Convert Square Thou to Rai
Convert Square Thou (thou²) to Rai (rai) instantly and accurately.
Conversion Formula
rai = thou² × 4.032250000e-13
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 Rai
A rai (ไร่) is the standard Thai unit of land area, defined as exactly 1,600 m² (40 m × 40 m). It is used throughout Thailand for all land measurement - from rice paddies to urban plots and national parks. Thai real estate listings always quote land area in rai, ngan (400 m² = ¼ rai), and talang wah (4 m² = 1 square wah). Thailand's total rice-paddy area is reported in millions of rai. One rai equals approximately 0.395 acres or 0.16 hectares.
Quick Reference Table
| Square Thou (thou²) | Rai (rai) |
|---|---|
| 1 thou² | 4.032 × 10-13 rai |
| 2 thou² | 8.064 × 10-13 rai |
| 5 thou² | 2.016 × 10-12 rai |
| 10 thou² | 4.032 × 10-12 rai |
| 25 thou² | 1.008 × 10-11 rai |
| 50 thou² | 2.016 × 10-11 rai |
| 100 thou² | 4.032 × 10-11 rai |