In Taiwan the measurement units were pronounced in Taiwanese Hokkien and Hakka before World War II and adopted by the Mandarin-speaking immigrants from China in 1949.
The principal unit for measuring the floor space of an office or apartment is 坪 (Taiwanese Hokkien: pêⁿ,[1] Hakka: phiàng, Mandarin: píng).
The principal unit of land measure is 甲 (Taiwanese Hokkien: kah, Hakka: kap, Mandarin: jiǎ).
In the later era Kingdom of Tungning, 犁 (Taiwanese Hokkien: lê, Hakka: lài, Mandarin: lí) is defined to represent the area that could be farmed by one man with one ox and one plow in one day.
Today, the rule for converting the two major units from two different sources is 1 甲 (Taiwanese Hokkien: kah, Hakka: kap, Mandarin: jiǎ, Dutch morgen) = 2,934 坪 (Taiwanese Hokkien: pêⁿ, Hakka: phiàng, Mandarin: píng, Japanese tsubo)Officially, land area is measured in square metres.