Shop reference tools
Drill Size Chart
Find fractional, number, letter, and metric drill sizes with decimal inch and millimeter equivalents.
Drill 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 |