What is metacentric height (GM)?

GM is the distance between the center of gravity and metacenter.

Ship GM Calculator - Vessel Stability & Metacentric Height Tool

Ship Stability (GM) Calculator

Calculate the final Metacentric Height (GM) after loading or discharging weights.

Initial Conditions

Initial Displacement

Tonnes

Initial KG

Initial KM

Loading / Discharging Operations

Operation 1

Action

Weight (Tonnes)

KG of Weight (m)

Final Condition Input

Enter the final KM value from the ship's hydrostatic tables for the new final displacement of ... Tonnes.

Final KM

**Note:** This calculator provides a stability estimation. KG refers to the Vertical Center of Gravity from the keel. KM is the height of the Metacenter above the keel. The final KM value must be accurately obtained from the vessel's official hydrostatic tables based on the final displacement. This tool does not account for Free Surface Moments (FSM). Always consult the ship's approved loading computer and stability booklet for official calculations.