The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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proton-neutron mass ratio
 $m_{\rm p}/m_{\rm n}$
 Value  0.998 623 478 44
 Standard uncertainty  0.000 000 000 51
  Relative standard uncertainty   5.1 x 10-10
 Concise form  0.998 623 478 44(51)    
 
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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