The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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neutron-proton mass difference
 $m_{\rm n}-m_{\rm p}$
 Numerical value  2.305 574 35 x 10-30 kg
 Standard uncertainty  0.000 000 82 x 10-30 kg
  Relative standard uncertainty  3.5 x 10-7
 Concise form  2.305 574 35(82) x 10-30 kg    
 
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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