Sodium is a chemical element hence it does not have calories. Calories refer to the unit of energy contained in food substances. Calories are always used in reference to food substances.
Sodium is one of the essential minerals in the body. It is very important in the functioning of the nervous system. However, sodium has also been linked to risks of heart failure and stroke.
Sodium is not an energy giving substance in food. It does not contain any calories because it is nothing more than just a chemical element. Only chemical compounds used as food such as carbohydrates, fats, proteins etc that have chemical bonds in them can release such energy as calories.
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