Converting decimals to inches, and inches to decimals is extremely important in many areas of working within manufacturing, and with industrial machine parts. Knowing something as simple as a 1/8 inch size to decimal, or 0.5938 decimal in inches can have important effects on the outcome of a project or a fix if even slightly off. So, we’ve added this table, and a quick calculator to give you a fast and easy reference.
Fractional Inches to Decimal Inches Conversion Table
| Fraction (inches) | Decimal (inches) | Millimeters (mm) |
|---|---|---|
| 1 | 1.0000 | 25.4000 |
| Halves | ||
| 1/2 | 0.5000 | 12.7000 |
| Quarters | ||
| 1/4 | 0.2500 | 6.3500 |
| 3/4 | 0.7500 | 19.0500 |
| Eighths | ||
| 1/8 | 0.1250 | 3.1750 |
| 3/8 | 0.3750 | 9.5250 |
| 5/8 | 0.6250 | 15.8750 |
| 7/8 | 0.8750 | 22.2250 |
| Sixteenths | ||
| 1/16 | 0.0625 | 1.5875 |
| 3/16 | 0.1875 | 4.7625 |
| 5/16 | 0.3125 | 7.9375 |
| 7/16 | 0.4375 | 11.1125 |
| 9/16 | 0.5625 | 14.2875 |
| 11/16 | 0.6875 | 17.4625 |
| 13/16 | 0.8125 | 20.6375 |
| 15/16 | 0.9375 | 23.8125 |
| Thirty-Seconds | ||
| 1/32 | 0.0313 | 0.7938 |
| 3/32 | 0.0938 | 2.3813 |
| 5/32 | 0.1563 | 3.9688 |
| 7/32 | 0.2188 | 5.5563 |
| 9/32 | 0.2813 | 7.1438 |
| 11/32 | 0.3438 | 8.7313 |
| 13/32 | 0.4063 | 10.3188 |
| 15/32 | 0.4688 | 11.9063 |
| 17/32 | 0.5313 | 13.4938 |
| 19/32 | 0.5938 | 15.0813 |
| 21/32 | 0.6563 | 16.6688 |
| 23/32 | 0.7188 | 18.2563 |
| 25/32 | 0.7813 | 19.8438 |
| 27/32 | 0.8438 | 21.4313 |
| 29/32 | 0.9063 | 23.0188 |
| 31/32 | 0.9688 | 24.6063 |
| Sixty-Fourths | ||
| 1/64 | 0.0156 | 0.3969 |
| 3/64 | 0.0469 | 1.1906 |
| 5/64 | 0.0781 | 1.9844 |
| 7/64 | 0.1094 | 2.7781 |
| 9/64 | 0.1406 | 3.5719 |
| 11/64 | 0.1719 | 4.3656 |
| 13/64 | 0.2031 | 5.1594 |
| 15/64 | 0.2344 | 5.9531 |
| 17/64 | 0.2656 | 6.7469 |
| 19/64 | 0.2969 | 7.5406 |
| 21/64 | 0.3281 | 8.3344 |
| 23/64 | 0.3594 | 9.1281 |
| 25/64 | 0.3906 | 9.9219 |
| 27/64 | 0.4219 | 10.7156 |
| 29/64 | 0.4531 | 11.5094 |
| 31/64 | 0.4844 | 12.3031 |
| 33/64 | 0.5156 | 13.0969 |
| 35/64 | 0.5469 | 13.8906 |
| 37/64 | 0.5781 | 14.6844 |
| 39/64 | 0.6094 | 15.4781 |
| 41/64 | 0.6406 | 16.2719 |
| 43/64 | 0.6719 | 17.0656 |
| 45/64 | 0.7031 | 17.8594 |
| 47/64 | 0.7344 | 18.6531 |
| 49/64 | 0.7656 | 19.4469 |
| 51/64 | 0.7969 | 20.2406 |
| 53/64 | 0.8281 | 21.0344 |
| 55/64 | 0.8594 | 21.8281 |
| 57/64 | 0.8906 | 22.6219 |
| 59/64 | 0.9219 | 23.4156 |
| 61/64 | 0.9531 | 24.2094 |
| 63/64 | 0.9844 | 25.0031 |
| One Hundred Twenty-Eighths | ||
| 1/128 | 0.0078 | 0.1984 |
| 3/128 | 0.0234 | 0.5953 |
| 5/128 | 0.0391 | 0.9922 |
| 7/128 | 0.0547 | 1.3891 |
| 9/128 | 0.0703 | 1.7859 |
| 11/128 | 0.0859 | 2.1828 |
