The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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Correlation coefficient between two constants
neutron mass energy equivalent in MeV
 $m_{\rm n}c^2$
 Numerical value  939.565 420 52 MeV
 Standard uncertainty    0.000 000 54 MeV
  Relative standard uncertainty  5.7 x 10-10
 Concise form  939.565 420 52(54) MeV    
 
Source: 2018 CODATA     
recommended values 		 Definition of
uncertainty 		       Correlation coefficient with
any other constant

 
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