Convert inches to millimeters
Enter a inches value below and convert to millimeters
in
1 inch =
25.4 millimeters
* exact result
Select how many decimal places the result will be rounded to:
How to convert inches to millimeters
To convert inches to millimeters, multiply a inches value by 25.4.
Formula mm = in × 25.4
Example: Convert 2.5 inches to millimeters Calculations: 2.5 in × 25.4 = 63.5 mm
Inch (in)
The inch is a unit of length in the imperial system, useful in providing precise measurements of small items. It is equal to 1/12 of a foot, or 25.4 millimeters.
Millimeter (mm)
The millimeter is a unit of length equal to 1/1000 of a meter, or about 0.03937 inches. It is used for precise measurements across various fields, such as engineering and construction.