The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic mass unit-hertz relationship
 $(1 \ {\rm u})c^2/h$
 Value  2.252 342 7206 x 1023 Hz
 Standard uncertainty  0.000 000 0010 x 1023 Hz
  Relative standard uncertainty   4.5 x 10-10
 Concise form  2.252 342 7206(10) x 1023 Hz    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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