From age 9 to 18, males and females need 1300mg of calcium per day, which is the equivalent of about 4 servings of dairy products. After the age of 19, your needs drop to around 1000mg/day (~ 3 servings of dairy products). During pregnancy and breastfeeding, and after menopause, women's needs rise to around 1500mg. Female athletes diagnosed with amenorrhea may be encouraged to consume 1500mg/day until their menses are restored. Men who are significantly underweight and/or undernourished, and who have decreased testosterone levels as a result, may also be encouraged to consume 1500 mg of calcium per day until they are weight restored.