The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic mass constant
 $ m_{\rm u} = {1\over{12}} m(^{12}{\rm C}) $
 Numerical value  1.660 539 068 92 x 10-27 kg
 Standard uncertainty  0.000 000 000 52 x 10-27 kg
  Relative standard uncertainty  3.1 x 10-10
 Concise form  1.660 539 068 92(52) x 10-27 kg    
 
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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