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.