Convert Square Thou to Square Millimeters
Convert Square Thou (thou²) to Square Millimeters (mm²) instantly and accurately.
Conversion Formula
mm² = thou² × 0.00064516
About Square Thou
A square thou (thou²), sometimes called a square mil, is the area of a square with sides of one thousandth of an inch (0.0254 mm), equal to approximately 6.452 × 10⁻¹⁰ m². This tiny imperial unit is indispensable in precision engineering, PCB (printed circuit board) design, and manufacturing, where conductor widths, dielectric coating thicknesses, and tight machining tolerances are specified in thou. Wire insulation, thin films, and precision-stamped metal components are commonly described using this unit.
About Square Millimeters
A square millimeter (mm²) is a metric unit of area equal to a square with sides of one millimeter. It is commonly used in precision engineering, electronics, and measuring very small surfaces such as microchips or printed circuit boards. To visualise: a typical pinhead has an area of about 2-3 mm². This unit is essential in microscopy, medical imaging, and manufacturing where tiny, precise measurements are critical.
Quick Reference Table
| Square Thou (thou²) | Square Millimeters (mm²) |
|---|---|
| 1 thou² | 0.00064516 mm² |
| 2 thou² | 0.00129032 mm² |
| 5 thou² | 0.0032258 mm² |
| 10 thou² | 0.0064516 mm² |
| 25 thou² | 0.016129 mm² |
| 50 thou² | 0.032258 mm² |
| 100 thou² | 0.064516 mm² |