The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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electron mass in u
 $m_{\rm e}$
 Numerical value  5.485 799 090 441 x 10-4 u
 Standard uncertainty  0.000 000 000 097 x 10-4 u
  Relative standard uncertainty  1.8 x 10-11
 Concise form  5.485 799 090 441(97) x 10-4 u    
 
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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