In Thailand, building plots or the total saleable area of a condominium are measured in a different method than most other countries. Measured in rai, nagn, wah or square meters, refer to the below chart to equate the differences.

1 square 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

Converting from metric:

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