The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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natural unit of momentum in MeV/c
 $m_{\rm e}c$
 Value  0.510 998 9461 MeV/c
 Standard uncertainty  0.000 000 0031 MeV/c
  Relative standard uncertainty   6.2 x 10-9
 Concise form  0.510 998 9461(31) MeV/c    
 
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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