Calcium Intake Calculator
Find your recommended daily calcium intake based on age and gender.
Includes food sources to help you meet your calcium needs.
How Daily Calcium Intake Is Calculated
Calcium is the most abundant mineral in the human body — 99% is stored in bones and teeth. Daily requirements change significantly with age, sex, and life stage. The calculation combines dietary sources and supplements to ensure you meet — but don’t far exceed — the recommended intake.
Recommended Daily Allowances (NIH):
| Age / Group | RDA |
|---|---|
| Children 1–3 | 700 mg/day |
| Children 4–8 | 1,000 mg/day |
| Teens 9–18 | 1,300 mg/day |
| Adults 19–50 | 1,000 mg/day |
| Women 51–70 | 1,200 mg/day |
| Men 51–70 | 1,000 mg/day |
| All adults 71+ | 1,200 mg/day |
| Pregnant/nursing | 1,000–1,300 mg/day |
Dietary calcium content of common foods:
- Milk (1 cup / 240 mL): 300 mg
- Yogurt (1 cup): 300–400 mg
- Cheddar cheese (1 oz): 200 mg
- Broccoli (1 cup cooked): 62 mg
- Almonds (1 oz): 75 mg
- Fortified orange juice (1 cup): 350 mg
- Canned sardines with bones (3 oz): 325 mg
Total intake formula:
Daily calcium = Σ (serving size × calcium per serving) + supplement dose
Supplement absorption note:
Calcium carbonate (most common supplement) absorbs best with food. Calcium citrate absorbs well even without food — preferred for those with low stomach acid or who take acid blockers.
Upper tolerable limit: 2,500 mg/day (adults under 51) and 2,000 mg/day (over 51). Excess calcium does not build stronger bones and may increase kidney stone risk.
Vitamin D3 (1,000–2,000 IU/day) is essential for calcium absorption — without adequate D3, even perfect dietary calcium intake is poorly utilized.