How much calcium supplement is needed for women?

Varies. The recommendation for supplementation depends on your age and dietary intake. First, look up the recommended intake for your age and calculate your calcium intake. Roughly, each serving of dairy has about 300 mg of calcium and a balanced diet without dairy has about 300-400 mg of calcium. Then supplement up to your recommended intake, if necessary.
People need less. Calcium than previously thought. Please don't take it by itself but get a product that contains co-factors such as d, k, boron, etc, . They the calcium will go to your bones and not your blood vessels.