Convert Square Chains to Rai
Convert Square Chains (ch²) to Rai (rai) instantly and accurately.
Conversion Formula
rai = ch² × 0.2529285264
About Square Chains
A square chain (ch²) is a surveying unit equal to the area of a square with sides of one Gunter's chain (66 feet or ~20.12 m), approximately 404.69 m². Ten square chains equal exactly one acre, making it the natural subdivision unit in traditional land surveying. The US Public Land Survey System used chains to lay out townships and sections, and square chains appear throughout old legal property descriptions and government land grants across North America. One square chain equals exactly 16 square rods.
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 Chains (ch²) | Rai (rai) |
|---|---|
| 1 ch² | 0.252929 rai |
| 2 ch² | 0.505857 rai |
| 5 ch² | 1.26464 rai |
| 10 ch² | 2.52929 rai |
| 25 ch² | 6.32321 rai |
| 50 ch² | 12.6464 rai |
| 100 ch² | 25.2929 rai |