The mil is a unit of measurement commonly used in various fields, including manufacturing and meteorology. Originating from the Latin word “millesimum,” meaning “thousandth,” a mil represents one-thousandth of an inch (0.001 inches). Its precision makes it indispensable for industries where exact measurements are crucial, such as printing and engineering. In the world of meteorology, mils are used to measure precipitation, helping to forecast weather conditions accurately.
Interestingly, the term “mil” is also often used interchangeably with “thou,” especially in the machining and engineering sectors. This small yet significant unit plays a vital role in ensuring quality control and standardization across different industries, highlighting its essential presence in our everyday life and technological advancements.
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.
| Mils | Inches |
|---|---|
0
mil
|
0
in
|
10
mil
|
0.01
in
|
20
mil
|
0.02
in
|
30
mil
|
0.03
in
|
40
mil
|
0.04
in
|
50
mil
|
0.05
in
|
60
mil
|
0.06
in
|
70
mil
|
0.07
in
|
80
mil
|
0.08
in
|
90
mil
|
0.09
in
|
100
mil
|
0.1
in
|
110
mil
|
0.11
in
|
120
mil
|
0.12
in
|
130
mil
|
0.13
in
|
140
mil
|
0.14
in
|
150
mil
|
0.15
in
|
160
mil
|
0.16
in
|
170
mil
|
0.17
in
|
180
mil
|
0.18
in
|
190
mil
|
0.19
in
|
200
mil
|
0.2
in
|
210
mil
|
0.21
in
|
220
mil
|
0.22
in
|
230
mil
|
0.23
in
|
240
mil
|
0.24
in
|
250
mil
|
0.25
in
|
260
mil
|
0.26
in
|
270
mil
|
0.27
in
|
280
mil
|
0.28
in
|
290
mil
|
0.29
in
|
300
mil
|
0.3
in
|
310
mil
|
0.31
in
|
320
mil
|
0.32
in
|
330
mil
|
0.33
in
|
340
mil
|
0.34
in
|
350
mil
|
0.35
in
|
360
mil
|
0.36
in
|
370
mil
|
0.37
in
|
380
mil
|
0.38
in
|
390
mil
|
0.39
in
|
400
mil
|
0.4
in
|
410
mil
|
0.41
in
|
420
mil
|
0.42
in
|
430
mil
|
0.43
in
|
440
mil
|
0.44
in
|
450
mil
|
0.45
in
|
460
mil
|
0.46
in
|
470
mil
|
0.47
in
|
480
mil
|
0.48
in
|
490
mil
|
0.49
in
|
500
mil
|
0.5
in
|
510
mil
|
0.51
in
|
520
mil
|
0.52
in
|
530
mil
|
0.53
in
|
540
mil
|
0.54
in
|
550
mil
|
0.55
in
|
560
mil
|
0.56
in
|
570
mil
|
0.57
in
|
580
mil
|
0.58
in
|
590
mil
|
0.59
in
|
600
mil
|
0.6
in
|
610
mil
|
0.61
in
|
620
mil
|
0.62
in
|
630
mil
|
0.63
in
|
640
mil
|
0.64
in
|
650
mil
|
0.65
in
|
660
mil
|
0.66
in
|
670
mil
|
0.67
in
|
680
mil
|
0.68
in
|
690
mil
|
0.69
in
|
700
mil
|
0.7
in
|
710
mil
|
0.71
in
|
720
mil
|
0.72
in
|
730
mil
|
0.73
in
|
740
mil
|
0.74
in
|
750
mil
|
0.75
in
|
760
mil
|
0.76
in
|
770
mil
|
0.77
in
|
780
mil
|
0.78
in
|
790
mil
|
0.79
in
|
800
mil
|
0.8
in
|
810
mil
|
0.81
in
|
820
mil
|
0.82
in
|
830
mil
|
0.83
in
|
840
mil
|
0.84
in
|
850
mil
|
0.85
in
|
860
mil
|
0.86
in
|
870
mil
|
0.87
in
|
880
mil
|
0.88
in
|
890
mil
|
0.89
in
|
900
mil
|
0.9
in
|
910
mil
|
0.91
in
|
920
mil
|
0.92
in
|
930
mil
|
0.93
in
|
940
mil
|
0.94
in
|
950
mil
|
0.95
in
|
960
mil
|
0.96
in
|
970
mil
|
0.97
in
|
980
mil
|
0.98
in
|
990
mil
|
0.99
in
|
1000
mil
|
1
in
|
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