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Note: Fractional results are rounded to the nearest 1/64. For a more accurate answer please select 'decimal' from the options above the result.
Note: You can increase or decrease the accuracy of this answer by selecting the number of significant figures required from the options above the result.
Note: For a pure decimal result please select 'decimal' from the options above the result.
The kg is defined as being equal to the mass of the International Prototype of the Kilogram (IPK), a block of platinum-iridium alloy manufactured in 1889 and stored at the International Bureau of Weights and Measures in Sèvres, France.
It is the only SI unit that is defined by a physical object rather than a fundamental physical property that can be reproduced in laboratories.
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A unit of mass equal to one-millionth of a gram.
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Created:Fri 31 Oct 2003 this page last updated:: Wed 08 Feb 2013