亩是中国市制丈量土地面积的面积单位，俗话说一亩三分地，那么亩有多少平方米呢？官方算法为：1亩=666.6666667平方米(㎡)
一亩等于六十平方丈，大约666.67平方米。十五亩等于一公顷。
通过常用的单位换算方式来计算。面积单位最常用的就是平方米，通过国际常用单位即公倾：1公倾＝10000平方米。约等于一个标准足球场的面积。一个公顷等于15亩，那么1亩＝10000÷15≈6.6666667平方米。
“亩”字来源于中国夏、商、周的井田制度。在先秦一些重要文献中，“亩”往往是对“私田”的称呼；“田”往往是对“公田”的称呼。到了清朝时，皇帝“了解”了农时，“熟悉”节令之后，开始重视农业生产，为此在中南海划出了一块土地，每年在这里“演试亲耕”，这块地恰好一亩三分，这块地将作为帝王家世代沿袭，他人不得改用，后面给农民划分生产的也是按照亩来计量。所以一亩三分地也表示个人利益或个人势力范围。
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