The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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hertz-kilogram relationship
 $(1 \ {\rm Hz})h/c^2$
 Numerical value  7.372 497 323...  x 10-51 kg
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  7.372 497 323... x 10-51 kg    
 
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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