The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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proton-electron mass ratio
 $m_{\rm p}/m_{\rm e}$
 Value  1836.152 673 89
 Standard uncertainty     0.000 000 17
  Relative standard uncertainty   9.5 x 10-11
 Concise form  1836.152 673 89(17)    
 
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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