How to convert inches to millimeters
To convert inches to millimeters, multiply the number of inches by 25.4. That is because 1 in = 25.4 mm. For example, 10 in = 254 mm.Enter any value in the box above and the answer updates instantly, no sign-up and nothing leaves your browser.
Inch to Millimeter conversion table
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 50 in | 1,270 mm |
| 100 in | 2,540 mm |
| 1,000 in | 25,400 mm |
Frequently asked questions
How many millimeters in a inch?
1 in = 25.4 mm. So 1 inch equals 25.4 millimeters.
What is the in to mm formula?
Inches × 25.4 = Millimeters.
Does it work in reverse?
Yes. Use the Millimeter to Inch converter to go the other way.
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