Thai Land Measurements | SunwayEstates

Thailand has its own system of area unit measurements. While metric system has been adopted for almost a century - since December 17th 1923 - traditional measurements are still widely used, especially when it comes to land. Here are the basics:

Tarang wah (square wah). Wah is a unit of length equal to 2 metres, so 1 square wah equals to 4 square meters.
Ngan. 1 ngan = 100 square wah = 400 sqm
Rai. 1 Rai = 4 ngan = 400 square wah = 1600 sqm

There is also a specific format used for land sizes, for example, when land size is stated as 2-1-10, it means: ‘2 Rai, 1 ngan, 10 sq. wah.’ (21600 + 1400 + 10*4 = 3640 sqm).

Here is a quick conversion guide:

Square Meters	Square Feet	Square Wah	Ngan	Rai	Acre	Hectare
1	10.76	0.25	0.0025	0.000625	0.00025	0.0001
4	43	1	0.01	0.0025	0.00099	0.0004
9.3	100	2.3	0.023	0.0058	0.00230	0.00093
10	108	2.5	0.025	0.00625	0.00247	0.001
93	1000	23	0.23	0.058	0.023	0.0093
100	1076	25	0.25	0.0625	0.025	0.01
400	4306	100	1	0.25	0.099	0.04
800	8611	200	2	0.5	0.198	0.08
929	10000	232	2.32	0.581	0.230	0.0929
1000	10764	250	2.5	0.625	0.247	0.1
1600	17222	400	4	1	0.395	0.16
2023	21780	506	5.06	1.265	0.5	0.2023
4047	43560	1012	10.12	2.529	1	0.4047
10000	107639	2500	25	6.25	2.47	1
100000	1076390	25000	250	62.5	24.71	10