Ship Stability Analysis Calculation Excel Template

Ship stability analysis ensures that a vessel maintains adequate buoyancy, balance, and resistance to capsizing under static and dynamic conditions. Core principles include hydrostatic equilibrium, the relationship between center of gravity (G), center of buoyancy (B), and metacenter (M), and the evaluation of righting lever (GZ) curves across heel angles. The Excel template operationalizes these principles by structuring input sheets for hull form coefficients (e.g., waterplane area, displacement volume, second moment of area), tank calibration data, and load cases (lightship, ballast, full load, damage scenarios). Computationally, it applies numerical integration (e.g., Simpson’s rule) for waterplane properties, iteratively solves for draft and trim using moment equilibrium, and generates GZ values via geometric and hydrostatic interpolation. Validation features—such as cross-checks for displacement consistency, free surface moment correction, and angle-of-loll detection—enhance reliability for both design-phase assessments and operational voyage planning. Regulatory compliance modules often embed threshold checks per SOLAS Chapter II-1 and IMO Intact/Damage Stability Codes, flagging non-conformances in real time.