Convert 1 square millimeter to square inch

1 mm² (square millimeter) is equal to 0.0015500031000061998 in² (square inch). To convert from square millimeter to square inch, multiply by 0.0015500031000061998 or divide by 645.1600000000001.

• 1 mm² × 0.0015500031000062 = 0.0015500031000062 in²
• 1 mm² ÷ 645.16 = 0.0015500031000062 in²