Length
inches to mm Converter
1 in = 25.4 mm. Enter any value and the result updates instantly.
Convert
How to convert inches to mm
- Type the inches value in the calculator.
- Keep inches selected as the from unit and mm selected as the to unit.
- Use the instant result, or copy it with the copy button.
inches to mm chart
| inches | mm |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 25 in | 635 mm |
| 50 in | 1,270 mm |
| 100 in | 2,540 mm |
Formula
mm = in x 25.4
Example: 1 in = 25.4 mm.
Source
SI meter definitions and exact international inch, foot, yard, and mile relationships.
Common questions
How do I convert inches to mm?
Enter the inches value in the converter, or multiply by the factor shown in the formula. 1 in = 25.4 mm.
What is 1 in = 25.4 mm?
1 in = 25.4 mm. The chart on this page gives more common inches to mm values.
Where does this length conversion come from?
SI meter definitions and exact international inch, foot, yard, and mile relationships. ConverterBase uses stable definitions and fixed conversion factors, not live or rounded market data.