The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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classical electron radius
 $r_{\rm e}$
 Value  2.817 940 3267 x 10-15 m
 Standard uncertainty  0.000 000 0027 x 10-15 m
  Relative standard uncertainty   9.7 x 10-10
 Concise form  2.817 940 3267(27) x 10-15 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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