You cannot.
A milligram is a measure of mass while a Joule is a measure of energy. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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To convert milligrams (mg) to joules, you need to know the substance's specific heat capacity. The formula to convert mass in milligrams to energy in joules is Energy (Joules) = Mass (grams) x Specific heat capacity (J/g°C) x Temperature change (°C). So, once you have the specific heat capacity, you can use this formula to convert mg to joules.
To convert from mega electronvolts (MeV) to joules, you can use the conversion factor 1 MeV = 1.602 x 10^-13 joules. So, to convert 474 MeV to joules: 474 MeV * 1.602 x 10^-13 joules = 7.595 x 10^-11 joules.
To convert joules to kilojoules, divide the number of joules by 1000. For example, to convert 5000 joules to kilojoules, you would divide 5000 by 1000 to get 5 kilojoules.
To convert mg to kg, divide by 1,000. 45654 mg = 45.654 kg.
1.097*10^7meters
To convert calories to joules, you can use the conversion factor 1 calorie = 4.184 joules. Thus, a 255 calorie snack bar would contain 1065.42 joules (255 calories * 4.184 joules/calorie).