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Daily Vitamin D Requirement Calculator

Enter age and pregnancy status to find the daily vitamin D target.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

Dietary guidelines set a Recommended Dietary Allowance (RDA) for vitamin D that varies by age and life stage — typically around 600 IU/day for most children and adults, rising to about 800 IU/day for adults over 70, with pregnancy and breastfeeding sometimes carrying their own guidance. Vitamin D is measured in both International Units (IU) and micrograms (mcg), related by 1 mcg = 40 IU.

Dietitians and healthcare providers use these figures when advising on supplementation, especially for people with limited sun exposure, darker skin, or conditions that reduce absorption, and individuals use the calculator to check how a supplement's IU or mcg dose stacks up against their age-based target.

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