Here’s a drill size conversion table that provides common drill bit sizes in inches, millimeters, and their corresponding fractional or wire gauge sizes:
| Inch (Imperial) | Millimeters (Metric) | Fractional Size | Wire Gauge Size |
|---|---|---|---|
| 1/64″ | 0.3969 mm | – | – |
| 1/32″ | 0.7938 mm | – | – |
| 3/64″ | 1.1906 mm | – | – |
| 1/16″ | 1.5875 mm | 1/16 | #76 |
| 5/64″ | 1.9844 mm | – | – |
| 3/32″ | 2.3813 mm | 3/32 | #75 |
| 7/64″ | 2.7781 mm | – | – |
| 1/8″ | 3.1750 mm | 1/8 | #74 |
| 9/64″ | 3.5719 mm | – | – |
| 5/32″ | 3.9688 mm | 5/32 | #73 |
| 11/64″ | 4.3656 mm | – | – |
| 3/16″ | 4.7625 mm | 3/16 | #72 |
| 13/64″ | 5.1594 mm | – | – |
| 7/32″ | 5.5563 mm | 7/32 | #71 |
| 15/64″ | 5.9531 mm | – | – |
| 1/4″ | 6.3500 mm | 1/4 | #70 |
| 17/64″ | 6.7469 mm | – | – |
| 9/32″ | 7.1438 mm | 9/32 | #69 |
| 19/64″ | 7.5406 mm | – | – |
| 5/16″ | 7.9375 mm | 5/16 | #68 |
| 21/64″ | 8.3344 mm | – | – |
| 11/32″ | 8.7313 mm | 11/32 | #67 |
| 23/64″ | 9.1281 mm | – | – |
| 3/8″ | 9.5250 mm | 3/8 | #66 |
| 25/64″ | 9.9219 mm | – | – |
| 13/32″ | 10.3188 mm | 13/32 | #65 |
| 27/64″ | 10.7156 mm | – | – |
| 7/16″ | 11.1125 mm | 7/16 | #64 |
| 29/64″ | 11.5094 mm | – | – |
| 15/32″ | 11.9063 mm | 15/32 | #63 |
| 31/64″ | 12.3031 mm | – | – |
| 1/2″ | 12.7000 mm | 1/2 | #62 |
Please note that drill bit sizes may vary slightly between manufacturers, so it’s essential to check the specific sizes on the drill bits you have for precision drilling.
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