What it is
Chinese market cun (shi-cun) is 1 cun = 1/30 m ~ 3.333 cm ~ 1.312 in. It is not the Japanese wasai sun (1/33 m).
How to use
inches x 0.762 = cun (1 in = 2.54 cm, 1 cun = 3.333 cm, so 2.54/3.333 ~ 0.762). Reverse: cun x 1.312 = inches. The converter above uses this factor.
寸 = in × 0.762
Example: 1 in = 0.762 寸
Common uses
Chinese body measuring, qipao fitting, and comparing Chinese sewing patterns with inch-based patterns.
Conversion tips
About 1 cun ~ 1.3 inches. Write shi-cun (Chinese cun) so it is not confused with the Japanese sun.