In Thailand, land is typically measured in Rai, Ngan, and Wah. One Rai is equivalent to 1,600 square meters, or about 0.4 acres. One Ngan is equivalent to 400 square meters, and one Wah is equivalent to 4 square meters.
For smaller plots of land, the measurement is often given in square meters. However, for larger plots of land or for real estate transactions, the measurement is usually given in Rai. This system of measurement is commonly used throughout Thailand and is widely recognized in the real estate industry.
It's important to be clear on the size of a plot of land before making a purchase, as the measurement given can affect the price of the property. A professional real estate agent or lawyer can assist with ensuring that the correct measurement is used in a real estate transaction.