Thailand adopted the metric system on 17 December 1923.Minutes of the 7th General Conference on Weights and Measures
1927, page 69 However, old Thai units are still in common use, especially for measurements of land. Before metrication, the traditional system of measurement used in

Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is bo ...

employed anthropic units. Some of these units are still in use, albeit standardised to SI/metric measurements. When the Royal Thai Survey Department began

cadastral survey Cadastral surveying is the sub-field of cadastre and surveying that specialises in the establishment and re-establishment of real property boundaries. It involves the physical delineation of property boundaries and determination of dimensions, a ...

in 1896, Director R. W. Giblin,

F.R.G.S. The Royal Geographical Society (with the Institute of British Geographers), often shortened to RGS, is a learned society and professional body for geography based in the United Kingdom. Founded in 1830 for the advancement of geographical scien ...

, noted, "It so happens that 40 metres or 4,000 centimetres are equal to one ''sen''," so all cadastral plans are plotted, drawn, and printed to a scale of 1:4,000. The square ''wa'', ''ngan'' and ''rai'' are still used in measurements of land area. The ''baht'' is still used as a unit of measurement in gold trading. However, one ''baht'' of 96.5% gold bullion is defined as 15.16 grams rather than the generic standard of 15 grams. The ''baht'' has also become the name of the currency of Thailand, which was originally fixed to the corresponding mass of silver.

List of units

References

{{systems of measurement

Customary units of measurement Units of measurement Thai culture