Inches to Millimeters
1 inch = 25.4 millimeters. Type any value below for an instant conversion.
Enter a value to convert.
How to convert inches to millimeters
Multiply the inch value by 25.4:
millimeters = inches × 25.4
Example: 10 in × 25.4 = 254 mm. Going the other way, divide by 25.4 (or multiply by 0.03937) — or use our millimeters to inches converter.
Conversion table
| Inches | Millimeters |
|---|---|
| 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 |
| 30 in | 762 mm |
| 50 in | 1,270 mm |
| 100 in | 2,540 mm |
| 150 in | 3,810 mm |
| 170 in | 4,318 mm |
| 180 in | 4,572 mm |
| 200 in | 5,080 mm |
| 500 in | 12,700 mm |
| 1,000 in | 25,400 mm |
About these units
Inch (in) and millimeter (mm) are both units of length. Metric units (millimeters, centimeters, meters, kilometers) are used almost worldwide, while inches, feet, yards, and miles remain standard in the United States.
Need a different pair? Try the full unit converter.
Related: Centimeters to inches · Inches to centimeters · Centimeters to feet · Feet to centimeters · Meters to feet · Feet to meters