| Description | SI multiples of gram Multiple Name Symbol Multiple Name Symbol 10 0 gram g 10 1 decagram dag 10 –1 decigram dg 10 2 hectogram hg 10 –2 centigram cg 10 3 kilogram kg 10 –3 milligram mg 10 6 megagram Mg 10 –6 microgram µg 10 9 gigagram Gg 10 –9 nanogram ng 10 12 teragram Tg 10 –12 picogram pg 10 15 petagram Pg 10 –15 femtogram fg 10 18 exagram Eg 10 –18 attogram ag 10 21 zettagram Zg 10 –21 zeptogram zg 10 24 yottagram Yg 10 –24 yoctogram yg This international prototype, made of platinum-iridium, is kept at the BIPM under conditions specified by the 1st CGPM in 1889. Photograph courtesy of © BIPM The kilogram is the unit of mass in the International System of Units (SI) . |
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