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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Planck mass energy equivalent in GeV
 $m_{\rm P}c^2$
 Value  1.220 932 x 1019 GeV
 Standard uncertainty  0.000 073 x 1019 GeV
  Relative standard uncertainty   6.0 x 10-5
 Concise form  1.220 932(73) x 1019 GeV    
 
Click here for correlation coefficient of this constant with other constants
Source: 2010 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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