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Calcimator

Stability GZ Curve Calculator

Calculate the righting arm (GZ) curve from hull geometry and loading to assess vessel stability.

Inputs

ft
ft
LT
ft
ft

Results

Metacentric Height (GM)

1.55 ft

Maximum GZ

320,051,254,573,628,540,000,000,000,000,000 ft

Angle of Max GZ90°
Vanishing Angle90°
KB (Center of Buoyancy)2.65 ft
BM (Metacentric Radius)2.4 ft
Max Righting Moment4,800,768,818,604,428,000,000,000,000,000,000 ft·LT
How to Use This Calculator
  1. Enter the hull beam and draft in feet, displacement in long tons, and KG (height of center of gravity).
  2. Optionally override GM if you have a measured metacentric height value.
  3. Review the metacentric height (GM) — positive GM indicates initial stability.
  4. Check maximum GZ (righting arm in feet) and the angle at which it occurs.
  5. Verify the vanishing angle exceeds 60° for adequate overall stability range.
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