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US to Metric Conversion Table

US
(inches)
Metric
(millimeters)
1/16 1.6
1/8 3.2
3/16 4.8
1/4 6.4
5/16 7.9
3/8 9.5
7/16 11
1/2 13
9/16 14
5/8 16
11/16 17
3/4 19
13/16 21
7/8 22
15/16 24
1 25
1-1/8 29
1-1/4 32
1-3/8 35
US
(inches)
Metric
(millimeters)
1-1/2 38
1-5/8 41
1-3/4 45
1-7/8 48
2 51
2-1/4 57
2-1/2 64
2-3/4 70
3 76
3-1/4 83
3-1/2 89
3-3/4 95
4 102
4-1/2 114
5 127
5-1/2 140
6 152
6-1/2 165
7 178