Thailand
premetric units of mass

Early European commentators confused the chang with the Chinese catty, which is half its size. Other Thai units confused with the more familiar Chinese trade units were the tamlung, confounded with the tael, and the baht with the tical. Kelly (1835), for example (page 117), describes a pecul of 50 catties, and a catty of 20 tales or 80 ticals.

p'ahrah

hap or picul

100

chang

50

[Chinese catty] & Thai standard catty

2

100

tamlung or tael

10

20

1000

baht or tical

4

40

80

4000

salung

4

16

160

320

16,000

fuang

2

8

32

320

640

32,000

seek

2

4

16

64

640

1280

64,000

pai

2

4

8

32

128

1280

2560

128,000

att or klam

2

4

8

16

64

256

2560

5120

256,000

solot or klom

2

4

8

16

32

128

512

5120

10,240

512,000

mid-20th century¹ 

117
mg

234.3
mg

468.7
mg

1.875
g

3.75
g

15
g

60
g

600
g

1.2
kg

60
kg

late 19th century²

118.1
mg

236.2
mg

472.5
mg

1.890
g

3.78
g

15.12
g

60.48
g

604.8
g

1.2
kg

60.5
kg

Not included in the chart is the hun, = 1/5 of a fuang.

In the export trade (see Nelkenbrecher (1890), page 65), the chang was taken as = 2 Chinese catties, = 2 2/3 pounds avoirdupois = 1.20958 kilograms.

Statistical Office of the United Nations in collaboration with the Food and Agriculture Organization of the United Nations.
World Weights and Measures. Handbook for Statisticians. Provisional Edition.
Statistical Papers: Series M, No. 21.
New York: United Nations, 1955.

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