US to Metric Conversion
 
US

Metric
millimeters

1/8
3.175
3/16
4.762
1/4
6.35
5/16
7.938
3/8
9.525
7/16
11.112
1/2
12.7
9/16
14.288
5/8
15.875
11/16
17.462
3/4
19.05
13/16
20.638
7/8
22.225
15/16
23.812
1
25.40
US

Metric
millimeters
1-1/16
26.99
1-1/8
28.57
1-3/16
30.16
1-1/4
31.75
1-5/16
33.34
1-3/8
34.92
1-7/16
36.51
1-1/2
38.10
1-9/16
39.69
1-5/8
41.27
1-11/16
42.86
1-3/4
44.45
1-13/16
46.04
1-7/8
47.62
1-15/16
49.21

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