A kilo calorie is equal to how many grams?

A kilogram and a kilocalorie are quite different things and are not simply related.

A kilogram is the SI unit of mass. A kilocalorie is 1000 'small' calories, and is used as an energy measure for food.

Because of the obvious possibility of confusion, the preferred unit of energy is the Joule.

All of these things may be studied in a on-line encyclopedia.