Vitamin & Mineral Daily Needs Calculator
Calculate your personalized daily recommended dietary allowances (RDAs) and adequate intakes (AIs) for essential vitamins and minerals based on your age, biological sex, and life stage, using the National Academies of Sciences Dietary Reference Intakes.
Formula & Method
This calculator performs a direct table lookup against the official Dietary Reference Intakes (DRI) published by the National Academies of Sciences, Engineering, and Medicine. Each nutrient value is selected by matching the user's age bracket, biological sex, and life stage (normal, pregnant, or lactating) to the corresponding DRI table row:
DRI(nutrient) = Table[sex | life_stage][age_bracket]
Where age_bracket satisfies: min_age ≤ age ≤ max_age
RDA (Recommended Dietary Allowance):
= EAR + 2 × SD (meets needs of ~97.5% of healthy individuals)
AI (Adequate Intake):
= Observed/estimated intake assumed to be adequate
(used when insufficient data exist to establish an EAR/RDA)
Key nutrient units: Vitamin A in µg RAE (Retinol Activity Equivalents); Vitamin D in µg (1 µg = 40 IU); Vitamin E in mg α-tocopherol; Folate in µg DFE (Dietary Folate Equivalents); Niacin in mg NE (Niacin Equivalents).
Assumptions & References
- Values represent RDAs (cover ~97.5% of healthy individuals) or AIs where RDA is not established; they are not Tolerable Upper Intake Levels (ULs).
- Pregnancy and lactation options apply to females aged 14+ only, consistent with DRI age groupings.
- Values are for healthy individuals; medical conditions, medications, malabsorption disorders, or bariatric surgery may significantly alter requirements.
- Smokers require an additional 35 mg/day of Vitamin C above the listed RDA (not automatically added here).
- Adults over 50 may need Vitamin B12 from fortified foods or supplements due to reduced absorption from food-bound sources.
- Sodium values reflect the 2019 updated AI (reduced from prior recommendations).
- Primary source: National Academies of Sciences, Engineering, and Medicine. Dietary Reference Intakes tables (1997–2019). nationalacademies.org
- Secondary source: NIH Office of Dietary Supplements — Nutrient Fact Sheets. ods.od.nih.gov
- This tool is for educational purposes only and does not constitute medical or nutritional advice. Consult a registered dietitian or physician for personalized guidance.