How is land measured?

How is land measured?

Land here in Thailand is measured in Rai, Ngan and Wah

*

1 rai = 4 ngan or 1600sqm
*

1 ngan = 100 wah or 400sqm
*

1 wah = 4sqm

So what does it all mean?

*

1 acre = 2.5 rai approx.
*

1 hectare = 6.25 rai approx.

The metric system is usually used in relation to the construction of buildings. Land prices are usually expressed/quoted in Baht per rai, or, for smaller plots Baht per wah.