Inches to Millimeters (in to mm)
To convert inches to millimeters, multiply by 25.4. 1 in = 25.4 mm.
Formula
mm = in × 25.4
Example: Convert 12 in: 12 × 25.4 = 304.8 mm.
Inches to Millimeters chart
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 4 in | 101.6 mm |
| 5 in | 127 mm |
| 6 in | 152.4 mm |
| 7 in | 177.8 mm |
| 8 in | 203.2 mm |
| 9 in | 228.6 mm |
| 10 in | 254 mm |
| 12 in | 304.8 mm |
| 15 in | 381 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 30 in | 762 mm |
| 40 in | 1016 mm |
| 50 in | 1270 mm |
| 75 in | 1905 mm |
| 100 in | 2540 mm |
Frequently asked questions
How many millimeters is 1 inch?
1 inch (in) equals 25.4 millimeters (mm).
What is the formula to convert in to mm?
Multiply the value in inches by 25.4: mm = in × 25.4.
What is 12 in in millimeters?
12 inches equals 304.8 millimeters (12 in = 304.8 mm).
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