Free Tool
Ship Stability Calculator
KG after loading or discharging, free-surface correction, corrected GM — checked against the IMO minimum.
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Use your own verified particulars. Profiles are downloaded to or selected from your device; they are not uploaded to Maritime GPT.
KG shifts by moments; GM corrected for free surface via i·ρ/Δ. IMO Res. A.749(18) minimum GM ≥ 0.15 m checked — the full area criteria (0.055/0.09 m·rad, GZmax ≥ 0.2 m at ≥30°) need the ship's GZ curve and approved loading instrument. Screening only.
Scope
Moment arithmetic — with its limits stated.
Moments
New KG = (Δ·KG ± w·kg)/(Δ ± w). Free-surface correction = i·ρ/Δ per slack tank.
A.749(18) floor
GM ≥ 0.15 m is checked. The full intact criteria need the GZ curve — beyond a simple calculator.
Not loading software
Real loading decisions run on the approved stability booklet and loading computer. Screening only.
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