Calcium Intake (RDA) Calculator

Health Updated 14 Jun 2026

Find your recommended daily calcium intake (RDA). Pick your age and life-stage group and this calculator returns the daily calcium target in milligrams, based on the Dietary Reference Intakes used by health authorities. Calcium keeps your bones and teeth strong and supports muscle and nerve function.

  • General RDA figures; needs vary with health and age.

Formula

RDA from standard dietary reference intakes (mg/day)
  • Recommended calcium intake is set by age and life stage, not calculated from body measurements.
  • Adults 19–50 and most men up to 70 need about 1,000 mg/day.
  • Teens 9–18 need the most — about 1,300 mg/day — to build peak bone mass.
  • Women over 50 and everyone over 70 need about 1,200 mg/day to slow bone loss.
  • Pregnancy and breastfeeding in adults stays around 1,000 mg/day (1,300 mg for teens).
  • Pair calcium with vitamin D, which your body needs to absorb it.

Adult aged 19–50

Inputs
  • Group: adult

For a healthy adult between 19 and 50, the recommended calcium intake is 1,000 mg per day — roughly three servings of dairy or fortified alternatives.

Frequently asked questions

How much calcium do I need per day?
It depends on your age and life stage: about 1,000 mg/day for adults 19–50, 1,300 mg for teens 9–18, and 1,200 mg for women over 50 and adults over 70.
Which foods are high in calcium?
Dairy (milk, yogurt, cheese), fortified plant milks and juices, tofu set with calcium, canned fish with bones, and leafy greens like kale and bok choy.
Can I get too much calcium?
Yes. The upper limit for adults is about 2,000–2,500 mg/day from food and supplements combined. Very high intakes may raise the risk of kidney stones.
Why do I need vitamin D too?
Vitamin D helps your gut absorb calcium. Without enough vitamin D, much of the calcium you eat passes through unused, so the two work together for bone health.
Should I take a supplement?
Aim to meet your needs through food first. If you fall short, a supplement can help — but talk to your doctor, especially if you have kidney issues or take other medications.

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