The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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hertz-kilogram relationship
 $(1 \ {\rm Hz})h/c^2$
 Value  7.372 497 201 x 10-51 kg
 Standard uncertainty  0.000 000 091 x 10-51 kg
  Relative standard uncertainty   1.2 x 10-8
 Concise form  7.372 497 201(91) x 10-51 kg    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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