What are the Thai units of land measurement, and what do they equate to in UK measurements? Is it the Wah or Rai?

Any help appreciated.

What are the Thai units of land measurement, and what do they equate to in UK measurements? Is it the Wah or Rai?

Any help appreciated.

rai; 1600m2

wah;2m

sq.waa; 4m2

Here is all of it in case you need it later:

Area

1 sq wah = 4 sq meters

1 ngan (100 sq wah)= 400 sq meters

1 rai (4 ngan) =1600 sq meters

Weights

1 baht = 4 saleung

1 baht (gold) = 15 g

1 tamleung (4 baht) = 60 g

1 chang (20 tamleung) = 1.2 kg

1 harb (50 chang) = 60 kg

1 karat (diamond) = 20 centigram

Linear Measure

1 niu = 0.619 inch (English)

1 niu = 4 krabiad

1 keub (12 niu) = 9.54 inch or 25 cm

1 sawk (2 keub) = 50 cm

1 wah (4 sawk) = 2 m

1 sen (20 wah) = 40 m

1 yoht (400 sen) = 16km

Volumetric Measure

1 kwian (2 bun) = 2000 litre

1 bun (50 tung) = 1000 litre

1 tung = 20 litre

1 tananluang = 1 litre

1 yok (wood) = 17.78 sq ft