Inch Fraction Table
A handy reference for converting inch fractions to decimals and millimeters.
| Fraction | Decimal (in) | Millimeters (mm) |
|---|---|---|
| 1/32 | 0.0313 | 0.79 |
| 1/16 | 0.0625 | 1.59 |
| 3/32 | 0.0938 | 2.38 |
| 1/8 | 0.125 | 3.17 |
| 5/32 | 0.1563 | 3.97 |
| 3/16 | 0.1875 | 4.76 |
| 7/32 | 0.2188 | 5.56 |
| 1/4 | 0.25 | 6.35 |
| 9/32 | 0.2813 | 7.14 |
| 5/16 | 0.3125 | 7.94 |
| 11/32 | 0.3438 | 8.73 |
| 3/8 | 0.375 | 9.52 |
| 13/32 | 0.4063 | 10.32 |
| 7/16 | 0.4375 | 11.11 |
| 15/32 | 0.4688 | 11.91 |
| 1/2 | 0.5 | 12.70 |
| 17/32 | 0.5313 | 13.49 |
| 9/16 | 0.5625 | 14.29 |
| 19/32 | 0.5938 | 15.08 |
| 5/8 | 0.625 | 15.88 |
| 21/32 | 0.6563 | 16.67 |
| 11/16 | 0.6875 | 17.46 |
| 23/32 | 0.7188 | 18.26 |
| 3/4 | 0.75 | 19.05 |
| 25/32 | 0.7813 | 19.84 |
| 13/16 | 0.8125 | 20.64 |
| 27/32 | 0.8438 | 21.43 |
| 7/8 | 0.875 | 22.22 |
| 29/32 | 0.9063 | 23.02 |
| 15/16 | 0.9375 | 23.81 |
| 31/32 | 0.9688 | 24.61 |
| 1 | 1 | 25.40 |
How to read an inch ruler
An inch is typically divided into fractions rather than decimals. The most common divisions are halves, quarters, eighths, and sixteenths. Some rulers also show thirty-seconds. Use the table above to quickly convert these fractions if needed.