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Convert inches (in) to millimeters (mm).
Convert inches to millimeters in one step. One inch equals 25.4 millimeters, so you multiply the number of inches by 25.4. Type in either box to convert both ways — the result updates instantly, entirely in your browser.
| Inches | Millimeters |
|---|---|
| 1 in | 25.4 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 25 in | 635 mm |
| 50 in | 1270 mm |
| 100 in | 2540 mm |
Tip: type in either box to convert both ways, tap a row to reuse it, or use the copy button. Runs entirely in your browser — nothing is uploaded.
Runs entirely in your browser — nothing is uploaded.
Multiply the number of inches by 25.4. For example, 1 inches × 25.4 = 25.4 millimeters.
One inch equals 25.4 millimeters.