Windsurfing Calculator

Estimate the sail size for your weight and the wind.

Recommended sail size 6

Formula: size ≈ 6 × (20 ÷ wind) × (weight ÷ 75)

Step-by-step with your numbers:

1. Values used:

2. Sailor weight = 75

3. Wind speed = 20 kn

5. Recommended sail size = 6

Did we solve your problem today?

Windsurf sail size depends on your weight and the available wind.

The math behind it

A 75 kg sailor uses roughly a 6 m² sail in 20 knots, scaling with weight and inversely with wind.

75 kg in 20 knots → about 6 m².

Light wind, bigger sail?

Yes — lighter wind needs more sail area to power up.