The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron mass energy equivalent in MeV
 $m_{\rm e}c^2$
 Numerical value  0.510 998 950 00 MeV
 Standard uncertainty  0.000 000 000 15 MeV
  Relative standard uncertainty  3.0 x 10-10
 Concise form  0.510 998 950 00(15) MeV    
 
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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