SHOP MATH
Decimal to Fraction Chart
Fraction, decimal and millimeter equivalents for every 64th of an inch from 1/64″ to 1″. Enter any decimal, fraction or millimeter value to round it to the nearest 1/64, 1/32, 1/16 or 1/8 inch.
CONVERTER
Decimal or mm to fraction
= 0.31250 in = 7.938 mm · exact 64th
- Nearest 1/64
- 5/16″exact
- Nearest 1/32
- 5/16″exact
- Nearest 1/16
- 5/16″exact
- Nearest 1/8
- 3/8″+0.0625 in
1/64″ TO 1″
Fraction to decimal and mm chart
| Fraction | Decimal in | mm |
|---|---|---|
| 1/64″ | 0.015625 | 0.3969 |
| 1/32″ | 0.03125 | 0.7937 |
| 3/64″ | 0.046875 | 1.1906 |
| 1/16″ | 0.0625 | 1.5875 |
| 5/64″ | 0.078125 | 1.9844 |
| 3/32″ | 0.09375 | 2.3812 |
| 7/64″ | 0.109375 | 2.7781 |
| 1/8″ | 0.125 | 3.1750 |
| 9/64″ | 0.140625 | 3.5719 |
| 5/32″ | 0.15625 | 3.9688 |
| 11/64″ | 0.171875 | 4.3656 |
| 3/16″ | 0.1875 | 4.7625 |
| 13/64″ | 0.203125 | 5.1594 |
| 7/32″ | 0.21875 | 5.5562 |
| 15/64″ | 0.234375 | 5.9531 |
| 1/4″ | 0.25 | 6.3500 |
| 17/64″ | 0.265625 | 6.7469 |
| 9/32″ | 0.28125 | 7.1437 |
| 19/64″ | 0.296875 | 7.5406 |
| 5/16″ | 0.3125 | 7.9375 |
| 21/64″ | 0.328125 | 8.3344 |
| 11/32″ | 0.34375 | 8.7312 |
| 23/64″ | 0.359375 | 9.1281 |
| 3/8″ | 0.375 | 9.5250 |
| 25/64″ | 0.390625 | 9.9219 |
| 13/32″ | 0.40625 | 10.3187 |
| 27/64″ | 0.421875 | 10.7156 |
| 7/16″ | 0.4375 | 11.1125 |
| 29/64″ | 0.453125 | 11.5094 |
| 15/32″ | 0.46875 | 11.9063 |
| 31/64″ | 0.484375 | 12.3031 |
| 1/2″ | 0.5 | 12.7000 |
| 33/64″ | 0.515625 | 13.0969 |
| 17/32″ | 0.53125 | 13.4937 |
| 35/64″ | 0.546875 | 13.8906 |
| 9/16″ | 0.5625 | 14.2875 |
| 37/64″ | 0.578125 | 14.6844 |
| 19/32″ | 0.59375 | 15.0812 |
| 39/64″ | 0.609375 | 15.4781 |
| 5/8″ | 0.625 | 15.8750 |
| 41/64″ | 0.640625 | 16.2719 |
| 21/32″ | 0.65625 | 16.6687 |
| 43/64″ | 0.671875 | 17.0656 |
| 11/16″ | 0.6875 | 17.4625 |
| 45/64″ | 0.703125 | 17.8594 |
| 23/32″ | 0.71875 | 18.2562 |
| 47/64″ | 0.734375 | 18.6531 |
| 3/4″ | 0.75 | 19.0500 |
| 49/64″ | 0.765625 | 19.4469 |
| 25/32″ | 0.78125 | 19.8438 |
| 51/64″ | 0.796875 | 20.2406 |
| 13/16″ | 0.8125 | 20.6375 |
| 53/64″ | 0.828125 | 21.0344 |
| 27/32″ | 0.84375 | 21.4312 |
| 55/64″ | 0.859375 | 21.8281 |
| 7/8″ | 0.875 | 22.2250 |
| 57/64″ | 0.890625 | 22.6219 |
| 29/32″ | 0.90625 | 23.0187 |
| 59/64″ | 0.921875 | 23.4156 |
| 15/16″ | 0.9375 | 23.8125 |
| 61/64″ | 0.953125 | 24.2094 |
| 31/32″ | 0.96875 | 24.6062 |
| 63/64″ | 0.984375 | 25.0031 |
| 1″ | 1 | 25.4000 |
Every value is an exact binary fraction of an inch, so the decimals end within six places. Bold rows are eighths and quarters.
READING A RULE
Pick the precision you can hold.
Tape measures usually read to 1/16″, steel rules to 1/32″ or 1/64″. Rounding a print dimension of 0.3125 in to the nearest 1/16 gives 5/16 exactly; 0.3 in rounds to 5/16 with a 0.0125 in error, which matters for a hole but rarely for a cut length.
Working with drills? Compare fractional, number, letter and metric drills. Working with sheet? Convert gauge to mm.