Full reference chart (m²)
This calculator interpolates from a real printed sail-size reference chart (wind speed vs. rider weight, in square meters), so results are estimates rather than an exact formula, no universal formula for this exists. Actual sail choice also depends on skill level, board volume, sail trim, riding style, and local conditions, so treat this as a starting point rather than a strict rule.
Data source: recreational-level sail size table from the Windsurfing article on Wikipedia, digitized cell by cell.
Newman Darby built an early rudimentary sailboard in Pennsylvania in 1964, but the modern windsurfer - with its universal-joint mast and free-standing sail - was patented in 1970 by aeronautical engineer Jim Drake and businessman Hoyle Schweitzer in California.
The outright windsurfing speed record is 53.49 knots (99 km/h) over 500 metres, set by Antoine Albeau at the Luderitz Speed Challenge in Namibia in December 2024, one of the windiest, flattest speed courses on Earth.
The record for the longest windsurf board belongs to a 35.7-metre giant built by Dutch students, sailed simultaneously by 14 windsurfers on Valkenburg Lake in the Netherlands in 2015.
Björn Dunkerbeck holds a record 42 PWA world championship titles across racing, waves, and freestyle, while Robby Naish, world champion at just 13, became one of the sport's most enduring global ambassadors.