The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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kilogram-electron volt relationship
 $(1 \ {\rm kg})c^2$
 Value  5.609 588 650 x 1035 eV
 Standard uncertainty  0.000 000 034 x 1035 eV
  Relative standard uncertainty   6.1 x 10-9
 Concise form  5.609 588 650(34) x 1035 eV    
 
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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