The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Correlation coefficient between two constants
electron mass energy equivalent
 $m_{\rm e}c^2$
 Numerical value  8.187 105 7769 x 10-14 J
 Standard uncertainty  0.000 000 0025 x 10-14 J
  Relative standard uncertainty  3.0 x 10-10
 Concise form  8.187 105 7769(25) x 10-14 J    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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