The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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inverse meter-atomic mass unit relationship
 $(1 \ {\rm m}^{-1})h/c$
 Value  1.331 025 049 00 x 10-15 u
 Standard uncertainty  0.000 000 000 61 x 10-15 u
  Relative standard uncertainty   4.5 x 10-10
 Concise form  1.331 025 049 00(61) x 10-15 u    
 
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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