The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron g factor
 $ g_{\rm e} = -2(1+a_{\rm e}) = 2\mu_{\rm e}/\mu_{\rm B} = 2\mu_{\rm e}/(e\hbar/2m_{\rm e})$
 Numerical value  -2.002 319 304 362 56
 Standard uncertainty   0.000 000 000 000 35
  Relative standard uncertainty  1.7 x 10-13
 Concise form  -2.002 319 304 362 56(35)    
 
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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