Metric Conversions
The purpose of this document is to provide metric conversions of all listed ring sizes (by inner diameter) and wire sizes used on this website (a slightly broader range in the case of ring IDs), for those viewers of this site who prefer to use that system.
The conversion used is simple: inches * 25.4 = mm. For example, a 1/4" ring would be (0.25 * 25.4 = 6.35 mm).
Listed Ring Inner Diameters
| Inches | Decimal Inches | Millimeters |
|---|
| 1/128" | 0.0078125" | 0.1984375 mm |
| 1/64" | 0.0156250" | 0.396875 mm |
| 3/128" | 0.0234375" | 0.5953125 mm |
| 1/32" | 0.0312500" | 0.79375 mm |
| 5/128" | 0.0390625" | 0.9921875 mm |
| 3/64" | 0.0468750" | 1.190625 mm |
| 7/128" | 0.0546875" | 1.3890625 mm |
| .057" | 0.0570000" | 1.4478 mm |
| 1/16" | 0.0625000" | 1.5875 mm |
| 9/128" | 0.0703125" | 1.7859375 mm |
| 5/64" | 0.0781250" | 1.984375 mm |
| 11/128" | 0.0859375" | 2.1828125 mm |
| 3/32" | 0.0937500" | 2.38125 mm |
| 13/128" | 0.1015625" | 2.5796875 mm |
| 7/64" | 0.1093750" | 2.778125 mm |
| 15/128" | 0.1171875" | 2.9765625 mm |
| 1/8" | 0.1250000" | 3.175 mm |
| 17/128" | 0.1328125" | 3.3734375 mm |
| 9/64" | 0.1406250" | 3.571875 mm |
| 19/128" | 0.1484375" | 3.7703125 mm |
| 5/32" | 0.1562500" | 3.96875 mm |
| 21/128" | 0.1640625" | 4.1671875 mm |
| 11/64" | 0.1718750" | 4.365625 mm |
| 23/128" | 0.1796875" | 4.5640625 mm |
| 3/16" | 0.1875000" | 4.7625 mm |
| 25/128" | 0.1953125" | 4.9609375 mm |
| 13/64" | 0.2031250" | 5.159375 mm |
| 27/128" | 0.2109375" | 5.3578125 mm |
| 7/32" | 0.2187500" | 5.55625 mm |
| 29/128" | 0.2265625" | 5.7546875 mm |
| 15/64" | 0.2343750" | 5.953125 mm |
| 31/128" | 0.2421875" | 6.1515625 mm |
| 1/4" | 0.2500000" | 6.35 mm |
| 33/128" | 0.2578125" | 6.5484375 mm |
| 17/64" | 0.2656250" | 6.746875 mm |
| 35/128" | 0.2734375" | 6.9453125 mm |
| 9/32" | 0.2812500" | 7.14375 mm |
| 37/128" | 0.2890625" | 7.3421875 mm |
| 19/64" | 0.2968750" | 7.540625 mm |
| 39/128" | 0.3046875" | 7.7390625 mm |
| 5/16" | 0.3125000" | 7.9375 mm |
| 41/128" | 0.3203125" | 8.1359375 mm |
| 21/64" | 0.3281250" | 8.334375 mm |
| 43/128" | 0.3359375" | 8.5328125 mm |
| 11/32" | 0.3437500" | 8.73125 mm |
| 45/128" | 0.3515625" | 8.9296875 mm |
| 23/64" | 0.3593750" | 9.128125 mm |
| 47/128" | 0.3671875" | 9.3265625 mm |
| 3/8" | 0.3750000" | 9.525 mm |
| 49/128" | 0.3828125" | 9.7234375 mm |
| 25/64" | 0.3906250" | 9.921875 mm |
| 51/128" | 0.3984375" | 10.1203125 mm |
| 13/32" | 0.4062500" | 10.31875 mm |
| 53/128" | 0.4140625" | 10.5171875 mm |
| 27/64" | 0.4218750" | 10.715625 mm |
| 55/128" | 0.4296875" | 10.9140625 mm |
| 7/16" | 0.4375000" | 11.1125 mm |
| 57/128" | 0.4453125" | 11.3109375 mm |
| 29/64" | 0.4531250" | 11.509375 mm |
| 59/128" | 0.4609375" | 11.7078125 mm |
| 15/32" | 0.4687500" | 11.90625 mm |
| 61/128" | 0.4765625" | 12.1046875 mm |
| 31/64" | 0.4843750" | 12.303125 mm |
| 63/128" | 0.4921875" | 12.5015625 mm |
| 1/2" | 0.5000000" | 12.7 mm |
| 65/128" | 0.5078125" | 12.8984375 mm |
| 33/64" | 0.5156200" | 13.096748 mm |
| 67/128" | 0.5234375" | 13.2953125 mm |
| 17/32" | 0.5312500" | 13.49375 mm |
