The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic unit of time
 $\hbar/E_{\rm h}$
 Numerical value  2.418 884 326 5857 x 10-17 s
 Standard uncertainty  0.000 000 000 0047 x 10-17 s
  Relative standard uncertainty  1.9 x 10-12
 Concise form  2.418 884 326 5857(47) x 10-17 s    
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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