| 13/128 | 0.1016 | 2.5797 |
| 15/128 | 0.1172 | 2.9766 |
| 17/128 | 0.1328 | 3.3734 |
| 19/128 | 0.1484 | 3.7703 |
| 21/128 | 0.1641 | 4.1672 |
| 23/128 | 0.1797 | 4.5641 |
| 25/128 | 0.1953 | 4.9609 |
| 27/128 | 0.2109 | 5.3578 |
| 29/128 | 0.2266 | 5.7547 |
| 31/128 | 0.2422 | 6.1516 |
| 33/128 | 0.2578 | 6.5484 |
| 35/128 | 0.2734 | 6.9453 |
| 37/128 | 0.2891 | 7.3422 |
| 39/128 | 0.3047 | 7.7391 |
| 41/128 | 0.3203 | 8.1359 |
| 43/128 | 0.3359 | 8.5328 |
| 45/128 | 0.3516 | 8.9297 |
| 47/128 | 0.3672 | 9.3266 |
| 49/128 | 0.3828 | 9.7234 |
| 51/128 | 0.3984 | 10.1203 |
| 53/128 | 0.4141 | 10.5172 |
| 55/128 | 0.4297 | 10.9141 |
| 57/128 | 0.4453 | 11.3109 |
| 59/128 | 0.4609 | 11.7078 |
| 61/128 | 0.4766 | 12.1047 |
| 63/128 | 0.4922 | 12.5016 |
| 65/128 | 0.5078 | 12.8984 |
| 67/128 | 0.5234 | 13.2953 |
| 69/128 | 0.5391 | 13.6922 |
| 71/128 | 0.5547 | 14.0891 |
| 73/128 | 0.5703 | 14.4859 |
| 75/128 | 0.5859 | 14.8828 |
| 77/128 | 0.6016 | 15.2797 |
| 79/128 | 0.6172 | 15.6766 |
| 81/128 | 0.6328 | 16.0734 |
| 83/128 | 0.6484 | 16.4703 |
| 85/128 | 0.6641 | 16.8672 |
| 87/128 | 0.6797 | 17.2641 |
| 89/128 | 0.6953 | 17.6609 |
| 91/128 | 0.7109 | 18.0578 |
| 93/128 | 0.7266 | 18.4547 |
| 95/128 | 0.7422 | 18.8516 |
| 97/128 | 0.7578 | 19.2484 |
| 99/128 | 0.7734 | 19.6453 |
| 101/128 | 0.7891 | 20.0422 |
| 103/128 | 0.8047 | 20.4391 |
| 105/128 | 0.8203 | 20.8359 |
| 107/128 | 0.8359 | 21.2328 |
| 109/128 | 0.8516 | 21.6297 |
| 111/128 | 0.8672 | 22.0266 |
| 113/128 | 0.8828 | 22.4234 |
| 115/128 | 0.8984 | 22.8203 |
| 117/128 | 0.9141 | 23.2172 |
| 119/128 | 0.9297 | 23.6141 |
| 121/128 | 0.9453 | 24.0109 |
Fractional Inches to Decimal to mm Calculator
MISUMI USA carries a wide range of configurable parts and materials for every type of industrial manufacturing job including – aluminum extrusions, linear shafts, and more. If you have any questions about sizing or measurements for your next project or current fix, please feel free to connect with our product experts and engineers. And, be sure check out our other helpful resources articles on inches to millimeters conversion, metric socket head cap screw size chart, and more.
Author: Scott Bredemann | Updated: 7/29/2025
Disclaimer:
The content on this webpage is for informational purposes only. MISUMI makes no guarantees, expressed or implied, regarding the accuracy, completeness, or validity of the information. Performance parameters, tolerances, designs, materials, or processes should not be assumed to reflect third-party suppliers’ or manufacturers’ deliverables within MISUMI’s network. Buyers are responsible for specifying their part requirements