The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
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Uncertainty
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Click symbol for equation
kelvin-kilogram relationship
 $(1 \ {\rm K})k/c^2$
 Numerical value  1.536 179 187...  x 10-40 kg
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  1.536 179 187... x 10-40 kg    
 
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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