The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Constants
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Constants,
Units &
Uncertainty
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  Conversion from kg to J  
Conversion equation:  (1 kg)c2 = x J
x = {c2}
 
  Value of conversion factor:  x = 8.9 875 517 873 681 764 x 1016  
Your input value:  4.000 000 000 000 00... x 1041 kg 
 Your converted value:  3.595 020 714 947 27... x 1058 J 
 
Note: {Q} is the numerical value of Q when Q is expressed in SI units
 
Source: 2006 CODATA     
recommended values
 
Definition of
uncertainty
 
     Basis of conversion factors
for energy equivalents

 

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