Convert Fractional inches to Millimeters — Woodworking
Formula
mm = (fraction as decimal inches) × 25.4 e.g. 3/4" = 19.05 mm
Why this matters in woodworking
Tape measures read in fractions (1/16, 1/8, 3/4). Enter the fraction directly; it is converted to decimal inches, then to millimeters at 25.4 mm/in.
Fractional inches to Millimeters reference table
| Fractional inches (in) | Millimeters (mm) |
|---|---|
| 1/16 | 1.588 |
| 1/8 | 3.175 |
| 3/16 | 4.762 |
| 1/4 | 6.35 |
| 3/8 | 9.525 |
| 1/2 | 12.7 |
| 5/8 | 15.875 |
| 3/4 | 19.05 |
| 7/8 | 22.225 |
| 1 | 25.4 |