Master Sun’s Mathematical Classic: Volume One

Compiled and Annotated by Imperial Decree by Li Chunfeng and others, holding the titles of Grand Master for Closing Court, Acting Director of the Imperial Bureau of Astronomy, and Commandant of Light Chariots of the Tang Dynasty. Li Chunfeng (602–670 AD) was the preeminent mathematician and astronomer of the Tang court, famous for his commentaries on the "Ten Computational Canons."

The measurement of length begins with the hu|original: 忽; a minute unit representing the limit of perception. If you wish to know the scale of a hu, consider that the silk produced by a silkworm constitutes one hu.

Ten hu make one si|original: 絲; a silk strand.
Ten si make one hao|original: 毫; a fine hair.
Ten hao make one li|original: 釐.
Ten li make one fen|original: 分; a 'point' or tenth of an inch.
Ten fen make one cun|original: 寸; the Chinese inch.
Ten cun make one chi|original: 尺; the Chinese foot.
Ten chi make one zhang|original: 丈.
Ten zhang make one yin|original: 引.
Fifty chi make one duan|original: 端; a measure typically used for lengths of cloth.
Forty chi make one pi|original: 疋; a standard 'bolt' of fabric.
Six chi make one bu|original: 步; a double-pace.
Two hundred and forty bu make one mu|original: 畝; the standard unit of land area.
Three hundred bu make one li|original: 里; the Chinese mile.

The measurement of weight begins with a grain of millet|original: 黍 (shu); specifically black broomcorn millet, used as a physical standard for weight and volume.

Ten grains of millet make one lei|original: 絫.
Ten lei make one zhu|original: 銖.
Twenty-four zhu make one liang|original: 兩; the Chinese ounce or tael.
Sixteen liang make one jin|original: 斤; the Chinese pound or catty.
Thirty jin make one jun|original: 鈞.