The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Planck length
 $ l_{\rm P} = \hbar/m_{\rm P} c = (\hbar G/c^3)^{1/2}$
 Numerical value  1.616 255 x 10-35 m
 Standard uncertainty  0.000 018 x 10-35 m
  Relative standard uncertainty  1.1 x 10-5
 Concise form  1.616 255(18) x 10-35 m    
 
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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