The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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proton-electron mass ratio
 $m_{\rm p}/m_{\rm e}$
 Numerical value  1836.152 673 426
 Standard uncertainty     0.000 000 032
  Relative standard uncertainty  1.7 x 10-11
 Concise form  1836.152 673 426(32)    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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