The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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deuteron mass in u
 $ m_{\rm d}/{\rm u} = m_{\rm d}/m_{\rm u} $
 Numerical value  2.013 553 212 745 u
 Standard uncertainty  0.000 000 000 040 u
  Relative standard uncertainty  2.0 x 10-11
 Concise form  2.013 553 212 745(40) 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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