Convert Square Inches to Square Thou
Convert Square Inches (in²) to Square Thou (thou²) instantly and accurately.
Conversion Formula
thou² = in² × 1000000
About Square Inches
A square inch (in²) is an imperial unit of area equal to a square with sides of one inch (25.4 mm × 25.4 mm). It is commonly used in the United States for measuring small areas like fabric swatches, screen sizes, or printed materials. A standard business card is about 6 in², and a typical smartphone screen might be 15-20 in². This unit remains prevalent in American manufacturing, printing, and retail.
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.
Quick Reference Table
| Square Inches (in²) | Square Thou (thou²) |
|---|---|
| 1 in² | 1000000 thou² |
| 2 in² | 2000000 thou² |
| 5 in² | 5000000 thou² |
| 10 in² | 10000000 thou² |
| 25 in² | 25000000 thou² |
| 50 in² | 50000000 thou² |
| 100 in² | 100000000 thou² |