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jiǎo [Chinese]

China, a unit of area, before 20ᵗʰ century reforms, about 153.6 square meters (about 183.7 square yards), = ¼ mu. That value comes from taking the chi at 32 centimeters (which is the building and surveying chi of the Qing dynasty) and the mu at 6000 square chi, thus = 614.4 square meters.

In dialect, same as hào 毫

Oxford Chinese Dictionary 2010 = measure word, quarter

sources

Chinese Land Measure

5 chih 尺 make one 步 pú (pace), or 弓 kung (bow).

24 pú 步 make one 分 fan;

60 pú 步 make one 角 kioh, or horn;

4 kioh 角 or 240 pú, make one 畝 mau, or Chinese acre;

100 mau 畝 make one 頃 k'ing.

S. Wells Williams.
A Chinese Commercial Guide, consisting of a collection of details and regulations respecting foreign trade with China…
Canton: at the Office of the Chinese Repository, 1856.
Page 391.

Converting to pinyin romanization, chih is chǐ, pú is bù, kung is gōng, fan is fēn, mao is mǔ, k'ing is qing.

Mesures de surface. — L'unité est le méou. Le méou est un rectangle de 240 pou de long sur pou de large. 5 tchi sont 1 pou (pas) ou 1 koung (arc); 1 pou carré est de 25 tchi carrés. 24 pou carrés sont 1 fen, 2 fen ½ ou 60 pou sont 1 kioh, 4 kioh sont 1 méou, et 100 méou sont 1 king.

Dans la pratique, on ne fait pas usage de ces divisions du méou; on estime les surfaces agraires par king et méou, et l'on indique les fractions de méou par les décimales ordinaires, fen, li, hao, sse, etc.

Measures of area. The unit is the mǔ. The mǔ is a rectangle 240 bù long and 1 bù wide. 5 chǐ are 1 bù (pace) or 1 gōng; 1 square bù consists of 25 square chǐ. 24 square bù are 1 fēn, 2½ fēn or 60 bù are 1 kioh, 4 kioh are 1 mǔ, and 100 mǔ are 1 qing.

In practice, one doesn't use the subdivisions of the mǔ. One estimates the size of rural land in qing or mǔ; and one indicates fractions of a mǔ by the usual decimal terms, fen, li, hao, sse, etc.

Dictionnaire Universal Theorique et Pratique du Commerce et de la Navigation, vol 2.
Paris: Librairie de Guillaumin et Cie, 1861.
Page 1052.