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Calcium Requirement Calculator

Work out calcium requirement instantly with clear inputs, formula shown and shareable results.

About Calcium Requirement Calculator

Applies the age and sex specific calcium reference intakes and converts any shortfall into 300 mg dairy-equivalent servings.

Formula

Calcium reference intakes

1,000 mg for most adults, 1,300 mg for ages 9 to 18, and 1,200 mg for women over 50 and everyone over 70

Worked example

With the default values below, Calcium Requirement Calculator returns Calcium requirement of 1,000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Ageaccepts 1–100 years
35 years
Sexone of Male, Female
Female
Current calcium intakeaccepts 0–3,000 mg
700 mg

Results

Calcium requirement
1,000 mg/day
Shortfall
300 mg/day
300 mg servings needed to close the gap
1.00
Share of the requirement met
70.0%

Step by step

  1. 1Values used
  2. 2Calcium reference intakes
  3. 3Calcium requirement= 1,000 mg/day
  4. 4Shortfall= 300 mg/day
  5. 5300 mg servings needed to close the gap= 1.00
  6. 6Share of the requirement met= 70.0

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
  • This is an estimate for general information and not professional medical advice. See the full disclaimer for the limits that apply to this kind of calculator.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.

Frequently Asked Questions

How much calcium is in a serving?

About 300 mg in 250 mL of milk, a small pot of yoghurt or 30 g of hard cheese.

Is supplementation advisable?

Food sources are preferred; supplemental calcium above requirements has been linked to cardiovascular and kidney stone risk.

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