Inches to Millimeters Converter
How to convert inches to millimeters
millimeters = inches × 25.4
To convert inches to millimeters, multiply the number of inches by 25.4.
1 in = 25.4 mm
Examples
- One foot: 12 in × 25.4 = 304.8 mm
- One yard: 36 in × 25.4 = 914.4 mm
Good to know
One inch is exactly 25.4 millimeters. Fractional inch sizes convert cleanly: 1/4 inch is 6.35 mm and 1/2 inch is 12.7 mm.
Inches to millimeters conversion table
| Inches (in) | Millimeters (mm) |
|---|---|
| 0.25 in | 6.35 mm |
| 0.5 in | 12.7 mm |
| 0.75 in | 19.05 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 |
| 8 in | 203.2 mm |
| 10 in | 254 mm |
| 12 in | 304.8 mm |
| 18 in | 457.2 mm |
| 24 in | 609.6 mm |
| 36 in | 914.4 mm |
| 48 in | 1,219.2 mm |
| 60 in | 1,524 mm |
| 72 in | 1,828.8 mm |
Unit definitions
- Inch (in)
- An inch is exactly 2.54 centimeters, one twelfth of a foot. It is used in the United States for everyday measurements and worldwide for screen sizes.
- Millimeter (mm)
- A millimeter is one thousandth of a meter. It is the usual unit for engineering drawings, hardware sizes and rainfall.