Convert wind speed to the Beaufort scale and back.
由 10 米高风速（m/s）映射到蒲福风级（0–12）及名称。
| Item | Formula | Source / Standard |
|---|---|---|
| Beaufort to wind speed | v about 0.836 * B^(3/2) m/s | WMO Beaufort wind force scale |
| Force band lookup | speed bands mapped to Beaufort force 0 to 12 | WMO Beaufort wind force scale |
| Sea state description | wave height and sea state classed by force | WMO sea state code |
Constants and standards used on this page with their authoritative sources, for verification and citation.
| Quantity | Value | Unit | Source |
|---|---|---|---|
| Empirical coefficient 0.836 | 0.836 | m/s (B = force) | Empirical fit to the upper bounds of the Beaufort scale (literature values 0.835-0.836) |
| Original Beaufort scale | Proposed by Francis Beaufort, 1805 | — | Beaufort F. (1805); extended to force 12 by WMO in 1946 |
| Lower bound of force 12 | ≥ 32.7 | m/s | WMO Guide to Marine Meteorological Services (1970) |
| China wind-force standard | GB/T 35227—2017 | — | Specifications for surface meteorological observation: wind direction and speed |
| Typhoon threshold | ≥ 32.7 (force 12) | m/s | GB/T 19201-2006 Grade of tropical cyclones |
Note: the Beaufort scale is defined by wind-speed ranges in WMO and Chinese standards; 0.836·B^(3/2) is only an empirical approximation of the upper bounds. Use the tabulated ranges for authoritative classification.