Convert Rai to Square Kilometers
Convert Rai (rai) to Square Kilometers (km²) instantly and accurately.
Conversion Formula
km² = rai × 0.0016
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 Kilometers
A square kilometer (km²) is a metric unit of area equal to a square with sides of one kilometer (1,000 m × 1,000 m). It is used for measuring large land areas such as cities, forests, lakes, and countries. Manhattan (New York) is about 59 km², and Monaco (the second smallest country) is just over 2 km². This unit is essential in geography, urban planning, forestry, and environmental impact studies.
Quick Reference Table
| Rai (rai) | Square Kilometers (km²) |
|---|---|
| 1 rai | 0.0016 km² |
| 2 rai | 0.0032 km² |
| 5 rai | 0.008 km² |
| 10 rai | 0.016 km² |
| 25 rai | 0.04 km² |
| 50 rai | 0.08 km² |
| 100 rai | 0.16 km² |