The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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kilogram-hartree relationship
 $ (1\,{\rm kg})c^2 = [{\rm kg}\,c^2/(2\,hc\,R_\infty)] \, E_{\rm h} $
 Numerical value  2.061 485 788 7409 x 1034 Eh
 Standard uncertainty  0.000 000 000 0040 x 1034 Eh
  Relative standard uncertainty  1.9 x 10-12
 Concise form  2.061 485 788 7409(40) x 1034 Eh    
 
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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