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Wetted Surface Area Calculator

Wetted Surface Area Calculator

The wetted surface area calculator will apply to most motor cruisers and sailing boats.

Calculate the area and select the water type from the tables to obtain the required number of hull anodes.

Measurements required:

Water line length = LWL
Beam = B
Draft = D
LWL x (B + D) = wetted surface area in meters squared

As an example, the table below shows the number and type of anodes required for 2 years per water type for a steel hulled boat. Ideally, you should check the voltage readings for your vessel to ensure it’s in the range recommended for the hull type.

Area (meter squared)Fixing TypeSaltSaltSalt/Brackish WaterSalt/Brackish WaterFresh WaterFresh Water
  HullRudderHullRudderHullRudder
Up to 28Stud/Bolt4 x 00271E2 x 00105UK4 x 00271EAL2 x 00105UKAL4 x 00271EMG2 x 00102UKMG
Up to 28Weld4 x 003062 x 003514 x 00306AL2 x 00351AL  
28.1 - 56Stud/Bolt8 x 00271E2 x 00105UK8 x 00271EAL2 x 00105ukal4 x 003092 x 00102UKMG
28.1 - 56Weld4 x 003062 x 003514 x 00306AL2 x 00351AL  
56.1 - 84Stud/Bolt4 x 00271E2 x 00105UK4 x 00272EAL2 x 00102UKAL6 x 00310MG2 x 00351/2/BMG
56.1 - 84Weld6 x 003092 x 003514 x 00309AL2 x 00351AL  
84.1 - 102Stud/Bolt2 x 000271E2 x 00105UK8 x 00271EAL2 x 00102UKAL  
84.1 - 102Weld6 x 003092 x 003066 x 00309AL2 x 00351AL  
102.1 - 148Stud/Bolt8 x 00271E2 x 00105UK    
102.1 - 148Weld8 x 003092 x 00306    

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