The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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classical electron radius
 $r_{\rm e}$
 Numerical value  2.817 940 3262 x 10-15 m
 Standard uncertainty  0.000 000 0013 x 10-15 m
  Relative standard uncertainty  4.5 x 10-10
 Concise form  2.817 940 3262(13) x 10-15 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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