Convert Square Inch (in²) to Square Millimeter (mm²)

Convert Square Inch (in²) to Square Millimeter (mm²) online. Get fast, accurate conversions between imperial and metric units effortlessly.

Formula: To convert square inches to square millimeters, multiply the area value in square inches by 645.16.
Square Inch (in²)
A unit of area used in the imperial system, equal to a square with 1-inch sides.
Square Millimeter (mm²)
A unit of area measurement equal to a square with 1 mm on each side.

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