The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic mass unit-electron volt relationship
 $(1 \ {\rm u})c^2$
 Numerical value  9.314 941 0242 x 108 eV
 Standard uncertainty  0.000 000 0028 x 108 eV
  Relative standard uncertainty  3.0 x 10-10
 Concise form  9.314 941 0242(28) x 108 eV    
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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