The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
inverse meter-joule relationship†
 $(1 \ {\rm m}^{-1})hc$
 Numerical value  1.986 445 857...  x 10-25 J
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  1.986 445 857... x 10-25 J    
†The full description of unit m-1 is cycles or periods per meter.
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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