The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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electron mass energy equivalent in MeV
 $ m_{\rm e}c^2/{\rm MeV} = 10^{-6}(m_{\rm e}c^2/{\rm J})/(e/{\rm C}) $
 Numerical value  0.510 998 950 69 MeV
 Standard uncertainty  0.000 000 000 16 MeV
  Relative standard uncertainty  3.1 x 10-10
 Concise form  0.510 998 950 69(16) MeV    
 
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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