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FWA and DWA Calculator

Calculate Fresh Water Allowance and Dock Water Allowance for any vessel, supporting TPC and TPI inputs with dock water density presets.

FWA & DWA Calculator

FWA formula: FWA in mm equals Summer Displacement divided by 4 times TPC. DWA formula: DWA equals FWA times (1025 minus Dock Water Density) divided by 25, consistent with IMO load line convention where 1025 kg per cu m is standard seawater.
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