Yin (length)

The Yin in Mandarin, or jan in Cantonese, is a traditional Chinese unit of length. One yin equals 1/15 of a li, 10 zhang, or 33+1⁄3 m in China.

Chinese length units promulgated in 1915

Pinyin	Character	Relative value	Metric value	Imperial value	Notes
háo	毫		32 μm
lí	釐 or 厘		0.32 mm	0.0126 in
fēn	分		3.2 mm	0.126 in
cùn	寸		32 mm	1.26 in	Chinese inch
chǐ	尺	1	0.32 m	12.6 in	Chinese foot
bù	步	5	1.6 m	5.2 ft	Chinese pace
zhàng	丈	10	3.2 m	3.50 yd	Chinese yard
yǐn	引	100	32 m	35.0 yd
lǐ	里	1800	576 m	630 yd	Chinese mile, this li is not the small li above, which has a different character and tone

This law of length measurement was issued by the Chinese government in 1929, and has been effective since 1 January, 1930. The base unit chi is defined to be 1/3 meter.

Pinyin	Character	Relative value	Metric value	Imperial value	Notes
háo	毫		μm		Chinese mil
lí	釐 or 厘		mm	0.0131 in	Chinese calibre
fēn	市分		mm	0.1312 in	Chinese line
cùn	市寸		cm	1.312 in	Chinese inch
chǐ	市尺	1	cm	13.12 in	Chinese foot
zhàng	市丈	10	m	3.645 yd	Chinese yard
yǐn	引	100	m	36.45 yd	Chinese chain
lǐ	市里	1500	500 m	546.8 yd	Chinese mile, this li is not the small li above, which has a different character and tone

These units are based on the metric system. The Chinese word for metre is 米 mǐ, which can take the Chinese standard SI prefixes.
In the engineering field, traditional units are rounded up to metric units.

Pinyin	Character	Relative value	Metric value	Imperial value	Notes
hū	忽		1 μm		Authorized name: 微米
sī	絲 or 丝		10 μm		Authorized name: 忽米
háo	毫		100 μm		Authorized name: 絲米 or 丝米
lí	釐 or 厘		1 mm		Authorized name: 毫米
fēn	公分		10 mm		Authorized name: 釐米 or 厘米
cùn	公寸		100 mm		Authorized name: 分米
chǐ	公尺	1	1 m		Authorized name: 米
Zhàng	公丈	10	10 m		Authorized name: 十米
yǐn	公引	100	100 m		Authorized name: 百米
lǐ	公里	1000	1000 m		this li is not the small li above, which has a different character and tone