Thailand adopted the metric system on 17 December 1923.
[1] Before metrication, the traditional system of measurement used in Thailand employed anthropic units.
When the Royal Thai Survey Department began cadastral survey in 1896, Director R. W. Giblin, F.R.G.S., 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.
[2] The square wa, ngan and rai are still used in measurements of land area.
The baht has also become the name of the currency of Thailand, which was originally fixed to the corresponding mass of silver.