Convert Square Inch To Square Millimeter

Value to convert: 10 Square Inch
Conversion Factor: 1 Square Inch = 645.16 Square Millimeter
Calculate: 10 × 645.16 → 6451.6 Square Millimeter

Enter one or more values (use commas for multiple)

Decimals:

How to Convert Square Inch to Square Millimeter

Square Inch (in²)

A square inch (symbol: in²) is a unit of area equal to 1/144 of a square foot or approximately 6.45 square centimeters.

Square inches are commonly used in the US for measuring smaller areas such as paper, displays, and material cross-sections.

Square Millimeter (mm²)

A square millimeter (symbol: mm²) is a unit of area equal to 0.000001 square meters or one millionth of a square meter.

Square millimeters are used for very precise measurements of small areas in engineering, manufacturing, and scientific applications.