The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Planck length
$l_{\rm P}$
 Value  1.616 199 x 10-35 m
 Standard uncertainty  0.000 097 x 10-35 m
  Relative standard uncertainty   6.0 x 10-5
 Concise form  1.616 199(97) x 10-35 m    
 
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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