The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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hertz-kilogram relationship
$(1 \ {\rm Hz})h/c^2$
 Value  7.372 496 00 x 10-51 kg
 Standard uncertainty  0.000 000 37 x 10-51 kg
  Relative standard uncertainty   5.0 x 10-8
 Concise form  7.372 496 00(37) x 10-51 kg    
 
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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