How many square millimeters in a square inch?
There are 645.16 square millimeters in a square inch. To convert square inches to square millimeters, multiply the square inch value by 645.16.
For example, to find out how many square millimeters in a square inch and a half, multiply 1.5 by 645.16, that makes 967.74 square millimeters in a square inch and a half.
1 Square Inch = 645.16 Square Millimeters
How many square inches in a square millimeter?
1 Square millimeter (mm²) is equal to 0.0015500031 square inch (in²). To convert square millimeters to square inches, multiply the square millimeters value by 0.0015500031 or divide by 645.16.
1 Square Millimeter = 0.0015500031 Square Inch
You may also use this area units conversion calculator to convert between square inches, square mm and all area measurement units.
What is a Square Inch?
Square inch is an imperial and United States Customary area unit and defined as a square with all sides are one inch in length. 1 in2 = 645.16 mm2. The symbol is "in²".
What is a Square Millimeter?
Square millimeter (millimetre) is a metric system area unit and defined as a square with all sides are one millimeter in length. The symbol is "mm²".