HomeCalculatorsMetacentric Height (GM)

Metacentric Height (GM)

Initial transverse metacentric height GM = KM − KG - the single most-cited stability criterion.

StabilityGM

Geometry

KM (transverse metacentre above keel)mFrom hydrostatic tables at current draft.KG (vertical centre of gravity above keel)mFrom loading computer after cargo + ballast + consumables.

Free-surface correction

Total free-surface correctionmSum of i·ρ / Δ across all slack tanks. Zero if all tanks are pressed up or empty.

Solid GM

1.300m

Fluid GM

1.220m

IS Code minimum met (≥ 0.15 m)

Formula, assumptions, and limits

Fluid GM is the value that stability criteria must be compared against (IS Code requires ≥ 0.15 m). Solid GM is meaningful only when no tanks are slack.