The inch, once the size of a barleycorn kernel, has fascinating origins. Early English measurement systems based it on the width of a man’s thumb. In the 14th century, King Edward II of England formalized it, defining an inch as the length of three barleycorns laid end to end. Historically, the inch was crucial for countless innovations, especially in Anglo-Saxon countries, influencing everything from watchmaking to industrial design.
Today, the inch still plays an integral role in areas like screen sizes and standardized paper dimensions, delighting both tech enthusiasts and everyday users. Interestingly, in surveying, an inch is divided into hundredths in the US, showing its adaptability in precision tasks. Despite the global shift towards the metric system, the inch endures, showcasing its resilience and continued relevance.
The millimeter, a unit of length in the metric system, is commonly used to measure small dimensions with remarkable precision. Its significance is often seen in fields requiring meticulous attention to detail, like engineering and manufacturing. Interestingly, the human hair’s average diameter ranges between 70 to 100 micrometers, making the millimeter about 10 to 15 times larger. This highlights the millimeter’s role in bridging the gap between microscopic measurements and the macroscopic world.
Moreover, the millimeter plays a critical role in rainfall measurements, as meteorologists use it to report precipitation levels. One millimeter of rain translates to a liter of water per square meter, directly impacting environmental assessments and agricultural planning. Its ubiquitous presence in both science and daily life underscores its versatility and importance.
| Inches | Millimeters |
|---|---|
0
in
|
0
mm
|
1
in
|
25.4
mm
|
2
in
|
50.8
mm
|
3
in
|
76.2
mm
|
4
in
|
101.6
mm
|
5
in
|
127
mm
|
6
in
|
152.4
mm
|
7
in
|
177.8
mm
|
8
in
|
203.2
mm
|
9
in
|
228.6
mm
|
10
in
|
254
mm
|
11
in
|
279.4
mm
|
12
in
|
304.8
mm
|
13
in
|
330.2
mm
|
14
in
|
355.6
mm
|
15
in
|
381
mm
|
16
in
|
406.4
mm
|
17
in
|
431.8
mm
|
18
in
|
457.2
mm
|
19
in
|
482.6
mm
|
20
in
|
508
mm
|
21
in
|
533.4
mm
|
22
in
|
558.8
mm
|
23
in
|
584.2
mm
|
24
in
|
609.6
mm
|
25
in
|
635
mm
|
26
in
|
660.4
mm
|
27
in
|
685.8
mm
|
28
in
|
711.2
mm
|
29
in
|
736.6
mm
|
30
in
|
762
mm
|
31
in
|
787.4
mm
|
32
in
|
812.8
mm
|
33
in
|
838.2
mm
|
34
in
|
863.6
mm
|
35
in
|
889
mm
|
36
in
|
914.4
mm
|
37
in
|
939.8
mm
|
38
in
|
965.2
mm
|
39
in
|
990.6
mm
|
40
in
|
1016
mm
|
41
in
|
1041.4
mm
|
42
in
|
1066.8
mm
|
43
in
|
1092.2
mm
|
44
in
|
1117.6
mm
|
45
in
|
1143
mm
|
46
in
|
1168.4
mm
|
47
in
|
1193.8
mm
|
48
in
|
1219.2
mm
|
49
in
|
1244.6
mm
|
50
in
|
1270
mm
|
51
in
|
1295.4
mm
|
52
in
|
1320.8
mm
|
53
in
|
1346.2
mm
|
54
in
|
1371.6
mm
|
55
in
|
1397
mm
|
56
in
|
1422.4
mm
|
57
in
|
1447.8
mm
|
58
in
|
1473.2
mm
|
59
in
|
1498.6
mm
|
60
in
|
1524
mm
|
61
in
|
1549.4
mm
|
62
in
|
1574.8
mm
|
63
in
|
1600.2
mm
|
64
in
|
1625.6
mm
|
65
in
|
1651
mm
|
66
in
|
1676.4
mm
|
67
in
|
1701.8
mm
|
68
in
|
1727.2
mm
|
69
in
|
1752.6
mm
|
70
in
|
1778
mm
|
71
in
|
1803.4
mm
|
72
in
|
1828.8
mm
|
73
in
|
1854.2
mm
|
74
in
|
1879.6
mm
|
75
in
|
1905
mm
|
76
in
|
1930.4
mm
|
77
in
|
1955.8
mm
|
78
in
|
1981.2
mm
|
79
in
|
2006.6
mm
|
80
in
|
2032
mm
|
81
in
|
2057.4
mm
|
82
in
|
2082.8
mm
|
83
in
|
2108.2
mm
|
84
in
|
2133.6
mm
|
85
in
|
2159
mm
|
86
in
|
2184.4
mm
|
87
in
|
2209.8
mm
|
88
in
|
2235.2
mm
|
89
in
|
2260.6
mm
|
90
in
|
2286
mm
|
91
in
|
2311.4
mm
|
92
in
|
2336.8
mm
|
93
in
|
2362.2
mm
|
94
in
|
2387.6
mm
|
95
in
|
2413
mm
|
96
in
|
2438.4
mm
|
97
in
|
2463.8
mm
|
98
in
|
2489.2
mm
|
99
in
|
2514.6
mm
|
100
in
|
2540
mm
|
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