The metric system was officially introduced by a law passed on 17 December 1923. However, old Thai units are still in common use, especially for measurements of land which is often quoted using the traditional Thai system of wah, Ngaan and Rai. In the provinces, old times will occasionally use the traditional Thai system of weights and measurements. Here are some conversions:
Thailand units are used to measure Land Area.
Find Lands For Sale in Thailand

For Sale
7 Rai Land For Sale in Nong kham, Sri Racha, Chonburi
Property Code MGP943
Purple Area Land, Land Size 7-0-66 Rai-Ngan-Sq.wah (11,464 Sqm)
Sui...
Land For Sale in Nong kham, Sri Racha, Chonburi
Nong Kham, Si Racha, Chon Buri, Thailand For Sale ฿32,242,500
Property type: Land 11464 Sqm 7-0-66 Rai-Ngan-Sq.w District: Sri Racha Province/City: Chon Buri

For Sale
Land For Sale in Soi Pridi Sukhumvit 71
Property Code MGP910
Land Size 101 Sq.wah
Located at Soi Pridi Sukhumvit 71, Khwaeng Phra Khanong Nuea...
Land For Sale in Pridi Sukhumvit 71
Sukhumvit 71 Rd, Phra Khanong, Khet Watthana, Krung Thep Maha Nakhon 10110 For Sale ฿30,000,000
Property type: Land 404 Sqm 0-1-01 Rai-Ngan-Sq.w District: Watthana Province/City: Bangkok BTS Phra Khanong

For Sale
45 Rai Land For Sale in Wang Noi, Ayutthaya
Property Code MGP903
Land Size 45-2-40 Rai-Ngan-Sq.wah
Green Color Area but can make factory
Wi...
Land For Sale in Wang Noi, Ayutthaya
Sananp Thuep, Wang Noi District, Phra Nakhon Si Ayutthaya 13170 For Sale ฿54,720,000
Property type: Land 72960 Sqm 45-2-40 Rai-Ngan-Sq.w District: Wang Noi Province/City: Ayutthaya

For Sale
Land For Sale on Thung Klom -Tan Man 29 Road, Bang Lamung, Chon Buri
Property Code MGP860
Land Size 15-2-88 Rai (6288 Sq.wah)
Thanon Thung Klo...
Land Thung Klom -Tan Man 29 Rd, Bang Lamung
Thanon Thung Klom-Tan Man 29, Pattaya City, Bang Lamung District, Chon Buri 20150, Thailand For Sale ฿314,000,000
Property type: Land 21152 Sqm 15-2-88 Rai-Ngan-Sq.w District: Bang Lamung Province/City: Chon Buri

For Sale
Land for sale Hub Bon, Khao Khan Song, Sri Racha, Chon Buri
Property Code MGP859
Have 3 Title deeds
Total Land Size 18-3-13 Rai (7515 Sq.wah)
...
Land for sale Hub Bon, Khao Khan Song, Sri Racha
For Sale ฿46,956,250
Property type: Land 30052 Sqm 18-3-13 Rai-Ngan-Sq.w District: Si Racha Province/City: Chon Buri

For Sale
Land for Sale near Rawai Beach Phuket
Property Code MGP858
Land Size 1-2-19 Rai (619 Sq.wah)
Just 180 Meters from the beach
Corner Plot
...
Land for Sale near Rawai Beach Phuket
Soi Rouyphad, Tambon Rawai, Amphoe Mueang Phuket, Chang Wat Phuket 83100 For Sale ฿69,000,000
Property type: Land 2476 Sqm 1-2-19 Rai-Ngan-Sq.w District: Mueang Phuket Province/City: Phuket

For Sale
Land For Sale Na Chom Thian, Sattahip, Chon Buri
Property Code MGP857
Land Size 7-1-37 (2937 Sq.wah)
Located on Main Road 70 Meters Wide 150 M...
Land For Sale Na Chom Thian, Sattahip, Chonburi
3 Na Chom Thian, Sattahip District, Chon Buri 20250, Thailand For Sale ฿734,250,000
Property type: Land 11748 Sqm 7-1-37 Rai-Ngan-Sq.w District: Sattahip Province/City: Chon Buri

For Sale
Land For Sale in Jomtien Chonburi
Property Code MGP855
Land Size 5-0-55 Rai (2055 Sq.wah)
Located at Jomtien Second Road, Muang Pattaya, Ampho...
Land For Sale in Jomtien Chonburi
Jomtien Second Road, Pattaya City, Bang Lamung District, Chon Buri, Thailand For Sale ฿513,750,000
Property type: Land 5-0-55 Rai-Ngan-Sq.w District: Bang Lamung Province/City: Chon Buri

