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 J to kg  
Conversion equation:  (1 J)/c2 = x kg
x = 1 /{c2}
 
  Value of conversion factor:  x = 1.112 650 056... x 10-17  
Your input value:  1.000 000 000 000 00... J 
 Your converted value:  1.112 650 056 053 62... x 10-17 kg 
 
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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