The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Newtonian constant of gravitation over h-bar c
 $ G/\hbar c $
 Value  6.708 61 x 10-39 (GeV/c2)-2
 Standard uncertainty  0.000 31 x 10-39 (GeV/c2)-2
  Relative standard uncertainty   4.7 x 10-5
 Concise form  6.708 61(31) x 10-39 (GeV/c2)-2    
 
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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