For Sale
Land For Sale in Soi Inthamara 47 Ratchadaphisek Road
Property Code MGP848
Land Size 107 Sq.wah
Located at Ratchadaphisek Road, Soi Inthamara ...
Land Soi Inthamara 47 Ratchadaphisek Road
325/1 Ratchadaphisek Rd, Khwaeng Din Daeng, Khet Din Daeng, Krung Thep Maha Nakhon 10400, Thailand For Sale ฿22,000,000
Property type: Land 428 Sqm 0-1-7 Rai-Ngan-Sq.w District: Din Daeng Province/City: Bangkok

For Sale
Land For Sale Rama 9 Soi 41
Property Code MGP846
Land Size 150 Sq.wah
Located on Rama 9 Soi 41 Road, Khwaeng Suan Luang, Khet Suan Luang, Bang...
Land For Sale Rama 9 Soi 41 Suan Luang
Rama 9 Soi 41 Suan Luang, Bangkok, Thailand For Sale ฿36,000,000
Property type: Land 600 Sqm 0-1-50 Rai-Ngan-Sq.w District: Suan Luang Province/City: Bangkok

For Sale
Land For Sale on Sutthisan Winitchai Rd
Property Code MGP818
Land size 1 Ngan 5 Sq.wah(105 Sq.wah.)
Width 14 meters Depth 30 meters
6 meter...
Land For Sale on Sutthisan Winitchai Rd
Sutthisan Winitchai Rd, Din Daeng, Bangkok 10400, Thailand For Sale ฿19,000,000
Property type: Land 0-1-5 Rai-Ngan-Sq.w District: Din Daeng Province/City: Bangkok

For Sale
Land For Sale in Si Racha, Chon Buri
Property Code MGP739
Land Size 30-2-31 Rai-Ngan-Sq.wah
Price 3,200,000.THB/Rai
Located at Bueng, Si Ra...
30 Rai Land for Sale in Si Racha Chonburi
Bueng, Si Racha District, Chon Buri 20230, Thailand For Sale ฿97,848,000
Property type: Land 52124 Sqm 30-2-31 Rai-Ngan-Sq.w District: Si Racha Province/City: Chon Buri
Find House For Sale in Thailand

For Sale
Single House For Sale in Ekkamai 12
Property Code MGP917
4 Bedrooms 4 Bathrooms, Living Area 400 Sqm
Land Size 100 Sq.wah, 2 Floors, 5 Car Par...
Single House For Sale in Ekkamai 12
Ekkamai 12 Alley, Khlong Tan Nuea, Watthana, Bangkok, Thailand For Sale ฿55,000,000
Property type: Single House 4 4 400 Sqm 0-1-0 Rai-Ngan-Sq.w District: Watthana Province/City: Bangkok BTS Ekkamai

For Sale
Single House For Sale in Nuanchan
Property Code MGP921
5 Bedrooms 8 Bathrooms, Living Area 1544 Sqm
Land Size 386 Sq.wah, 2 Floors, 10 Car Par...
Single House For Sale Nuanchan
Nuan Chan Alley, Nuanchan, Bueng Kum, Bangkok 10230, Thailand For Sale ฿100,000,000
Property type: Single House 5 6+ 1544 Sqm 0-3-86 Rai-Ngan-Sq.w District: Bueng Kum Province/City: Bangkok

For Sale
I-Nine Phaholyothin Single House
3 Storey Detached House For Sale
Property Code MGP916
4 Bedrooms 5 Bathrooms, Living Area 390 Sqm
Land Siz...
I-Nine Phaholyothin
I-NINE Phahonyothin, Inthamara 9 Alley, Samsen Nai, Phaya Thai, Bangkok, Thailand For Sale ฿36,900,000
Property type: Single House 4 5 390 Sqm 0-0-46 Rai-Ngan-Sq.w District: Phaya Thai Province/City: Bangkok

For Sale
Grand Canal Prachachuen
4 Bedrooms Single House for Sale
Property Code MGP135
4 Bedrooms 5 Bathrooms, Living Area 900 Sqm
3 Floors, Land Si...
Grand Canal Prachachuen
Grand Canal Prachachuen, Bang Talat, Pak Kret District, Nonthaburi, Thailand For Sale ฿40,000,000
Property type: Single House 4 5 900 Sqm 0-1-62 Rai-Ngan-Sq.w District: Pak Kret Province/City: Nonthaburi

