The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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proton mass in u
 $m_{\rm p}$
 Numerical value  1.007 276 466 621 u
 Standard uncertainty  0.000 000 000 053 u
  Relative standard uncertainty  5.3 x 10-11
 Concise form  1.007 276 466 621(53) u    
 
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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