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Condominiums, Houses and Land measurements are usually referred to in Square Metres, (Sq.m). The measurements Rai, Wah and Ngan are Thai-land measurements. They are still used locally by Thai people when listing Land and property for sale but in the mainstream Square Metres is the common choice.
Land in Thailand is measured in Rai, Ngan and Wah. Please find below some conversions from Thai-land measurements into what most of the Western World are more familiar with.
1 Rai = 4 Ngan Or 1600 Squared Metres
1 Ngan = 100 Wah or 400 Squared Metres
1 Wah = 4 Squared Metres
1 Acre = 2.5 Rai (Approximately)
1 Hectare = 6.25 Rai (Approximately)