Converting Rai and Wah can be complicated of the top of your head. This can cause legal issues when people do not understand what it is that they are signing in the contract. You want to ensure that you understand what you are buying. You want to make sure you are buying the right size property or land. Below are some basic land conversion in the land measurement system in Thailand. Thailand does not have an Imperial or Metric system. 

• Rai: a unit of area measurement used in Thailand – 1 Rai = 4 Ngan (or 1600 sq. m.)
• Ngan: a unit of area measurement used in Thailand, equal to 1/4 Rai
• Wah: a unit of length or area measurement used in Thailand, equal to 4 square meters
• Acre: a unit of area measurement commonly used in the United States and some other countries, equal to approximately 4047 square meters or 43,560 square feet
• Hectare: a unit of area measurement commonly used in many countries worldwide, equal to 10,000 square meters or approximately 2.471 acres
• Square meter: a unit of area measurement, commonly used in many countries worldwide
• Square feet: a unit of area measurement, commonly used in the United States and some other countries.