The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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proton rms charge radius
 $r_{\rm p}$
 Value  0.8751 x 10-15 m
 Standard uncertainty  0.0061 x 10-15 m
  Relative standard uncertainty   7.0 x 10-3
 Concise form  0.8751(61) x 10-15 m    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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