coyan or koyan

A unit of mass in Southeast Asia.

In Sarawak, 3,098 pounds.

1

In Thailand, since 1923 a unit of mass, the standard koyan = 1200 kilograms. a unit of capacity = 80 thangsat

2 645.54715 lb.

Earlier values:

The Bangkok coyan, used for rice and salt, 16.6305 koku

The coyan, which is in reality a measure of capacity, is often used to designate a multiple of the hap. It is generally equal to 20 hap, although it ranges from 18 to 22 hap. The coyan of paddy is reckoned at about 16.6 hap and considered equal to 2133 1/3 lbs.¹

The last sentence requires a hap of 128 pounds avoirdupois. The legal weight of the hap was 133.75 pounds avoirdupois, making the

18=2407.5=

20=2675=


premetric coyan	20 piculs	approximately 1,213.36 kilograms
coyan for rice	22 piculs	approximately 1,334.7 kilograms
coyan for salt	25 piculs	about 1,516.7 kilograms

1. Blockhuys, 1924. page 61.

2

In Burma, 19th century, a unit of capacity = 100 tengs = 100 imperial bushels, about 3.637 cubic meters.

3

In Malaysia, the koyan, a unit of capacity = 40 pikuls or about 800 gantangs. The spelling is that of the 1972 spelling reform.

4

In the Netherlands East Indies, 19^th – early 20^th centuries, a measure of capacity for rice, grain and salt, varying by locality (ostensibly, it represents a weight of 30 picols).


Batavia coyan	27 picols
Samarang coyan	28 picols
Soerabaya coyan	30 picols