Shop reference tools
Drill Bit Size Chart
Search common drill bit sizes and compare inch, decimal, and metric measurements.
Drill Bit Size Chart lookup
Start with the table, then use the related pages for tapping, clearance holes, pilot holes, and printable shop sheets.
| Size | Decimal inch | Millimeters | Family |
|---|---|---|---|
| 1/16 | 0.0625 | 1.588 | fractional |
| 5/64 | 0.0781 | 1.984 | fractional |
| 3/32 | 0.0938 | 2.381 | fractional |
| 7/64 | 0.1094 | 2.778 | fractional |
| 1/8 | 0.1250 | 3.175 | fractional |
| 9/64 | 0.1406 | 3.572 | fractional |
| 5/32 | 0.1563 | 3.969 | fractional |
| 11/64 | 0.1719 | 4.366 | fractional |
| 3/16 | 0.1875 | 4.763 | fractional |
| 13/64 | 0.2031 | 5.159 | fractional |
| 7/32 | 0.2188 | 5.556 | fractional |
| 15/64 | 0.2344 | 5.953 | fractional |
| 1/4 | 0.2500 | 6.350 | fractional |
| 17/64 | 0.2656 | 6.747 | fractional |
| 9/32 | 0.2813 | 7.144 | fractional |
| 19/64 | 0.2969 | 7.541 | fractional |
| 5/16 | 0.3125 | 7.938 | fractional |
| 21/64 | 0.3281 | 8.334 | fractional |
| 11/32 | 0.3438 | 8.731 | fractional |
| 23/64 | 0.3594 | 9.128 | fractional |
| 3/8 | 0.3750 | 9.525 | fractional |
| 25/64 | 0.3906 | 9.922 | fractional |
| 13/32 | 0.4063 | 10.319 | fractional |
| 27/64 | 0.4219 | 10.716 | fractional |
| 7/16 | 0.4375 | 11.113 | fractional |
| 29/64 | 0.4531 | 11.509 | fractional |
| 15/32 | 0.4688 | 11.906 | fractional |
| 31/64 | 0.4844 | 12.303 | fractional |
| 1/2 | 0.5000 | 12.700 | fractional |
| #43 | 0.0890 | 2.261 | number |
| #36 | 0.1065 | 2.705 | number |
| #29 | 0.1360 | 3.454 | number |
| #25 | 0.1495 | 3.797 | number |
| #21 | 0.1590 | 4.039 | number |
| #7 | 0.2010 | 5.105 | number |
| #3 | 0.2130 | 5.410 | number |
| F | 0.2570 | 6.528 | letter |
| I | 0.2720 | 6.909 | letter |
| Q | 0.3320 | 8.433 | letter |