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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: 2018 CODATA      recommended values  Definition of uncertainty       Basis of conversion factors for energy equivalents