Daily Calcium Intake Calculator
Recommended daily calcium intake by age and sex, based on NIH RDA guidelines.
A general population guideline (NIH RDA), not medical advice — talk to a healthcare provider about calcium needs if you have osteoporosis, kidney disease, or take medications that affect calcium absorption.
Recommended daily calcium
1000 mg
NIH RDA guideline
For informational and educational purposes only — not medical advice, and not a substitute for consulting a qualified professional about your specific situation. TrueMeasureKit is not liable for decisions made based on these results. See our Terms of Service.
Why the recommendation rises for women after 50
Calcium needs climb during adolescence to support rapid bone growth (1,300mg/day for teens), settle at 1,000mg/day through most of adulthood, then rise again later in life as bone density naturally declines. That second increase happens earlier for women — starting at 51, tied to the drop in estrogen after menopause, which accelerates bone loss — while men's requirement doesn't step up until 71. Dairy, leafy greens, and fortified foods are the most common dietary sources; supplementation is usually only necessary when diet alone falls short.
Frequently asked questions
Why does the recommended calcium intake increase for older adults?
Bone density naturally declines with age, particularly after menopause for women, so NIH RDA guidelines recommend higher calcium intake for older age groups to help support bone health.