The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron mass in u
$m_{\rm e}$
 Value  5.485 799 0946 x 10-4 u
 Standard uncertainty  0.000 000 0022 x 10-4 u
  Relative standard uncertainty   4.0 x 10-10
 Concise form  5.485 799 0946(22) x 10-4 u    
 
Click here for correlation coefficient of this constant with other constants
Source: 2010 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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