Inches to millimeters (in to mm)
Type a value in inches and get the result in millimeters instantly — with the exact factor, a step-by-step formula and a table of common values.
Sources: NIST — Guide to the SI, Appendix B.8 (conversion factors: inch, foot, yard, mile)
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How to convert inches to millimeters
1 in = 25.4 mm
1 mm = 0.03937008 in
To convert inches to millimeters, multiply the value by 25.4.
Example: 1 in × 25.4 = 25.4 mm.
Inches to millimeters conversion table
| Inches (in) | Millimeters (mm) |
|---|---|
| 0.1 | 2.54 |
| 0.25 | 6.35 |
| 0.5 | 12.7 |
| 0.75 | 19.05 |
| 1 | 25.4 |
| 2 | 50.8 |
| 3 | 76.2 |
| 5 | 127 |
| 10 | 254 |