Convert Inches to Millimeters
1 in = 25.4 mm. Enter a value to convert.
Inches to Millimeters formula
mm = in × 25.4
Inches to Millimeters conversion table
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 3 | 76.2 |
| 4 | 101.6 |
| 5 | 127 |
| 10 | 254 |
| 20 | 508 |
| 25 | 635 |
| 50 | 1270 |
| 100 | 2540 |
| 250 | 6350 |
| 500 | 12700 |
| 1000 | 25400 |
How to convert inches to millimeters
- 01 Enter your value in the inch field above.
- 02 The result in millimeters appears instantly.
- 03 Use ⇄ to reverse, or pick any other length unit.
Frequently asked questions
How many millimeters are in a inch?
1 inch equals 25.4 millimeters. To convert, multiply the number of inches by 25.4.
What is the formula to convert inches to millimeters?
Use mm = in × 25.4.
Is this inch to millimeter converter free?
Yes. It's completely free, needs no signup, and runs entirely in your browser.