The rai, [lower-alpha 1] ngan, [lower-alpha 2] and tarang wa or square wa [lower-alpha 3] are customary Thai units of area, used in the measurement of land. They are defined as exactly 1,600, 400, and 4 square metres, respectively (17,222, 4,306, and 43 sq ft). [1]
The tarang wa (square wa, tarang meaning 'grid') is derived from the area of a square with sides of 1 wa (the Thai fathom). One ngan ('work') is equal to 100 square wa, and one rai ('field' or 'plantation') equals 4 ngan or 1 square sen . [1] The units were standardized in square metres when Thailand (then Siam) adopted the metric system in 1923, [2] [3] although the Royal Survey Department was already reported in 1908 to be using the metre-based conversion for its cadastral maps. [4]
The units are commonly used for cadastre and property matters, and official and legal documents express areas of land in such units. [5] They are sometimes notated in the abbreviated format rai-ngan-tarang wa, e.g. "4-2-25 rai", which means "4 rai, 2 ngan, and 25 tarang wa", though this is discouraged by some government documents. [6]
Unit | Derivation | Relative | SI (or other metric) | US or UK customary |
---|---|---|---|---|
Tarang wa | Square wa | 4 m2 | 43 sq ft | |
Ngan | 100 tarang wa | 400 m2 | 4,306 sq ft | |
Rai | Square sen | 4 ngan or 400 tarang wa | 1,600 m2 (16 ares) | 17,222 sq ft (0.4 acres) |
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