Rudder Area Calculator
Calculate minimum rudder area and dimensions from lateral plane area and desired percentage.
Inputs
ft²
%
Results
Rudder Area
4.8 ft²
Rudder Area (metric)0.45 m²
Rudder Span3.1 ft
Rudder Chord1.55 ft
How to Use This Calculator
- Enter the lateral plane area (LPA) of the hull in square feet — typically from design drawings.
- Set the rudder area percentage (typically 1.5-2.5% of LPA) and desired aspect ratio.
- Review the recommended rudder area in sq ft and m².
- Check the rudder span and chord dimensions to guide fabrication.
- Increase the percentage if greater maneuverability is needed for tight-harbor operations.
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