The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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molar mass of carbon-12
 $ M(^{12}{\rm C}) = N_{\rm A} m(^{12}{\rm C}) $
 Numerical value  12.000 000 0126 x 10-3 kg mol-1
 Standard uncertainty   0.000 000 0037 x 10-3 kg mol-1
  Relative standard uncertainty  3.1 x 10-10
 Concise form  12.000 000 0126(37) x 10-3 kg mol-1    
 
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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