Metric Conversion (mm to inches)
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Below is a chart to help out on the Metric (mm) conversion to inches (Fraction) and in Inches (decimal).
| MM | Approx. Size In Inches | Exact Size In Inches |
| 1mm | 1/25" | 0.03937 |
| 2mm | 1/16" | 0.07874 |
| 3mm | 3/32" | 0.11811 |
| 4mm | 1/8" | 0.15748 |
| 5mm | 3/16" | 0.19685 |
| 6mm | Just short of 1/4" | 0.23622 |
| 7mm | Little over 1/4" | 0.27559 |
| 8mm | 5/16" | 0.31496 |
| 9mm | Just short of 3/8" | 0.35433 |
| 10mm | Little over 3/8" | 0.3937 |
| 11mm | 7/16" | 0.43307 |
| 12mm | Just short of 1/2" | 0.47244 |
| 13mm | Little over 1/2" | 0.51181 |
| 14mm | 9/16" | 0.55118 |
| 15mm | Just short of 5/8" | 0.59055 |
| 16mm | 5/8" | 0.62992 |
| 17mm | Just short of 11/16" | 0.66929 |
| 18mm | Just short of 3/4" | 0.70866 |
| 19mm | Little under 3/4" | 0.74803 |
| 20mm | Just short of 13/16" | 0.7874 |
| 21mm | Little over 13/16" | 0.82677 |
| 22mm | Just short of 7/8" | 0.86614 |
| 23mm | Little over 7/8" | 0.90551 |
| 24mm | 15/16" | 0.94488 |
| 25mm | 1" | 0.98425 |