Refer to this chart when the measurements are noted in millimeters. Smaller items are usually measured in millimeters as it is a more accurate measurement. To insure accuracy of your measurements in these small increments a special tool called calipers or leveridge gauge is recommended. If using a ruler please remember that ruler measurements are only to be used as a guide and may be off by as much as a millimeter or two.
|
| MM
|
Approximate Size In Inches
|
Exact Size In Inches
|
| 1mm
|
1/32 Inch
|
0.03937 Inches
|
| 2mm
|
1/16 Inch
|
0.07874 Inches
|
| 3mm
|
3/32 Inch
|
0.11811 Inches
|
| 4mm
|
1/8 Inch
|
0.15748 Inches
|
| 5mm
|
3/16 Inch
|
0.19685 Inches
|
| 6mm
|
Just short of 1/4 Inch
|
0.23622 Inches
|
| 7mm
|
Little over 1/4 Inch
|
0.27559 Inches
|
| 8mm
|
5/16 Inch
|
0.31496 Inches
|
| 9mm
|
Just short of 3/8 Inch
|
0.35433 Inches
|
| 10mm
|
Little over 3/8 Inch
|
0.39370 Inches
|
| 11mm
|
7/16 Inch
|
0.43307 Inches
|
| 12mm
|
Just short of 1/2 Inch
|
0.47244 Inches
|
| 13mm
|
Little over 1/2 Inch
|
0.51181 Inches
|
| 14mm
|
9/16 Inch
|
0.55118 Inches
|
| 15mm
|
Just short of 5/8 Inch
|
0.59055 Inches
|
| 16mm
|
5/8 Inch
|
0.62992 Inches
|
| 17mm
|
Just short of 11/16 Inch
|
0.66929 Inches
|
| 18mm
|
Just short of 3/4 Inch
|
0.70866 Inches
|
| 19mm
|
Little over 3/4 Inch
|
0.74803 Inches
|
| 20mm
|
Just short of 13/16 Inch
|
0.78740 Inches
|
| 21mm
|
Little over 13/16 Inch
|
0.82677 Inches
|
| 22mm
|
Just short of 7/8 Inch
|
0.86614 Inches
|
| 23mm
|
Little over 7/8 Inch
|
0.90551 Inches
|
| 24mm
|
15/16 Inch
|
0.94488 Inches
|
| 25mm
|
1 Inch
|
0.98425 Inches
|
|
