Convert Rai to Square Millimeter (rai → mm²)
The rai is the traditional Thai land unit, equal to 1,600 square meters, used in real estate and agriculture.
Rai to Square Millimeter Conversion Table
10 common values| Rai | Square Millimeter |
|---|---|
| 1 rai | 1,600,000,000 mm² |
| 5 rai | 8,000,000,000 mm² |
| 10 rai | 16,000,000,000 mm² |
| 50 rai | 80,000,000,000 mm² |
| 100 rai | 160,000,000,000 mm² |
| 500 rai | 800,000,000,000 mm² |
| 1,000 rai | 1,600,000,000,000 mm² |
| 5,000 rai | 8,000,000,000,000 mm² |
| 10,000 rai | 16,000,000,000,000 mm² |
| 50,000 rai | 80,000,000,000,000 mm² |
How to Convert Rai to Square Millimeter Manually
Step by StepConverting rais to square millimeters is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.
- 1Take your value in raisStart with the number of rais (rai) you want to convert.
- 2Multiply by 1,600,000,000The conversion factor from rai to mm² is 1,600,000,000. Multiply your value by this number.
- 3Read the result in square millimetersThe result is your value in square millimeters (mm²).
Formula
Multiply the value in rais by 1,600,000,000. For the reverse direction, multiply by 6.25 × 10^-10.
mm² = rai × 1,600,000,000rai = mm² × 6.25 × 10^-10Tips
Use these in everyday conversions- 1 rai = 1600 m² = 0.16 ha.
- 1 rai = 4 ngan = 400 tarang wa.
- 1 hectare = 6.25 rai.
Common Mistakes
Avoid these- Assuming rai equals hectare — only 16%.
- Mixing rai with ngan or tarang wa without conversion.
- Using rai outside Thailand — not internationally recognised.
About Rai and Square Millimeter
What is the Rai?
The rai equals exactly 1,600 square meters (40 m × 40 m) and is the traditional Thai land unit, still officially used in Thailand for real estate, agriculture, and property records. The rai is divided into 4 ngan (each 400 m²), and 1 ngan equals 100 wa (each 4 m²). Despite Thailand's adoption of the metric system, the rai remains the everyday unit for buying and selling land in Thai contexts — a small urban plot might be 1 rai, while rural farms are quoted in tens or hundreds of rai. The rai relates to the square meter (1 rai = 1,600 m²), the hectare (1 ha = 6.25 rai), and the acre (1 acre ≈ 2.529 rai). The rai's exact metric definition (1,600 m²) makes conversion to SI units precise, unlike many traditional land units.
- Thai rural property and farmland
- Thai real-estate listings
- Agricultural yield reporting in Thailand
A small Thai farm might be 10–20 rai (1.6–3.2 ha). Thai rice yields: 400–600 kg per rai.
What is the Square Millimeter?
The square millimeter equals one millionth of a square meter (10⁻⁶ m²) and is the precision area unit for electronics, microfabrication, mechanical engineering, and component cross-sections. Wire gauges in electronics specify cross-sectional area in mm² (a 2.5 mm² wire is standard for household lighting circuits). Computer chip die sizes and printed circuit board footprints are measured in mm². The square millimeter relates to the square centimeter (100 mm² = 1 cm²), the square meter (1,000,000 mm² = 1 m²), and the square inch (1 mm² ≈ 0.00155 in²). Engineering tolerances, microscope-image areas, and laser-spot sizes all use this scale. The square millimeter is critical in stress calculations: pressure (N/mm²) and strength (MPa) calculations in mechanical engineering routinely use this unit.
- Electrical cable cross-section (e.g. 2.5 mm² copper)
- Microelectronics and semiconductor areas
- Pharmaceutical tablet surface areas
Typical household wiring is 2.5 mm² copper. A grain of rice covers about 10 mm². A pin head is under 1 mm².