The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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proton mass energy equivalent
$m_{\rm p}c^2$
 Value  1.503 277 593 x 10-10 J
 Standard uncertainty  0.000 000 018 x 10-10 J
  Relative standard uncertainty   1.2 x 10-8
 Concise form  1.503 277 593(18) x 10-10 J    
 
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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