Dan (), or Daam in Cantonese, Tan in Japanese and Taiwanese, also called "Chinese hundredweight" or "picul", is a traditional Chinese unit for weight measurement in East Asia. It originated in China before being introduced to neighboring countries. Nowaday, the mass of 1 dan equals 100 jin or 50 kg in mainland China, 60 kg in Taiwan and Japan, and 60.478982 kg in Hong Kong, Singapore and Malaysia. Dan is mostly used in the traditional markets.
On June 25, 1959, the State Council of the People's Republic of China issued the Order on the Unified Measurement System, with minor amendment to the market system. "
Legally, 1 dan equals 100 jins, 50 kg, or 110.2 lb.
The so-called Taiwan dan is actually the dan used throughout China during the Qing Dynasty. 1 Taiwan dan is 60 kg, equal to 100 Taiwan jin.
Hong Kong law stipulates that one dan is equal to one hundred jin , which is 60.478982 kg.
Singapore and Malaysia have similar regulations as Hong Kong, as they are all former British colonies.
In Japan, 1 dan, or tan in Japanese pronunciation, is equal to 60 kg.