Keel Sizing Calculator

Calculate keel area, draft, and ballast ratio for sailboat stability

Input Parameters

Results

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Keel Area
ft²
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Keel Aspect Ratio
--
Ballast Weight
lb
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Ballast Ratio
%

Reference

Keel Area = LWL × Draft × factor Aspect Ratio = Draft² / Area Ballast Ratio: cruiser 35-45%, racer 45-55%