The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Planck constant over 2 pi in eV s
 $\hbar$
 Value  6.582 119 514 x 10-16 eV s
 Standard uncertainty  0.000 000 040 x 10-16 eV s
  Relative standard uncertainty   6.1 x 10-9
 Concise form  6.582 119 514(40) x 10-16 eV s    
 
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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