The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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hertz-atomic mass unit relationship
$(1 \ {\rm Hz})h/c^2$
 Value  4.439 821 6294 x 10-24 u
 Standard uncertainty  0.000 000 0064 x 10-24 u
  Relative standard uncertainty   1.4 x 10-9
 Concise form  4.439 821 6294(64) x 10-24 u    
 
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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