The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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kilogram-atomic mass unit relationship
 $1 \ {\rm kg}$
 Numerical value  6.022 140 7621 x 1026 u
 Standard uncertainty  0.000 000 0018 x 1026 u
  Relative standard uncertainty  3.0 x 10-10
 Concise form  6.022 140 7621(18) x 1026 u    
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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