For Sale
Prukpirom Regent Village Rama 2
Single House For Sale
Property Code MGP901
5 Bedrooms 4 Bathrooms, Living Area 540 Sqm
Land Size 174 Sq.wah...
Prukpirom Regent Village Rama 2
99 Rama 2 Road, Samae Dam, Bang Khun Thian, Bangkok 10150, Thailand For Sale ฿26,900,000
Property type: Single House 5 4 540 Sqm 0-1-74 Rai-Ngan-Sq.w District: Bang Khun Thian Province/City: Bangkok

For Sale
Perfect Place Pattanakarn - Srinakarin
3 Bedroom House For Sale
Property Code MGP886
3 Bedrooms 3 Bathrooms, Living Area 175 Sqm
Land Size ...
Perfect Place Pattanakarn - Srinakarin
Perfect Place Pattanakarn - Srinakarin, On Nut 80 Yaek 5, Prawet, Bangkok, Thailand For Sale ฿8,100,000
Property type: Single House 3 3 175 Sqm 0-0-54.7 Rai-Ngan-Sq.w District: Prawet Province/City: Bangkok

For Sale
Single House For Sale in Pridi Banomyong Alley 15
Property Code MGP878
4 Bedrooms 4 Bathrooms, Living Area 450 Sqm
Land Size 97 Sq.wah, 2 Floo...
House Sukhumvit 71 For Sale
Soi Pridi Banomyong 15, Khwaeng Phra Khanong Nuea, Khet Watthana, Krung Thep Maha Nakhon 10110 For Sale ฿23,000,000
Property type: Single House 4 4 450 Sqm 0-0-97 Rai-Ngan-Sq.w District: Watthana Province/City: Bangkok BTS Phra Khanong

For Sale
Single House For Sale on Krung Thep Kritha Rd
Property Code MGP875
5 Bedrooms 6 Bathrooms, Living Area 400 Sqm
2 Floors, Land Size 223 Sq.wah,...
House For Sale on Krung Thep Kritha Rd
165 Krung Thep Kritha Rd, Khwaeng Saphan Sung, Khet Saphan Sung, Krung Thep Maha Nakhon 10240, Thailand For Sale ฿25,000,000
Property type: Single House 5 6 400 Sqm 0-2-23 Rai-Ngan-Sq.w District: Saphan Sung Province/City: Bangkok

For Sale
3 Bedrooms Single House in Grand Canal Prachachuen for sale in Bang Talat, Pak Kret, Nonthaburi 3 Bedrooms Single House For Sale
Property Code MG...
Grand Canal Prachachuen House
Soi Mu Ban Grand Canal, Bang Talat, Pak Kret District, Nonthaburi, Thailand For Sale ฿19,800,000
Property type: Single House 3 3 300 Sqm 0-1-15 Rai-Ngan-Sq.w District: Pak Kret Province/City: Nonthaburi

For Sale
4 Bedrooms Single House For Sale in Soi Phahon Yothin 8
Property Code MGP864
4 Bedrooms 5 Bathrooms, Living Area 450 Sqm
3 Floors, Land Size 6...
House in Soi Phahon Yothin 8
Phahon Yothin 8 Alley, Samsen Nai, Phaya Thai, Bangkok 10400, Thailand For Sale ฿42,000,000
Property type: Single House 4 5 450 Sqm 0-0-67 Rai-Ngan-Sq.w District: Phaya Thai Province/City: Bangkok BTS Ari

For Sale
Prukpirom Regent Sukhumvit
5 Bedrooms House For Sale
Property Code MGP841
5 Bedrooms 7 Bathrooms, Living Area 720 Sqm
2 Floors, Land Size 2...
Prukpirom Regent Sukhumvit
Prukpirom Regent Sukhumvit, Bang Na, Bangkok, Thailand For Sale ฿69,000,000
Property type: Single House 5 6+ 720 Sqm 0-2-71 Rai-Ngan-Sq.w District: Bang Na Province/City: Bangkok

For Sale
Baan Sansiri Sukhumvit 67 Single House For Sale
Property Code MGP812
5 Bedrooms 6 Bathrooms, Living Area 560 Sqm
Land Size 158 Sq.wah, 2 Floor...
Baan Sansiri Sukhumvit 67
Baan Sansiri Sukhumvit 67 Soi Sukhumvit 67, Phra Khanong Nuea, Watthana, Bangkok, Thailand For Sale ฿189,000,000
Property type: Single House 5 6 560 Sqm 0-1-58 Rai-Ngan-Sq.w District: Watthana Province/City: Bangkok BTS Phra Khanong