The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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hartree-atomic mass unit relationship
 $(1 \ E_{\rm h})/c^2$
 Numerical value  2.921 262 322 05 x 10-8 u
 Standard uncertainty  0.000 000 000 88 x 10-8 u
  Relative standard uncertainty  3.0 x 10-10
 Concise form  2.921 262 322 05(88) x 10-8 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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