Inches to Millimeters converter
Convert inches (in) to millimeters (mm). Exact factor: 1 in = 25.4 mm.
Converter tool
Formula: mm = in × 25.4
Quick examples
| Inches | Millimeters |
|---|---|
| 0.5 | 12.7 |
| 1 | 25.4 |
| 2 | 50.8 |
| 4 | 101.6 |
| 6 | 152.4 |
| 8 | 203.2 |
| 10 | 254.0 |
| 12 | 304.8 |
How to convert Inches to Millimeters
Formula: mm = in × 25.4.
Reverse conversion: in = mm × 0.03937007874015748
Tip: Use the swap button to reverse the calculation instantly.
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Inches → Millimeters FAQs
What is the exact conversion factor?
Inches × 25.400000000000 = Millimeters.
How do I go the other way?
in = mm × 0.03937007874015748
Are the results rounded?
Calculations use exact constants; values are displayed with sensible rounding for readability.