Windsurfing Calculator
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Reviewed by Sher, Sports Science & Nutrition Specialist
Reviewed by Sher, Sports Science & Nutrition Specialist
Formula
Sail Size (m²) ≈ Rider Weight(kg) / (Wind Speed(knots) × 1.5)
Heavier riders need more sail area. Higher wind = smaller sail. This is a starting estimate — also consider skill level and board volume.
Worked Examples
Example 1: 75kg rider, 15 knots
Problem:75kg, 15 knots
Solution:75/(15×1.5) = 3.3 → use ~5.5-6.5 m² with a comfortable margin
Result:~5.5-6.5 m² sail
Example 2: 90kg rider, strong 25-knot wind
Problem:90kg, 25 knots
Solution:90/(25×1.5) = 2.4 → use ~4.0-4.5 m² performance sail
Result:~4.0-4.5 m² sail
References
Reviewed by Sher, Sports Science & Nutrition Specialist · Editorial policy