Wind force and sea state reference. Enter wind speed to find the Beaufort force.
Beaufort Force
—
Wave Height—
Description—
Force
Name
Speed (kts)
Wave Ht
Description
State
Description
Wave Height
0
Calm (glassy)
0 m
1
Calm (rippled)
0–0.1 m
2
Smooth (wavelets)
0.1–0.5 m
3
Slight
0.5–1.25 m
4
Moderate
1.25–2.5 m
5
Rough
2.5–4.0 m
6
Very Rough
4.0–6.0 m
7
High
6.0–9.0 m
8
Very High
9.0–14.0 m
9
Phenomenal
>14.0 m
Beaufort scale wind speed ranges are averages. Gusts may exceed these values. Douglas scale describes sea state independent of swell from distant storms.