The amount of Calcium you need per day depends on your age and other factors. Adults 19 years and over should consume 1000 mg per day, with adult women over 51 years and all adults over 71 years needing 1200 mg per day. Children over age 9 and teens need 1300 mg per day. Calcium is found in a variety of foods, such as dairy products (milk, yogurt, cheese), kale, broccoli, and bok choi. It is also commonly added to foods fortified with nutrients, such as fruit juices, breads, and breakfast cereals.