The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
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tau energy equivalent
 $ m_{\rm\tau}/{\rm MeV} = 10^{-6} (m_{\rm\tau} c^2/{\rm J})/(e/{\rm C}) $
 Numerical value  1776.86 MeV
 Standard uncertainty     0.12 MeV
  Relative standard uncertainty  6.8 x 10-5
 Concise form  1776.86(12) MeV    
 
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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