Fractional inches to millimeters
Type a value in in (fraction) to get it in mm instantly.
5.159mm
That's 1.01× as wide as the tap drill for 1/4-20 (#7), while the tap drill for 5/16-18 (F) is 1.27× wider.
Convert the other way: mm to in (fraction)
What it means
How wide is that hole?
Sizes from ASME B94.11M. Between two listed drills the label shows the nearest one; the millimeters are exact.
The math
How to convert in (fraction) to mm
Number and letter drills are a table: #29 = 0.1360 in = 3.454 mm, #7 = 0.2010 in, F = 0.2570 in. Millimeters = inches × 25.4.
Example: 13/64 in (fraction) = 5.15938 mm.
Every unit
That drill in every system
Tables
in (fraction) to mm conversion table
| in (fraction) | mm |
|---|---|
| 1/64 in (fraction) | 0.396875 mm |
| 1/32 in (fraction) | 0.79375 mm |
| 3/64 in (fraction) | 1.19062 mm |
| 1/16 in (fraction) | 1.5875 mm |
| 3/32 in (fraction) | 2.38125 mm |
| 7/64 in (fraction) | 2.77812 mm |
| 1/8 in (fraction) | 3.175 mm |
| 9/64 in (fraction) | 3.57188 mm |
| 5/32 in (fraction) | 3.96875 mm |
| 3/16 in (fraction) | 4.7625 mm |
| 13/64 in (fraction) | 5.15938 mm |
| 7/32 in (fraction) | 5.55625 mm |
| 15/64 in (fraction) | 5.95313 mm |
mm to in (fraction) conversion table
| mm | in (fraction) |
|---|---|
| 0.343 mm | ≈1/64 in (fraction) |
| 0.711 mm | ≈1/32 in (fraction) |
| 1.02 mm | ≈3/64 in (fraction) |
| 1.78 mm | ≈1/16 in (fraction) |
| 2.26 mm | ≈3/32 in (fraction) |
| 2.49 mm | ≈3/32 in (fraction) |
| 2.71 mm | ≈7/64 in (fraction) |
| 2.87 mm | ≈7/64 in (fraction) |
| 3.26 mm | ≈1/8 in (fraction) |
| 3.45 mm | ≈9/64 in (fraction) |
| 3.8 mm | ≈5/32 in (fraction) |
| 4.04 mm | ≈5/32 in (fraction) |
| 4.09 mm | ≈5/32 in (fraction) |
| 4.57 mm | ≈3/16 in (fraction) |
| 4.91 mm | ≈3/16 in (fraction) |
| 5.11 mm | ≈13/64 in (fraction) |
| 5.22 mm | ≈13/64 in (fraction) |
| 5.41 mm | ≈7/32 in (fraction) |
| 5.79 mm | ≈15/64 in (fraction) |
Quick answers
Quick answers
- How many mm is 1 in (fraction)?
- 1 in (fraction) is 25.4 mm.
- How many mm is 10 in (fraction)?
- 10 in (fraction) is 254 mm.
- How many mm is 13/64 in (fraction)?
- 13/64 in (fraction) is 5.15938 mm.
The units
About these units
Fractional inches (in (fraction))
The nearest 64th of an inch; ≈ marks a size that falls between marks.
Millimeters (mm)
The diameter in millimeters, as metric drills are sold.
Keep going