萬國公制，簡稱公制，或稱國際單位制，乃諸國共用之度量衡也，取十進制以計。法人製之。初，歐陸諸國度量未一，格致、商賈，多有不便。法國革命，立爲新制，後漸爲諸國所取。
昔英法世仇，英治諸地多不行此法，至二十世紀下半葉，乃從之。遍觀當世諸國則於官惟美國、緬甸、賴比瑞亞未行耳。於民，諸地風俗各異，輒未一之，英人多行英制，華人多行市制是也，惟以官定算率可乘而換之也。
萬國公制基礎單位有七，曰秒、曰米、曰千克、曰安培、曰摩爾、曰開爾文、曰坎德拉。其餘單位，皆由此出。
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