Beaufort scale
m/s
kts
mph
km/h
ft/min
0 Calm
0 - 0.2
0 - 1
0 - 1
0 - 1
0 - 58
1 Light air
0.3 - 1.5
1 - 3
1 - 3
1 - 5
59 - 314
2 Light breeze
1.6 - 3.3
4 - 6
4 - 7
6 - 11
315 - 668
3 Gentle breeze
3.4 - 5.4
7 - 10
8 - 12
12 - 19
669 - 1082
4 Moderate breeze
5.5 - 7.9
11 - 16
13 - 18
20 - 28
1083 - 1574
5 Fresh breeze
8.0 - 10.7
17 - 21
19 - 24
29 - 38
1575 - 2125
6 Strong breeze
10.8 - 13.8 22 - 27
25 - 31
39 - 49
2126 - 2735
7 High wind,
moderate gale,
near gale
13.9 - 17.1 28 - 33
32 - 38
50 - 61
2736 - 3385
8 Gale, fresh gale
17.2 - 20.7 34 - 40
39 - 46
62 - 74
3386 - 4093
9 Strong/severe
gale
20.8 - 24.4 41 - 47
47 - 54
75 - 88
4094 - 4822
10 Storm, whole gale 24.5 - 28.4 48 - 55
55 - 63
89 - 102
4823 - 5609
11 Violent storm
28.5 - 32.6 56 - 63
64 - 72
103 - 117
5610 - 6417
12 Hurricane force
32.6
>63
>72
>117
>6417
26
