How many square millimeters in a square inch?
1 Square inch (in²) is equal to 645.16 square millimeters (mm²). To convert square inches to square mm, multiply the square inch value by 645.16.
For example, to find out how many square mm in a square inch and a half, multiply 1.5 by 645.16, that makes 967.74 square mm 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 mm to square inches, multiply the square mm 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 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 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".