Draft Change from Density Change

Mean-draft change when entering water of different density - the core FWA / DWA relation, scaled for any density delta.

DraftDensityFWA

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\Delta T = \frac{\Delta \cdot (\rho_0 - \rho_1)}{\rho_1 \cdot TPC}

Symbol	Meaning	Unit
$\rho_0, \rho_1$	Departure / arrival water density	kg/m³
$\Delta$	Displacement	t
$TPC$	Tonnes per cm at current draft	t/cm

Source: Kemp & Young - Ship Stability

Mean-draft change when entering water of different density - the core FWA / DWA relation, scaled for any density delta.