The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
joule-hartree relationship
 1 J
 Numerical value  2.293 712 278 3963 x 1017 Eh
 Standard uncertainty  0.000 000 000 0045 x 1017 Eh
  Relative standard uncertainty  1.9 x 10-12
 Concise form  2.293 712 278 3963(45) x 1017 Eh    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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