Rai (area)

A rai (Thai ไร่) is a unit of area, equal to 1,600 square metres (40 m × 40 m), used for measuring land area. Its current size is precisely derived from the metre, but is neither part of nor recognized by the modern metric system, the International System (SI).

The rai equals 4 ngaan or 400 tarangwa "aka" square waa.

It is commonly used in Thailand and equals 16 are, another unit based on the metre and as commonly used in several countries recognized though not encouraged by the SI.

References

*cite web
publisher=Thailand Guru, a service of Export Quality Services Co., Ltd
title=Units of Measurement
url=http://www.thailandguru.com/infra-time.html#units
accessdaymonth=15 April
accessyear=2007 (which uses the name 'waa' instead of 'dtaaraangwaa' for the 'square waa')
*cite web
publisher=Baan Thai Property Co. Ltd
title=Information and advice when buying property in Thailand (Land Sizes)
url=http://www.baanthaiproperty.com/info.php
accessdaymonth=15 April
accessyear=2007 (with spelling variant 'data-raang waa' for 'dtaaraangwaa')
*cite web
publisher=www.PureThailand.com
title=Thailand Information - Measurement
url=http://www.purethailand.com/thailand_information/misc/measurement.htm
accessdaymonth=15 April
accessyear=2007 (with spelling variants 'wah' and 'tara [a] ng wah' for 'waa' and 'dtaaraangwaa')

ee also

*1 E+3 m² for a comparison with other areas