SEA TOOLS

Quick Calcs

Trim, draft survey & load line

How to use

Set up My Ship once (paste hydrostatics, holds, tanks from your booklet).
Work through loading in order: plan cargo, check load line, trim to finish, then survey.
Soundings feed Draft Survey deductibles; export or print trim and survey worksheets.

Example values — edit any field.

Reference worksheets only. Verify every result against your ship's approved loading computer, stability booklet, and company procedures.

Linear interpolation

Interpolated29.20

Stowage factor (ft³/LT)

m³/t1.282

Bilinear (report case)58900

Density / draft change

Displacement (t)TPC (t/cm)From density (kg/m³)To density (kg/m³)

FWA285.7 mm

Δdraft at "to" density (FWA method)171.4 mm

Mean draft change (ρ from → to)0.171 m

Hand calc: Δdraft (mm) = FWA × (1025 − ρ) / 25; or FWA × (1.025 − ρ) / 0.025 with ρ in t/m³. Example: FWA 285.7 mm at ρ 1010 → 171.4 mm deeper.