See also coyan and koyan.

In the Dutch East Indies, and then Indonesia, ? – 20ᵗʰ century, units of volume and mass. The Dutch spelling is kojang.


As a unit of dry capacity, the koyang was used for salt, and = 30 piculs = 240 gantangs, about 2011.316 liters. Other sources2,3 say 2011.2679 liters.


As a unit of mass used for rice, the kojang's value varied locally.

Location Value in
Value in
Jakarta (former Batavia) 27 piculs 1667.555 kg
Semarang 28 piculs 1729.316 kg
Surabaya 30 piculs 1852.839 kg

In measuring freight being loaded on ships, the kojang = 32 piculs = 2 tons (each of 988.181 kg), about 1976.362 kilograms. The use in loading has led some writers to misinterpret this kojang as a unit of volume.

1. These values are given in United Nations 1966 and also in
The Netherlands Indies.
Buitenzorg, Java: Div. of Commerce, Dept. of Agriculture, Industry and Commerce, no date (not later than 1928).

Page 45. Nineteenth century sources (e.g., Waverly) give the same ratio but take the picul as 61.521 kg.

2. Charles-èdouard Guillame and Charles Volet.
National and local systems of weights and measures.
National Research Council of the United States of America.
International Critical Tables of Numerical Data, Physics, Chemistry and Technology.
McGraw-Hill Book Company, 1926.

Page 5.

3. Encyclopaedie van Nederlandsch-Indië. 2nd edition.
Simon de Graaff and D. G. Stibbe, editors.
's-Gravenhage: Martinus Nijhoff, 1918.

Volume 2. Page 688.

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