Knots to MPH Conversion Chart

5 Knots = 5.8 MPH
10 Knots = 11.5 MPH
15 Knots = 17.3 MPH
20 Knots = 23.0 MPH
25 Knots = 28.8 MPH
30 Knots = 34.6 MPH
35 Knots = 40.3 MPH
40 Knots = 46.1 MPH
45 Knots = 51.8 MPH
50 Knots = 57.6 MPH
55 Knots = 63.4 MPH
60 Knots = 69.1 MPH
65 Knots = 74.9 MPH
70 Knots = 80.6 MPH
75 Knots = 86.4 MPH
80 Knots = 92.2 MPH
85 Knots = 97.9 MPH
90 Knots = 103.7 MPH
95 Knots = 109.4 MPH
100 Knots = 115.2 MPH
105 Knots = 121.0 MPH
110 Knots = 126.7 MPH
115 Knots = 132.5 MPH
120 Knots = 138.2 MPH
125 Knots = 144.0 MPH
130 Knots = 149.8 MPH
135 Knots = 155.5 MPH
140 Knots = 161.3 MPH
145 Knots = 167.0 MPH
150 Knots = 172.8 MPH
Beaufort Wind Scale

Beaufort Scale
Speed MPH
Description
0
below 1
Calm: smoke rises vertically
1
1-3
Light Air: Smoke drifts; leaves barely move
2
4-7
Light Breeze: Leaves rustle; wind can be felt
3
8-12
Gentle Breeze: Leaves and twigs move; debris and dust raised from ground
4
13 -18
Moderate Breeze: Small branches move; debris and dust raised from ground
5
19 - 24
Fresh Breeze: Small trees sway and large branches in motion; dust clouds raised
6
25 - 31
Strong Breeze: Large branches continuously move; wind whistles; difficulty using and umbrella
7
32 - 38
Moderate Gale: Large trees sway; difficulty walking
8
39 - 46
Fresh Gale: Twigs and small branches break; walking very difficult
9
47 - 54
Strong Gale: Slight damage to buildings; shingles blow off roof
10
55 - 63
Whole Gale: Large trees uprooted; heavy damage to buildings
11
64 - 72
Storm: Widespread damage
12
above 73
Hurricane: Severe damage and destruction