The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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kilogram-atomic mass unit relationship
$1 \ {\rm kg}$
 Value  6.022 141 29 x 1026 u
 Standard uncertainty  0.000 000 27 x 1026 u
  Relative standard uncertainty   4.4 x 10-8
 Concise form  6.022 141 29(27) x 1026 u    
 
Click here for correlation coefficient of this constant with other constants
Source: 2010 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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