Vitamins & Minerals
Calculator

Free, science-based calculator providing personalized RDA, AI & RDI nutrient targets — powered by NIH Dietary Reference Intakes.

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Medical Disclaimer: This algorithm generates generic nutritional targets based strictly on NIH Dietary Reference Intakes. It is NOT a medical diagnostic tool. Do not use these results to treat or diagnose any medical condition. By clicking calculate, you acknowledge that you should strictly consult a licensed physician before changing your diet or altering supplementation.

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Frequently Asked Questions

Quick answers about vitamin and mineral needs.

❓ What is RDA vs. AI?
The Recommended Dietary Allowance (RDA) meets the needs of 97–98% of healthy individuals. When evidence is insufficient for an RDA, an Adequate Intake (AI) is set instead, based on observed intakes of healthy people. Each nutrient in your results is marked accordingly.
🍎 Can I get all nutrients from food alone?
Yes — a well-balanced diet rich in fruits, vegetables, whole grains, and lean proteins can provide all essential nutrients. However, some individuals (pregnant women, vegans, etc.) may need supplementation. Always consult a healthcare provider before starting any supplement.
🤔 Vitamin vs. Mineral — what's the difference?
Vitamins are organic compounds made by plants or animals. Minerals are inorganic elements from the earth. Both are essential. Vitamins are classified as fat-soluble (A, D, E, K) or water-soluble (B-complex, C); minerals as major or trace.
⚠️ What does Tolerable Upper Intake Level (UL) mean?
The UL is the maximum daily intake unlikely to cause adverse effects for almost all individuals. It is not a recommended level. Some nutrients have no established UL because toxicity is very rare.
🎯 How accurate is this calculator?
The calculator uses Dietary Reference Intakes (DRIs) published by the NIH. It's an informational tool, not a diagnosis. Individual needs vary based on genetics, health conditions, and lifestyle. For personalized advice, consult a registered dietitian.
🔬 What logic is used for calculations?
  • Base Values: RDA/AI sourced from NIH DRIs, selected by age, gender, and status.
  • Energy (TDEE): Mifflin-St Jeor equation × activity multiplier.
  • Hydration: Gender-based baseline + activity, climate, and status adjustments.
  • Dietary: Vegan Iron ×1.8, Zinc ×1.5; sun exposure reduces Vitamin D target; Fiber = 14g per 1,000 kcal.
💡 Fat-soluble vs. Water-soluble vitamins?
  • Water-Soluble (B-vitamins, C): Dissolve in water, excreted quickly, need regular intake.
  • Fat-Soluble (A, D, E, K): Stored in body fat and liver — can accumulate, making UL awareness especially important for these vitamins.

🏃 Activity Levels

Sedentary: Office job, little/no exercise.

Lightly Active: Light exercise 1–3 days/week.

Moderately Active: Moderate exercise 3–5 days/week.

Very Active: Hard exercise 6–7 days/week.

Extra Active: Very hard daily exercise + physical job.

☀️ Sun Exposure

Vitamin D synthesis varies by skin tone, latitude, season, and time of day.

None: Work indoors, high-latitude, consistent sunscreen use. Uses standard RDA.

Moderate: 15–30 min midday sun on arms/face a few times/week. Dietary target significantly reduced.

High: Work outdoors or significant strong sun exposure. Dietary target set to zero.

🌡️ How Climate Affects Hydration

Your body loses more water through sweat in hot/humid conditions.

Temperate: Standard conditions — base hydration needs.

Hot / Humid: Hydration target increased to compensate for higher sweat loss.