Convert Rai to Square Micrometers
Convert Rai (rai) to Square Micrometers (μm²) instantly and accurately.
Conversion Formula
μm² = rai × 1.600000000e+15
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.
About Square Micrometers
A square micrometer (μm²), also called a square micron, equals one trillionth of a square meter - the area of a square with sides one millionth of a meter (10⁻¹² m²). This is the natural scale of biological cells: a human red blood cell has a surface area of about 135 μm², and a typical bacterium might occupy 2-10 μm². Square micrometers are the standard unit in cell biology, histology, microscopy, and semiconductor characterisation where individual features on wafers are measured.
Quick Reference Table
| Rai (rai) | Square Micrometers (μm²) |
|---|---|
| 1 rai | 1.6 × 1015 μm² |
| 2 rai | 3.2 × 1015 μm² |
| 5 rai | 8 × 1015 μm² |
| 10 rai | 1.6 × 1016 μm² |
| 25 rai | 4 × 1016 μm² |
| 50 rai | 8 × 1016 μm² |
| 100 rai | 1.6 × 1017 μm² |