Metric / Imperial Conversions

Metric/Imperial Conversions


If you have the inches, and need to know the millimeters:

In order of increasing size...
1/16 inch = almost 2mm
1/8 inch = just barely over 3mm
1/4 inch = just barely over 6mm
5/16 inch = 8mm
3/8 inch = almost 10mm
1/2 inch = almost 13mm
5/8 inch = 16mm
3/4 inch = 19mm
7/8 inch = just barely over 22mm
1 inch = 25.4mm


If you have the millimeters, and need to know the inches:

1mm = just over 1/32 inch
2mm = just over 1/16 inch
3mm = almost 1/8 inch
4mm = 5/32 inch (= a bit over 1/8 inch)
5mm = just over 3/16 inch
6mm = almost 1/4 inch
7mm = almost 9/32 inch (= a bit over 1/4 inch)
8mm = 5/16 inch
9mm = almost 3/8 inch
10mm = just over 3/8 inch
11mm = almost 7/16 inch
12mm = almost 15/32 inch (= almost 1/2 inch)
13mm = just over 1/2 inch
14mm = almost 9/16 inch
15mm = almost 19/32 inch
16mm = 5/8 inch
17mm = almost 11/16 inch
18mm = just over 11/16 inch
19mm = 3/4 inch
20mm = 25/32 inch
21mm = just over 13/16 inch
22mm = almost 7/8 inch
23mm = 29/32 inch
24mm = just over 15/16 inch
25mm = almost 1 inch