Convert inches to millimeters and millimeters to inches instantly. Bidirectional length converter with formula and common values.
To convert inches to millimeters, multiply by 25.4. The international inch is defined as exactly 25.4 millimeters.
| Inches | Millimeters |
|---|---|
| 0.25 | 6.35 |
| 0.5 | 12.7 |
| 2 | 50.8 |
| 3.5 | 88.9 |
| 6 | 152.4 |
| 12 | 304.8 |
| 24 | 609.6 |
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One inch equals exactly 25.4 millimeters.
Multiply the number of inches by 25.4. For example, 3.5 in × 25.4 = 88.9 mm.
Since 1959, the international inch is defined as exactly 25.4 millimeters by agreement among English-speaking nations.
One millimeter equals approximately 0.03937 inches.