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Square inches to square millimeters (in² to mm²) Metric conversion calculator

Welcome to our square inches to square millimeters (in² to mm²) conversion calculator. You can enter a value in either the square inches or square millimeters input fields. For an understanding of the conversion process, we include step by step and direct conversion formulas. If you'd like to perform a different conversion, just select between the listed Area units in the 'Select between other Area units' tab below or use the search bar above. Tip: Use the swap button to switch from converting square inches to square millimeters to square millimeters to square inches.

square inches (in²)

 

square millimeters (mm²)

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1 in² = 645.16 mm² 1 mm² = 0.00155 in²

Algebraic Steps / Dimensional Analysis Formula
in² * 6.4516 cm²
1 in²		 * 100 mm²
1 cm²		 = mm²

Direct Conversion Formula
in² * 645.16 mm²
1 in²		 = mm²

acres 0
hectares 0
square feet 0
square kilometers 0
square meters 0
square miles 0
square yards 0
If you would like to switch between Area units, select from the tables below

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