// multi-utility computation suite · offline · instant · precise
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sport.sailing-boat-speed Calculator
Calculates theoretical hull speed from waterline length, apparent wind speed, and wind angle to determine whether a boat is sailing at its optimum. Monohulls approaching hull speed are at maximum efficiency; exceeding it requires planing hulls.
Inputs
Wind Speed Kts
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Boat Length M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Sail Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Displacement Kg
Net position change from start to end — a vector. Different from distance, which is the total path length.
Results
hull speed (knots)
The computed rate of movement or processing.
SA/D ratio
The proportional relationship between two quantities.