Beaufort wind scale
The full 0–17 Beaufort scale: enter a wind speed to get the level, speeds in m/s, km/h, mph and knots, the band, land effects and the Chinese tropical-cyclone classification.
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Result
Beaufort level, four speed units, the band, land effects and the cyclone grade, plus the full 0–17 table.
Enter a wind speed to classify
Level: 0
What this tool does
- Translate typhoon forecasts: 33 m/s is Beaufort 12, a full hurricane.
- Judge outdoor work and flight conditions from the land-effect description — force 8 breaks twigs, force 9 dislodges tiles.
- Convert marine and aviation knots: 30 kn ≈ 15.4 m/s, close to force 7.
Example
Input
120
Output
33.333333 m/s 属于 12 级（飓风），区间 32.7–36.9 m/s 蒲福风级 = 12 级（飓风） 风速（m/s） = 33.333333 m/s 风速（km/h） = 120 km/h 风速（mph） = 74.564543 mph 风速（节） = 64.794816 kn 本级风速区间 = 32.7–36.9 m/s 陆上现象 = 摧毁性破坏，海面狂风巨浪 热带气旋分级 = 台风（32.7–41.4 m/s） 0 级 无风：0–0.2 m/s，烟直上，海面平静如镜 1 级 软风：0.3–1.5 m/s，烟能表示风向，但风向标不动 2 级 轻风：1.6–3.3 m/s，人面感觉有风，树叶微响 3 级 微风：3.4–5.4 m/s，树叶与旗子摆动，纸张翻动 4 级 和风：5.5–7.9 m/s，能吹起地面纸张与灰尘，小树枝摇动 5 级 清风：8–10.7 m/s，小树摇摆，内陆水面有小波 6 级 强风：10.8–13.8 m/s，大树枝摇动，举伞困难 7 级 疾风：13.9–17.1 m/s，全树摇动，迎风步行不便 8 级 大风：17.2–20.7 m/s，小树枝折断，前行阻力明显 9 级 烈风：20.8–24.4 m/s，屋瓦被吹动，烟囱受损 10 级 狂风：24.5–28.4 m/s，树木连根拔起，建筑物受损 11 级 暴风：28.5–32.6 m/s，大范围破坏，陆上极少见 12 级 飓风：32.7–36.9 m/s，摧毁性破坏，海面狂风巨浪 13 级 飓风（13 级）：37–41.4 m/s，台风核心区，陆上极罕见 14 级 飓风（14 级）：41.5–46.1 m/s，强台风级，严重摧毁 15 级 飓风（15 级）：46.2–50.9 m/s，强台风级，严重摧毁 16 级 飓风（16 级）：51–56 m/s，超强台风级，灾难性破坏 17 级 飓风（17 级及以上）：56.1–61.2 m/s，超强台风级，灾难性破坏 风速与等级来自扩展蒲福风级；热带气旋分级按 GB/T 19201，同一风速在不同机构（CMA / JTWC / NHC）的分级名称可能不同。
33 m/s is Beaufort 12 (hurricane), the 32.7–36.9 m/s band, and “typhoon” on the Chinese cyclone scale.
Frequently asked questions
How many Beaufort levels are there?
The classic scale runs 0–12, while Chinese meteorological and marine practice extends it to 0–17. Force 0 is 0–0.2 m/s, force 12 is 32.7–36.9 m/s and force 17 covers 56.1–61.2 m/s.
Is wind speed linear with the level?
No. Beaufort levels are discrete bands tied to observed effects, and the bands widen with the wind: force 12 to 13 spans 4.5 m/s while force 1 to 2 spans only 1.3 m/s.
Is the cyclone classification the same as Beaufort?
No. The Chinese tropical-cyclone scale (GB/T 19201) splits cyclones into tropical depression, tropical storm, severe tropical storm, typhoon, severe typhoon and super typhoon by maximum wind speed, and thresholds differ between CMA, JTWC and NHC.
How do knots convert?
One knot is one nautical mile per hour: 1852 ÷ 3600 ≈ 0.514444 m/s, so 1 m/s ≈ 1.943844 knots.
Keywords：风力等级蒲福风级风速换算台风分级beaufort scale几级风节转米每秒风速判级