How many square millimeter in 1 sq. in? The answer is 645.16. We assume you are converting between square millimetre and square inch. You can view more details on each measurement unit: square millimeter or sq. in The SI derived unit for area is the square meter. 1 square meter is equal to 1000000 square millimeter, or 1550.0031000062 sq. in. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between square millimeters and square inches. Type in your own numbers in the form to convert the units!
1 square millimeter to sq. in = 0.00155 sq. in
10 square millimeter to sq. in = 0.0155 sq. in
50 square millimeter to sq. in = 0.0775 sq. in
100 square millimeter to sq. in = 0.155 sq. in
200 square millimeter to sq. in = 0.31 sq. in
500 square millimeter to sq. in = 0.775 sq. in
1000 square millimeter to sq. in = 1.55 sq. in
You can do the reverse unit conversion from sq. in to square millimeter, or enter any two units below:
A square inch is by definition the area enclosed by a square with sides each 1 inch long.
ConvertUnits.com provides an online conversion calculator for all types of measurement units. You can find metric conversion tables for SI units, as well as English units, currency, and other data. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types. Examples include mm, inch, 70 kg, 150 lbs, US fluid ounce, 6'3", 10 stone 4, cubic cm, metres squared, grams, moles, feet per second, and many more!