The knot, a unit of speed equal to one nautical mile per hour, has its origins in the age of sail. Mariners used a device known as the “common log” to measure a ship’s speed. This involved a wooden log attached to a rope with knots tied at uniform intervals. By counting the knots that passed through a sailor’s hands over a set period, they could determine the ship’s speed. Today, knots remain an essential measure in aviation and maritime contexts, underscoring how deeply it is embedded in navigation traditions.
Interestingly, the nautical mile, corresponding to one minute of latitude, is roughly 1.1508 miles. This makes the knot not only a unique unit for speed but also a reminder of the Earth’s curvature and ancient navigation skills.
Kilometres per hour (km/h) is a widely used metric unit of speed, especially on roads and highways around the world. Interestingly, despite its global prevalence, the U.S. primarily uses miles per hour. However, km/h is the standard for most countries, offering a glimpse into global unity as it’s part of the International System of Units (SI). The history of speed limits tied to km/h is quite fascinating. The first speed limit laws, introduced in the United Kingdom in the 19th century, regulated horse-drawn carriages, long before motor vehicles were common. Today, km/h aids not only in measuring speed but also in showcasing technological advancements in transportation engineering as speeds increase with improved vehicle designs.
Knots | Kilometres per hour |
---|---|
0
knot
|
0
km/h
|
1
knot
|
1.852
km/h
|
2
knot
|
3.704
km/h
|
3
knot
|
5.556
km/h
|
4
knot
|
7.408
km/h
|
5
knot
|
9.26
km/h
|
6
knot
|
11.112
km/h
|
7
knot
|
12.96399
km/h
|
8
knot
|
14.81599
km/h
|
9
knot
|
16.66799
km/h
|
10
knot
|
18.52
km/h
|
11
knot
|
20.37199
km/h
|
12
knot
|
22.22399
km/h
|
13
knot
|
24.07599
km/h
|
14
knot
|
25.92799
km/h
|
15
knot
|
27.77999
km/h
|
16
knot
|
29.63199
km/h
|
17
knot
|
31.48399
km/h
|
18
knot
|
33.33599
km/h
|
19
knot
|
35.18799
km/h
|
20
knot
|
37.03999
km/h
|
21
knot
|
38.89198
km/h
|
22
knot
|
40.74398
km/h
|
23
knot
|
42.59598
km/h
|
24
knot
|
44.44798
km/h
|
25
knot
|
46.3
km/h
|
26
knot
|
48.15198
km/h
|
27
knot
|
50.00398
km/h
|
28
knot
|
51.85598
km/h
|
29
knot
|
53.70798
km/h
|
30
knot
|
55.55998
km/h
|
31
knot
|
57.41198
km/h
|
32
knot
|
59.26398
km/h
|
33
knot
|
61.11598
km/h
|
34
knot
|
62.96798
km/h
|
35
knot
|
64.81997
km/h
|
36
knot
|
66.67197
km/h
|
37
knot
|
68.52397
km/h
|
38
knot
|
70.37597
km/h
|
39
knot
|
72.22797
km/h
|
40
knot
|
74.07997
km/h
|
41
knot
|
75.93197
km/h
|
42
knot
|
77.78397
km/h
|
43
knot
|
79.63597
km/h
|
44
knot
|
81.48797
km/h
|
45
knot
|
83.33997
km/h
|
46
knot
|
85.19197
km/h
|
47
knot
|
87.04397
km/h
|
48
knot
|
88.89597
km/h
|
49
knot
|
90.74796
km/h
|
50
knot
|
92.6
km/h
|
51
knot
|
94.45196
km/h
|
52
knot
|
96.30396
km/h
|
53
knot
|
98.15596
km/h
|
54
knot
|
100.00796
km/h
|
55
knot
|
101.85996
km/h
|
56
knot
|
103.71196
km/h
|
57
knot
|
105.56396
km/h
|
58
knot
|
107.41596
km/h
|
59
knot
|
109.26796
km/h
|
60
knot
|
111.11996
km/h
|
61
knot
|
112.97196
km/h
|
62
knot
|
114.82396
km/h
|
63
knot
|
116.67595
km/h
|
64
knot
|
118.52795
km/h
|
65
knot
|
120.37995
km/h
|
66
knot
|
122.23195
km/h
|
67
knot
|
124.08395
km/h
|
68
knot
|
125.93595
km/h
|
69
knot
|
127.78795
km/h
|
70
knot
|
129.63995
km/h
|
71
knot
|
131.49195
km/h
|
72
knot
|
133.34395
km/h
|
73
knot
|
135.19595
km/h
|
74
knot
|
137.04795
km/h
|
75
knot
|
138.9
km/h
|
76
knot
|
140.75195
km/h
|
77
knot
|
142.60394
km/h
|
78
knot
|
144.45594
km/h
|
79
knot
|
146.30794
km/h
|
80
knot
|
148.15994
km/h
|
81
knot
|
150.01194
km/h
|
82
knot
|
151.86394
km/h
|
83
knot
|
153.71594
km/h
|
84
knot
|
155.56794
km/h
|
85
knot
|
157.41994
km/h
|
86
knot
|
159.27194
km/h
|
87
knot
|
161.12394
km/h
|
88
knot
|
162.97594
km/h
|
89
knot
|
164.82794
km/h
|
90
knot
|
166.67994
km/h
|
91
knot
|
168.53193
km/h
|
92
knot
|
170.38393
km/h
|
93
knot
|
172.23593
km/h
|
94
knot
|
174.08793
km/h
|
95
knot
|
175.93993
km/h
|
96
knot
|
177.79193
km/h
|
97
knot
|
179.64393
km/h
|
98
knot
|
181.49593
km/h
|
99
knot
|
183.34793
km/h
|
100
knot
|
185.2
km/h
|
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