Square inches to square millimeters conversion table shows the most common values for your quick reference. Also, you may use the converter to convert any other values. If scroll down, you may also create and print your own custom conversion table create your table.
1 Sq. Inch = 645.16 Sq. Millimeters
Sq. millimeter is an area unit in metric system and used rarely. Commonly spelled as
"square millimetre" in many countries. The abbreviations are "mm2" or "sq mm".
Sq. inch is an imperial, U.S. customary area unit. The abbreviations are "sq in" and "in2".
For other area unit conversions, please go to Area Conversion