships, 1969. Ensure input values are correct as per vessel's official documentation. For official certification, always refer to classifications societies and authorized bodies.