Unit rai
Category Area
Details Rai is a unit of area used in Thailand to measure land. It is a traditional unit that is still widely used in real estate, agriculture, and forestry in the country. One rai is equal to 1,600 square meters, or approximately 0.3954 acres. The rai is commonly used in conjunction with other traditional Thai area units, such as the ngan and the square wah. One rai is equivalent to 4 ngan or 400 square wah.