The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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neutron mass energy equivalent
 $m_{\rm n}c^2$
 Value  1.505 349 631 x 10-10 J
 Standard uncertainty  0.000 000 066 x 10-10 J
  Relative standard uncertainty   4.4 x 10-8
 Concise form  1.505 349 631(66) x 10-10 J    
 
Click here for correlation coefficient of this constant with other constants
Source: 2010 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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