The US Survey Foot might seem like an unassuming unit, but it’s steeped in the very history of American land measurement. Unlike the International Foot, which is precisely defined as 0.3048 meters, the US Survey Foot is ever-so-slightly longer at approximately 0.3048006 meters. This minuscule difference stems from surveying practices established in the early 19th century and has historically been used for mapping and property delineation across the United States. Integral to the country’s westward expansion, the US Survey Foot played a pivotal role in the division and sale of public lands—underscoring its foundational impact on both real estate and infrastructure.
Despite its historical significance, the US Survey Foot was officially deprecated at the end of 2022, as the US moves towards a unified use of the International Foot for federal geodetic surveys. This transition simplifies engineering and scientific calculations, streamlining US standards with global practices. The legacy of the US Survey Foot, however, serves as a fascinating footnote in the story of American land development, marking an era when precise measurements charted the course of a growing nation.
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.
| US Survey Feet | Millimeters |
|---|---|
0
ft-us
|
0
mm
|
1
ft-us
|
304.8006
mm
|
2
ft-us
|
609.6012
mm
|
3
ft-us
|
914.4018
mm
|
4
ft-us
|
1219.2024
mm
|
5
ft-us
|
1524.003
mm
|
6
ft-us
|
1828.8036
mm
|
7
ft-us
|
2133.6042
mm
|
8
ft-us
|
2438.4048
mm
|
9
ft-us
|
2743.2054
mm
|
10
ft-us
|
3048.006
mm
|
11
ft-us
|
3352.8066
mm
|
12
ft-us
|
3657.6072
mm
|
13
ft-us
|
3962.4078
mm
|
14
ft-us
|
4267.2084
mm
|
15
ft-us
|
4572.009
mm
|
16
ft-us
|
4876.8096
mm
|
17
ft-us
|
5181.6102
mm
|
18
ft-us
|
5486.4108
mm
|
19
ft-us
|
5791.2114
mm
|
20
ft-us
|
6096.012
mm
|
21
ft-us
|
6400.8126
mm
|
22
ft-us
|
6705.6132
mm
|
23
ft-us
|
7010.4138
mm
|
24
ft-us
|
7315.2144
mm
|
25
ft-us
|
7620.015
mm
|
26
ft-us
|
7924.8156
mm
|
27
ft-us
|
8229.6162
mm
|
28
ft-us
|
8534.4168
mm
|
29
ft-us
|
8839.2174
mm
|
30
ft-us
|
9144.018
mm
|
31
ft-us
|
9448.8186
mm
|
32
ft-us
|
9753.6192
mm
|
33
ft-us
|
10058.41979
mm
|
34
ft-us
|
10363.22039
mm
|
35
ft-us
|
10668.02099
mm
|
36
ft-us
|
10972.82159
mm
|
37
ft-us
|
11277.62219
mm
|
38
ft-us
|
11582.42279
mm
|
39
ft-us
|
11887.22339
mm
|
40
ft-us
|
12192.02399
mm
|
41
ft-us
|
12496.82459
mm
|
42
ft-us
|
12801.62519
mm
|
43
ft-us
|
13106.42579
mm
|
44
ft-us
|
13411.22639
mm
|
45
ft-us
|
13716.02699
mm
|
46
ft-us
|
14020.82759
mm
|
47
ft-us
|
14325.62819
mm
|
48
ft-us
|
14630.42879
mm
|
49
ft-us
|
14935.22939
mm
|
50
ft-us
|
15240.03
mm
|
51
ft-us
|
15544.83059
mm
|
52
ft-us
|
15849.63119
mm
|
53
ft-us
|
16154.43179
mm
|
54
ft-us
|
16459.23239
mm
|
55
ft-us
|
16764.03299
mm
|
56
ft-us
|
17068.83359
mm
|
57
ft-us
|
17373.63419
mm
|
58
ft-us
|
17678.43479
mm
|
59
ft-us
|
17983.23539
mm
|
60
ft-us
|
18288.03599
mm
|
61
ft-us
|
18592.83659
mm
|
62
ft-us
|
18897.63719
mm
|
63
ft-us
|
19202.43779
mm
|
64
ft-us
|
19507.23839
mm
|
65
ft-us
|
19812.03899
mm
|
66
ft-us
|
20116.83959
mm
|
67
ft-us
|
20421.64019
mm
|
68
ft-us
|
20726.44079
mm
|
69
ft-us
|
21031.24139
mm
|
70
ft-us
|
21336.04199
mm
|
71
ft-us
|
21640.84259
mm
|
72
ft-us
|
21945.64319
mm
|
73
ft-us
|
22250.44379
mm
|
74
ft-us
|
22555.24439
mm
|
75
ft-us
|
22860.04499
mm
|
76
ft-us
|
23164.84559
mm
|
77
ft-us
|
23469.64619
mm
|
78
ft-us
|
23774.44679
mm
|
79
ft-us
|
24079.24739
mm
|
80
ft-us
|
24384.04799
mm
|
81
ft-us
|
24688.84859
mm
|
82
ft-us
|
24993.64919
mm
|
83
ft-us
|
25298.44979
mm
|
84
ft-us
|
25603.25039
mm
|
85
ft-us
|
25908.05099
mm
|
86
ft-us
|
26212.85159
mm
|
87
ft-us
|
26517.65219
mm
|
88
ft-us
|
26822.45279
mm
|
89
ft-us
|
27127.25339
mm
|
90
ft-us
|
27432.05399
mm
|
91
ft-us
|
27736.85459
mm
|
92
ft-us
|
28041.65519
mm
|
93
ft-us
|
28346.45579
mm
|
94
ft-us
|
28651.25639
mm
|
95
ft-us
|
28956.05699
mm
|
96
ft-us
|
29260.85759
mm
|
97
ft-us
|
29565.65819
mm
|
98
ft-us
|
29870.45878
mm
|
99
ft-us
|
30175.25938
mm
|
100
ft-us
|
30480.05998
mm
|
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