The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic mass unit-hertz relationship
$(1 \ {\rm u})c^2/h$
 Value  2.252 342 7369 x 1023 Hz
 Standard uncertainty  0.000 000 0032 x 1023 Hz
  Relative standard uncertainty   1.4 x 10-9
 Concise form  2.252 342 7369(32) x 1023 Hz    
 
Click here for correlation coefficient of this constant with other constants
Source: 2006 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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