| 69/128" | 0.5390625" | 13.6921875 mm |
| 35/64" | 0.5468700" | 13.890498 mm |
| 71/128" | 0.5546875" | 14.0890625 mm |
| 9/16" | 0.5625000" | 14.2875 mm |
| 73/128" | 0.5703125" | 14.4859375 mm |
| 37/64" | 0.5781200" | 14.684248 mm |
| 75/128" | 0.5859375" | 14.8828125 mm |
| 19/32" | 0.5937500" | 15.08125 mm |
| 77/128" | 0.6015625" | 15.2796875 mm |
| 39/64" | 0.6093700" | 15.477998 mm |
| 79/128" | 0.6171875" | 15.6765625 mm |
| 5/8" | 0.6250000" | 15.875 mm |
| 81/128" | 0.6328125" | 16.0734375 mm |
| 41/64" | 0.6406200" | 16.271748 mm |
| 83/128" | 0.6484375" | 16.4703125 mm |
| 21/32" | 0.6562500" | 16.66875 mm |
| 85/128" | 0.6640625" | 16.8671875 mm |
| 43/64" | 0.6718700" | 17.065498 mm |
| 87/128" | 0.6796875" | 17.2640625 mm |
| 11/16" | 0.6875000" | 17.4625 mm |
| 89/128" | 0.6953125" | 17.6609375 mm |
| 45/64" | 0.7031200" | 17.859248 mm |
| 91/128" | 0.7109375" | 18.0578125 mm |
| 23/32" | 0.7187500" | 18.25625 mm |
| 93/128" | 0.7265625" | 18.4546875 mm |
| 47/64" | 0.7343700" | 18.652998 mm |
| 95/128" | 0.7421875" | 18.8515625 mm |
| 3/4" | 0.7500000" | 19.05 mm |
| 97/128" | 0.7578125" | 19.2484375 mm |
| 49/64" | 0.7656200" | 19.446748 mm |
| 99/128" | 0.7734375" | 19.6453125 mm |
| 25/32" | 0.7812500" | 19.84375 mm |
| 101/128" | 0.7890625" | 20.0421875 mm |
| 51/64" | 0.7968700" | 20.240498 mm |
| 103/128" | 0.8046875" | 20.4390625 mm |
| 13/16" | 0.8125000" | 20.6375 mm |
| 105/128" | 0.8203125" | 20.8359375 mm |
| 53/64" | 0.8281200" | 21.034248 mm |
| 107/128" | 0.8359375" | 21.2328125 mm |
| 27/32" | 0.8437500" | 21.43125 mm |
| 109/128" | 0.8515625" | 21.6296875 mm |
| 55/64" | 0.8593700" | 21.827998 mm |
| 111/128" | 0.8671875" | 22.0265625 mm |
| 7/8" | 0.8750000" | 22.225 mm |
| 113/128" | 0.8828125" | 22.4234375 mm |
| 57/64" | 0.8906200" | 22.621748 mm |
| 115/128" | 0.8984375" | 22.8203125 mm |
| 29/32" | 0.9062500" | 23.01875 mm |
| 117/128" | 0.9140625" | 23.2171875 mm |
| 59/64" | 0.9218700" | 23.415498 mm |
| 119/128" | 0.9296875" | 23.6140625 mm |
| 15/16" | 0.9375000" | 23.8125 mm |
| 121/128" | 0.9453125" | 24.0109375 mm |
| 61/64" | 0.9531200" | 24.209248 mm |
| 123/128" | 0.9609375" | 24.4078125 mm |
| 31/32" | 0.9687500" | 24.60625 mm |
| 125/128" | 0.9765625" | 24.8046875 mm |
| 63/64" | 0.9843700" | 25.002998 mm |
| 127/128" | 0.9921875" | 25.2015625 mm |
| 1" | 1.0000000" | 25.4 mm |
Wire Sizes
| Inches | Millimeters |
|---|
| 0.020" | 0.508 mm |
| 0.025" | 0.635 mm |
| 0.028" | 0.7112 mm |
| 0.030" | 0.762 mm |
| 0.032" | 0.8128 mm |
| 0.034" | 0.8636 mm |
| 0.035" | 0.889 mm |
| 0.036" | 0.9144 mm |
| 0.040" | 1.016 mm |
| 0.041" | 1.0414 mm |
| 0.045" | 1.143 mm |
| 0.046" | 1.1684 mm |
| 0.047" | 1.1938 mm |
| 0.048" | 1.2192 mm |
| 0.050" | 1.27 mm |
| 0.057" | 1.4478 mm |
| 0.061" | 1.5494 mm |
| 0.062" | 1.5748 mm |
| 0.063" | 1.6002 mm |
| 0.064" | 1.6256 mm |
| 0.065" | 1.651 mm |
| 0.068" | 1.7272 mm |
| 0.072" | 1.8288 mm |
| 0.078" | 1.9812 mm |
| 0.080" | 2.032 mm |
| 0.086" | 2.1844 mm |
| 0.094" | 2.3876 mm |
| 0.100" | 2.54 mm |
| 0.105" | 2.667 mm |
| 0.123" | 3.1242 mm |
