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)/({\rm MeV}/c) = 10^{-6} (m_{\rm e}c^2/{\rm J})/(e/{\rm C}) $
 Numerical value  0.510 998 950 00 MeV/c
 Standard uncertainty  0.000 000 000 15 MeV/c
  Relative standard uncertainty  3.0 x 10-10
 Concise form  0.510 998 950 00(15) MeV/c    
 
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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