How many grams was one or two in ancient times?

The ancient prescription of one or two is now 3 1.25 grams.

In ancient times, a kilo was 16 Liang, because a kilo was 500 grams, so one or two was 3 1.25 grams.

Liu Xiang in the Han Dynasty recorded in Shuo Wu: "Sixteen millet is one bean, six beans are one baht, twenty-four baht weighs one or two, and sixteen ounces is one catty." It means sixteen millet equals one bean, six beans equals one baht, twenty-four baht equals one tael, and sixteen taels equals one catty.

From the beginning of the concept of "gold" to the end of the Republic of China, the "gold" in past dynasties was 16, not today's 10. With the weight of "Jin", it is easy to calculate the weight of "two" and divide it by 16.

Extended data:

According to Hanshu, the system of weights and measures in Qin and Han Dynasties was: the system of weights and measures: baht, beam, gold, jun and stone. 1 stone =4 jun, 1 jun =30 Jin, 1 Jin = 16 Liang, 1 Liang =24 baht.

In the Western Han Dynasty, one kilogram was equivalent to 258.24 grams, and one or two kilograms was equivalent to 16. 14 grams.

Wang Mang and the Eastern Han, Wei, Jin, Southern and Northern Dynasties, one Jin is equivalent to 222.73 grams, and one or two is equal to 13.92 grams.

In the early years of the Sui Dynasty, one kilogram was equivalent to 668. 19 grams, and one or two kilograms was equivalent to 4 1.76 grams.

At the end of Sui Dynasty, one kilogram was equivalent to 222.73 grams, and one or two kilograms was equivalent to 13.92 grams.

From the Tang Dynasty to the Qing Dynasty, one catty was equivalent to 596.82 grams, and one or two was equivalent to 37.30 grams.

Note: The weight of medical beams in Han Dynasty is different from that of beams commonly used in Han Dynasty. Han inherited the Qin system, and the medical beam continued to use the Qin system. Therefore, two of Zhang Zhongjing's medical works in Han Dynasty are Qin Liang, which is equivalent to 3 grams.