Property in Phuket

The Thai Land Measurement Units You Should Know

View of the sunset over the mountains in Phuket
Bird's eye view of farmlands

When looking into buying or leasing properties in Thailand, it’s important to remember these terms for measuring land—Wah, Ngan, and Rai. Why? It’s because Thailand has its own measurement system and does not use metric or imperial terms, which can be a little confusing if you’re not sure what numbers are being represented.

In Thailand, land measurements are often indicated in the Chanote or the land title deed certificate that legally certifies private land ownership, which is why it’s important to be acquainted with these terms. However, the Chanote is usually written in Thai numerals and will require translation into Arabic numerals. 

Wah can sometimes be spelt as Waa, Sqw, or indicated as square wah. Ngan on the other hand can sometimes be spelt as ngaan. For potential buyers, advertised properties are usually labelled in square wah or rai.

Here’s a quick breakdown of what the terms mean:

  • 1 wah = 2 metres
  • 1 square wah OR 1 tarang wah = 4 square metres
  • 1 ngan = 100 square wah OR 400 square metres
  • 1 rai = 4 ngan OR 400 square wah OR 1,600 square metres

To convert: 

  • 1 acre = 2.53 rai or 1,012 square wah or 4,047 square metres
  • 1 hectare = 6.25 rai or 2,500 square wah or 10,000 square metres

To put it simply:

  • 1 Wah = 4 m2 = 42.7 ft2
  • 1 Ngan = 100 Wah = 400 m2 4,277 ft2
  • 1 Rai = 400 Wah = 1,600 m2 =17,109 ft2
  • 1 Acre = 2.5 Rai = 4,000 m2= 42,772 ft2
  • 1 hectare = 6.25 Rai

These terms may initially be a little confusing, but the more you come across and use these terms, the better you’ll be acquainted with them.

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