The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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electron mass in u
 $ m_{\rm e}/{\rm u} = m_{\rm e}/m_{\rm u} = N_{\rm A} m_{\rm e}/(10^{-3}\,{\rm kg\,mol}^{-1})$
 Numerical value  5.485 799 090 65 x 10-4 u
 Standard uncertainty  0.000 000 000 16 x 10-4 u
  Relative standard uncertainty  2.9 x 10-11
 Concise form  5.485 799 090 65(16) x 10-4 u    
 
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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