The mile per hour, commonly abbreviated as mph, is a unit of speed originating from the British imperial system and widely used in the United States and the United Kingdom. It’s fascinating to know that the concept of mph has historical significance dating back to the invention of the first automobiles in the late 19th century. The iconic cars of the 1920s, often called “classic cars,” were among the first to publicly advertise their capabilities in mph, including models like the Ford Model T, which had a top speed of about 45 mph.
Interestingly, mph is still the primary speed measurement unit for most road signage in countries such as the US and the UK, even while the rest of the world predominantly uses kilometers per hour (kph). The land-speed record attempts, including those made with the supersonic car “ThrustSSC,” which achieved an astonishing 763 mph in 1997, also emphasize the significance of this unit in measuring extreme speeds.
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.
Miles per hour | Knots |
---|---|
0
mph
|
0
knot
|
2
mph
|
1.73795
knot
|
4
mph
|
3.47591
knot
|
6
mph
|
5.21386
knot
|
8
mph
|
6.95181
knot
|
10
mph
|
8.68977
knot
|
12
mph
|
10.42772
knot
|
14
mph
|
12.16567
knot
|
16
mph
|
13.90363
knot
|
18
mph
|
15.64158
knot
|
20
mph
|
17.37953
knot
|
22
mph
|
19.11748
knot
|
24
mph
|
20.85544
knot
|
26
mph
|
22.59339
knot
|
28
mph
|
24.33134
knot
|
30
mph
|
26.0693
knot
|
32
mph
|
27.80725
knot
|
34
mph
|
29.5452
knot
|
36
mph
|
31.28316
knot
|
38
mph
|
33.02111
knot
|
40
mph
|
34.75906
knot
|
42
mph
|
36.49702
knot
|
44
mph
|
38.23497
knot
|
46
mph
|
39.97292
knot
|
48
mph
|
41.71088
knot
|
50
mph
|
43.44883
knot
|
52
mph
|
45.18678
knot
|
54
mph
|
46.92474
knot
|
56
mph
|
48.66269
knot
|
58
mph
|
50.40064
knot
|
60
mph
|
52.13859
knot
|
62
mph
|
53.87655
knot
|
64
mph
|
55.6145
knot
|
66
mph
|
57.35245
knot
|
68
mph
|
59.09041
knot
|
70
mph
|
60.82836
knot
|
72
mph
|
62.56631
knot
|
74
mph
|
64.30427
knot
|
76
mph
|
66.04222
knot
|
78
mph
|
67.78017
knot
|
80
mph
|
69.51813
knot
|
82
mph
|
71.25608
knot
|
84
mph
|
72.99403
knot
|
86
mph
|
74.73199
knot
|
88
mph
|
76.46994
knot
|
90
mph
|
78.20789
knot
|
92
mph
|
79.94585
knot
|
94
mph
|
81.6838
knot
|
96
mph
|
83.42175
knot
|
98
mph
|
85.1597
knot
|
100
mph
|
86.89766
knot
|
102
mph
|
88.63561
knot
|
104
mph
|
90.37356
knot
|
106
mph
|
92.11152
knot
|
108
mph
|
93.84947
knot
|
110
mph
|
95.58742
knot
|
112
mph
|
97.32538
knot
|
114
mph
|
99.06333
knot
|
116
mph
|
100.80128
knot
|
118
mph
|
102.53924
knot
|
120
mph
|
104.27719
knot
|
122
mph
|
106.01514
knot
|
124
mph
|
107.7531
knot
|
126
mph
|
109.49105
knot
|
128
mph
|
111.229
knot
|
130
mph
|
112.96696
knot
|
132
mph
|
114.70491
knot
|
134
mph
|
116.44286
knot
|
136
mph
|
118.18081
knot
|
138
mph
|
119.91877
knot
|
140
mph
|
121.65672
knot
|
142
mph
|
123.39467
knot
|
144
mph
|
125.13263
knot
|
146
mph
|
126.87058
knot
|
148
mph
|
128.60853
knot
|
150
mph
|
130.34649
knot
|
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