''The Institute of Medicine recommends that adults 19 years old and older get 1,000 mg of calcium per day, with an upper limit of 2,000 mg. A recently published study revealed that taking excess calcium can be bad for your heart.''
Note that you'll have some in your diet. How much will vary. Try starting at 250mg a day and go to a high of 500mg in supplemental form over and above any in the diet.
Diet wise it's in milk based products (like cheese and yogurts), Broccoli and Sardines. A cup of milk, by way of example, contains 300mg