Inches to Millimeters Converter
Convert in to mm instantly. 1 in = 25.4 mm.
Conversion Formula
mm = in × 25.4
Example
25 in × 25.4 = 635 mm
Convert the other way: Millimeters to Inches →
Inches to Millimeters Conversion Table
| Inches (in) | Millimeters (mm) |
|---|---|
| 0.1 | 2.54 |
| 0.5 | 12.7 |
| 1 | 25.4 |
| 2 | 50.8 |
| 5 | 127 |
| 10 | 254 |
| 20 | 508 |
| 25 | 635 |
| 50 | 1,270 |
| 100 | 2,540 |
| 500 | 12,700 |
| 1,000 | 25,400 |
About These Units
- Inches (in)
- Exactly 25.4 mm, fixed by the 1959 international yard and pound agreement. Inches measure TV and monitor screens and car and bicycle wheels worldwide, and remain the everyday small length unit in the United States.
- Millimeters (mm)
- One thousandth of a meter, exactly 0.001 m. Millimeters are the standard dimension on engineering drawings, and they also measure rainfall, drill bits, and jewelry, with 25.4 of them making one inch.
Frequently Asked Questions
How many mm are in 1 in?
1 in equals 25.4 mm.
How do I convert Inches to Millimeters?
Multiply your Inches value by 25.4. For example, 25 in × 25.4 = 635 mm.
How many in are in 1 mm?
1 mm equals 0.03937007874 in.