The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Click symbol for equation
inverse fine-structure constant
 $\alpha^{-1}$
 Numerical value  137.035 999 084
 Standard uncertainty    0.000 000 021
  Relative standard uncertainty  1.5 x 10-10
 Concise form  137.035 999 084(21)    
 
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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