Wind Speed Conversion Table
BF m/s KT km/h
0 <0.4 <1 <1
1 0.4-1.5 1-3 1-5
2 1.6-3.3 4-6 6-12
3 3.4-5.4 7-10 12-19
4 5.5-7.9 11-16 20-29
5 8.0-10.7 17-21 29-39
6 10.8-13.8 22-27 39-50
7 13.9-17.1 28-33 50-62
8 17.2-20.7 34-40 62-75
9 20.8-24.4 41-47 75-88
10 24.5-28.4 48-55 88-102
11 28.5-32.6 56-63 103-117
12 32.7-36.9 64-71 118-133