Convert Rai to Square Millimeters
Convert Rai (rai) to Square Millimeters (mm²) instantly and accurately.
Conversion Formula
mm² = rai × 1600000000
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 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
| Rai (rai) | Square Millimeters (mm²) |
|---|---|
| 1 rai | 1.6 × 109 mm² |
| 2 rai | 3.2 × 109 mm² |
| 5 rai | 8 × 109 mm² |
| 10 rai | 1.6 × 1010 mm² |
| 25 rai | 4 × 1010 mm² |
| 50 rai | 8 × 1010 mm² |
| 100 rai | 1.6 × 1011 mm² |