The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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proton rms charge radius
 $r_{\rm p}$
 Numerical value  8.4075 x 10-16 m
 Standard uncertainty  0.0064 x 10-16 m
  Relative standard uncertainty  7.6 x 10-4
 Concise form  8.4075(64) x 10-16 m    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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