The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic mass unit-hertz relationship
 $ (1\,{\rm u})\,c^2/h = [m_{\rm u}\,c^2/({\rm Hz} \, h)]\, {\rm Hz} $
 Numerical value  2.252 342 721 85 x 1023 Hz
 Standard uncertainty  0.000 000 000 70 x 1023 Hz
  Relative standard uncertainty  3.1 x 10-10
 Concise form  2.252 342 721 85(70) x 1023 Hz    
 
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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