According to the current weights and measures, one kilogram is twelve taels, which is 500 grams.

Half a catty means equal to each other and equal in strength. Because in ancient times, a catty was sixteen taels, and in ancient times, half a catty was eight taels.

Extended data:

Idiom explanation:

Eight Liang: That's half a catty. One and a half Jin, one and a half Liang. Metaphor is equal to each other and equal in strength.

Idiom origin:

1, Songshi Puji's "Five Lights Meeting Yuan" Volume 11: "Q:' Come, nothing goes, two-way loss. How can you not get lost? "The teacher said,' The head of the scale is half a catty, and the tail is eight taels.' "

2. Songshi Baiwei's "Continued Lights in Jianzhong Guo Jing": "The scale is as hard as iron, and eight or two is actually half a catty."

References:

Half a catty and eight Liang Baidu encyclopedia