The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants,
Units &
Uncertainty
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Planck mass
 $m_{\rm P}$
 Numerical value  2.176 434 x 10-8 kg
 Standard uncertainty  0.000 024 x 10-8 kg
  Relative standard uncertainty  1.1 x 10-5
 Concise form  2.176 434(24) x 10-8 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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