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Inches to Millimeters
Type a value in either box. 1 in = 25.4 mm.
How to convert inches to millimeters
1 in = 25.4 mm, and 1 mm = 0.03937007874 in. To convert inches to millimeters, use:
mm = in × 25.4
Example: convert 12 in to millimeters: 12 × 25.4 = 304.8, so 12 in = 304.8 mm.
Good to know
Multiply by 25.4 for an exact answer. Rainfall is a common use: 1 inch of rain is 25.4 mm.
Inches to Millimeters chart
| Inches (in) | Millimeters (mm) |
|---|---|
| 0.1 in | 2.54 mm |
| 0.25 in | 6.35 mm |
| 0.5 in | 12.7 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 | 1,016 mm |
| 50 in | 1,270 mm |
| 75 in | 1,905 mm |
| 100 in | 2,540 mm |
| 250 in | 6,350 mm |
| 500 in | 12,700 mm |
| 1,000 in | 25,400 mm |
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