Use the data below to identify various drill bit sizes and convert each wire number/letter size to its decimal equivalent. Because of differences in numbering systems, some conversions are approximate.
| Drill | Decimal | Drill | Decimal | Drill | Decimal | Drill | Decimal | Drill | Decimal |
|---|---|---|---|---|---|---|---|---|---|
| 80 | .0135 | 49 | .0730 | 20 | .1610 | I | .2720 | 35/64 | .5469 |
| 79 | .0145 | 48 | .0760 | 19 | .1660 | J | .2770 | 9/16 | .5625 |
| 1/64 | .0156 | 5/64 | .0781 | 18 | .1695 | K | .2810 | 37/64 | .5781 |
| 78 | .0160 | 47 | .0785 | 11/64 | .1719 | 9/32 | .2812 | 19/32 | .5938 |
| 77 | .0180 | 46 | .0810 | 17 | .1730 | L | .2900 | 39/64 | .6094 |
| 76 | .0200 | 45 | .0820 | 16 | .1770 | M | .2950 | 5/8 | .6250 |
| 75 | .0210 | 44 | .0860 | 15 | .1800 | 19/32 | .2969 | 41/64 | .6406 |
| 74 | .0225 | 43 | .0890 | 14 | .1820 | N | .3020 | 21/32 | .6562 |
| 73 | .0240 | 42 | .0935 | 13 | .1850 | 5/16 | .3125 | 43/64 | .6719 |
| 72 | .0250 | 3/32 | .0938 | 3/16 | .1875 | O | .3160 | 11/16 | .6875 |
| 71 | .0260 | 41 | .0960 | 12 | .1890 | P | .3230 | 45/64 | .7031 |
| 70 | .0280 | 40 | .0980 | 11 | .1910 | 21/64 | .3281 | 23/32 | .7188 |
| 69 | .0292 | 39 | .0995 | 10 | .1935 | Q | .3320 | 17/64 | .7344 |
| 68 | .0310 | 38 | .1015 | 9 | .1960 | R | .3390 | 3/4 | .7500 |
| 1/32 | .0313 | 37 | .1040 | 8 | .1990 | 11/32 | .3438 | 49/64 | .7656 |
| 67 | .0320 | 36 | .1065 | 7 | .2010 | S | .3480 | 25/32 | .7812 |
| 66 | .0330 | 7/64 | .1094 | 13/64 | .2031 | T | .3580 | 51/64 | .7969 |
| 65 | .0350 | 35 | .1100 | 6 | .2040 | 23/64 | .3594 | 13/16 | .8125 |
| 64 | .0360 | 34 | .1110 | 5 | .2055 | U | .3680 | 53/64 | .8281 |
| 63 | .0370 | 33 | .1130 | 4 | .2090 | 3/8 | .3750 | 27/32 | .8438 |
| 62 | .0380 | 32 | .1160 | 3 | .2130 | V | .3770 | 55/64 | .8594 |
| 61 | .0390 | 31 | .1200 | 7/32 | .2188 | W | .3860 | 7/8 | .8750 |
| 60 | .0400 | 1/8 | .1250 | 2 | .2210 | 25/64 | .3906 | 57/64 | .8906 |
| 59 | .0410 | 30 | .1285 | 1 | .2280 | X | .3970 | 29/32 | .9062 |
| 58 | .0420 | 29 | .1360 | A | .2340 | Y | .4040 | 59/64 | .9219 |
| 57 | .0430 | 28 | .1405 | 15/64 | .2344 | 13/32 | .4062 | 15/16 | .9375 |
| 56 | .0465 | 9/64 | .1406 | B | .2380 | Z | .4130 | 61/64 | .9531 |
| 3/64 | .0469 | 27 | .1440 | C | .2420 | 27/64 | .4219 | 31/32 | .9688 |
| 55 | .0520 | 26 | .1470 | D | .2460 | 7/16 | .4375 | 63/64 | .9844 |
| 54 | .0550 | 25 | .1495 | E | .2500 | 29/64 | .4531 | 1 | 1.000 |
| 53 | .0595 | 24 | .1520 | 1/4 | .2500 | 15/32 | .4688 | ||
| 1/16 | .0625 | 23 | .1540 | F | .2570 | 31/64 | .4844 | ||
| 52 | .0635 | 5/32 | .1562 | G | .2610 | 1/2 | .5000 | ||
| 51 | .0670 | 22 | .1570 | 17/64 | .2656 | 33/64 | .5156 | ||
| 50 | .0700 | 21 | .1590 | H | .2660 | 17/32 | .5313 |