Metric Conversion Table, to Fractional and Decimal Inches
Use this quick reference metric conversion table to quickly convert your metric drill bits to fractional, or decimal-inch equivalents when you need to drill holes for your woodturning projects. Additional sizes and types of bits will be added to this metric conversion table in the near future. Print a copy of this table out and keep it in your studio near your drill bits as a handy cross-reference when needed.

| Millimetres | Fractional Eq. | Decimal-Inch |
|---|
| .397 | 1/64 | .015625 | | .794 | 1/32 | .03125 | | 1.191 | 3/64 | .046875 | | 1.588 | 1/16 | .0625 | | 1.984 | 5/64 | .078125 | | 2.381 | 3/32 | .09375 | | 2.778 | 7/64 | .109375 | | 3.175 | 1/8 | .125 | | 3.572 | 9/64 | .140625 | | 3.969 | 5/32 | .15625 | | 4.366 | 11/64 | .171875 | | 4.762 | 3/16 | .1875 | | 5.159 | 13/64 | .203125 | | 5.556 | 7/32 | .21875 | | 5.953 | 15/64 | .234375 | | 6.350 | 1/4 | .25 | | 6.747 | 17/64 | .265625 | | 7.144 | 9/32 | .28125 | | 7.541 | 19/64 | 296875 | | 7.938 | 5/16 | .3125 | | 8.334 | 21/64 | .328125 | | 8.731 | 11/32 | .34375 | | 9.128 | 23/64 | .359375 | | 9.525 | 3/8 | .375 | | 9.922 | 25/64 | .390625 | | 10.319 | 13/32 | .40625 | | 10.716 | 27/64 | .421875 | | 11.112 | 7/16 | .4375 | | 11.509 | 29/64 | .453125 | | 11.906 | 15/32 | .46875 | | 12.303 | 31/64 | .484375 | | 12.700 | 1/2 | .50 | | 13.097 | 33/64 | .515625 | | 13.494 | 17/32 | .53125 | | 13.891 | 35/64 | ..546875 | | 14.288 | 9/16 | .5625 | | 14.684 | 37/64 | .578125 | | 15.081 | 19/32 | .59375 | | 15.478 | 39/64 | .609375 | | 15.875 | 5/8 | .625 | | 16.272 | 41/64 | .640625 | | 16.669 | 21/32 | .65625 | | 17.066 | 43/64 | .671875 | | 17.462 | 11/16 | .6875 | | 17.859 | 45/64 | .703125 | | 18.256 | 23/32 | .71875 | | 18.653 | 47/64 | .734375 | | 19.050 | 3/4 | .75 | | 19.447 | 49/64 | .765625 | | 19.844 | 25/32 | .78125 | | 20.241 | 51/64 | .796875 | | 20.638 | 13/16 | .8125 | | 21.034 | 53/64 | .828125 | | 21.431 | 27/32 | .84375 | | 21.828 | 55/64 | .859375 | | 22.225 | 7/8 | .875 | | 22.622 | 57/64 | .890625 | | 23.019 | 29/32 | .90625 | | 23.416 | 59/64 | .921875 | | 23.812 | 15/16 | .9375 | | 24.209 | 61/64 | .953125 | | 24.606 | 31/32 | .96875 | | 25.003 | 63/64 | .984375 | | 25.400 | 1 | 1.000 |
 | Steven D. Russell is a professional studio woodturner, teacher and writer. He has written numerous articles for international woodturning magazines, which have been published in more than 78 countries around the world. Steve has demonstrated in numerous cities across the United States. His studio, Eurowood Werks, specializes in bowls, platters and hollow forms with unique visual and tactile treatments. |
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