The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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hertz-atomic mass unit relationship
 $ (1\,{\rm Hz})\,h/c^2 = [{\rm Hz}\,h/(m_{\rm u} \, c^2)]\, {\rm kg} $
 Numerical value  4.439 821 6590 x 10-24 u
 Standard uncertainty  0.000 000 0014 x 10-24 u
  Relative standard uncertainty  3.1 x 10-10
 Concise form  4.439 821 6590(14) x 10-24 u    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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