The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Planck constant over 2 pi
 $\hbar$
 Value  1.054 571 726 x 10-34 J s
 Standard uncertainty  0.000 000 047 x 10-34 J s
  Relative standard uncertainty   4.4 x 10-8
 Concise form  1.054 571 726(47) x 10-34 J s    
 
Click here for correlation coefficient of this constant with other constants
Source: 2010 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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