What quantity of calories should i have daily?

Depends on Goals etc: Calories are a unit of heat, have no mass thus do not show on a scale ; most are used to just operate out brain ; constantly tear down ; rebuild our body ; calories are "potential" energy per a calorimeter. Thus body build, mental ; muscle mass, how we used our body day-in ; day-out are huge variables and the range of variation, from person to person, lifestyle to lifestyle, is extremely large.