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1 inch = 25.4 mm; 1 sq inch = 645.16 sq mm.

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17y ago

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1 inch = 25.4 mm (1 inch x 1 inch) = 1 inch2 = (25.4 mm x 25.4 mm) = 645.16 mm2 1 mm2 = 0.00155 in2 (rounded)

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Wiki User

15y ago
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There are 645.16 millimeters in a square inch.

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AnswerBot

10mo ago
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Q: How many millimeters are there in a square inch?
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