The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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  Conversion from J to Eh  
Conversion equation:  1 J = x Eh
x = 1 /{2Rhc}
 
  Value of conversion factor:  x = 2.293 712 317(28) x 1017  
Your input value:  1.380 650 400 000 00... x 10-23 J 
 Your converted value:  3.166 814 828(39) x 10-6 Eh 
 
Note: {Q} is the numerical value of Q when Q is expressed in SI units
 
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Basis of conversion factors
for energy equivalents

 

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