Convert Inches to Millimeters — Machining & CNC
Formula
mm = inches × 25.4
Why this matters in machining & cnc
Base imperial-to-metric conversion for drawings, tooling, and DRO readouts.
Inches to Millimeters reference table
| Inches (in) | Millimeters (mm) |
|---|---|
| 0.001 | 0.0254 |
| 0.01 | 0.254 |
| 0.1 | 2.54 |
| 0.25 | 6.35 |
| 0.5 | 12.7 |
| 1 | 25.4 |
| 2 | 50.8 |
| 4 | 101.6 |
| 6 | 152.4 |
| 12 | 304.8 |
More machining & cnc converters
- Thou (mils) → Millimeters mm = thou × 0.0254 (1 thou = 0.001 in)
- Surface feet per minute → Spindle RPM RPM = (SFM × 12) ÷ (π × diameter_in) [diameter defaults to 1.0 in]
- Threads per inch → Thread pitch pitch(mm) = 25.4 ÷ TPI