Micronutrient Calculator
Enter your age, sex and life stage, then select any vitamin or mineral to see your personalised Dietary Reference Intake (DRI). The calculator uses the 2019 National Academies of Sciences, Engineering, and Medicine values, showing the Recommended Dietary Allowance (RDA) or Adequate Intake (AI) where an RDA has not been set, plus the Tolerable Upper Intake Level (UL). Enter how much of the nutrient you typically consume each day to see what percentage of your target you are meeting.
What are micronutrients and why do they matter?
Micronutrients are vitamins and minerals your body needs in relatively small quantities but cannot make on its own in sufficient amounts. They differ from macronutrients (carbohydrates, proteins and fats) in that they do not provide energy, but they are essential for almost every physiological process: enzymatic reactions, immune defence, nerve signalling, bone mineralisation, blood clotting, oxygen transport and DNA synthesis. A sustained shortfall in even one micronutrient can lead to well-defined deficiency diseases: lack of vitamin C causes scurvy, lack of vitamin D leads to rickets or osteomalacia, and iron deficiency is the most common nutritional anaemia worldwide. Over-consumption of certain micronutrients, particularly fat-soluble vitamins and some minerals, can also be harmful, which is why the Tolerable Upper Intake Level (UL) exists alongside the recommended intake.
Understanding DRI: RDA, AI and UL
The Dietary Reference Intakes (DRI) framework was developed by the National Academies of Sciences, Engineering, and Medicine (NASEM) and is used across the United States and Canada. It replaces the older Recommended Daily Allowances (RDA). The framework has several reference values: the Estimated Average Requirement (EAR) meets the needs of 50% of healthy individuals; the Recommended Dietary Allowance (RDA) is set roughly two standard deviations above the EAR and meets the needs of 97 to 98 percent of healthy people. When data are insufficient to set an EAR and RDA, an Adequate Intake (AI) is used instead - it is based on observed average intakes of healthy populations. The UL is the highest daily intake that is unlikely to cause adverse effects for most people. This calculator displays the RDA where one exists or the AI where it does not, along with the UL. None of these values are therapeutic doses or medical recommendations.
How life stage changes your requirements
DRI values change substantially across the lifespan. Children aged 1-3 need far less calcium, iron and most vitamins than teenagers, whose rapid growth drives higher requirements across almost every nutrient. Men and women have different DRIs for several nutrients: women of reproductive age need roughly twice the iron of men (18 mg vs 8 mg) because of menstrual losses, while men need more zinc and vitamin K. Pregnancy dramatically raises requirements for folate (up to 600 mcg DFE vs the standard 400), iodine, iron and choline, because these nutrients support fetal neural development, red blood cell expansion and placental function. Breastfeeding increases needs for vitamins A, C and B12 as well as iodine and choline. After age 50, calcium and vitamin D needs rise for both sexes as bone turnover increases, and the vitamin B6 and vitamin B12 requirements for men increase to account for reduced gastric absorption.
Common micronutrient shortfalls and food sources
National dietary surveys consistently flag several nutrients as under-consumed. Vitamin D is low in most people living above 37 degrees latitude who spend limited time outdoors; food sources include fatty fish, egg yolks and fortified dairy, and supplementation is often needed. Iron deficiency is the most common nutritional disorder globally, especially in premenstrual women and young children; red meat, legumes, fortified cereals and leafy greens are key sources. Calcium insufficiency is common in people who avoid dairy, and can be addressed through calcium-set tofu, canned fish with bones, fortified plant milks and dark leafy greens. Potassium and magnesium are consistently below recommended levels in Western diets; both are found in vegetables, legumes, nuts and whole grains. Iodine intake has fallen in some countries as sea salt replaced iodised salt; seafood and dairy remain primary sources. The UL matters most for supplemented nutrients: excessive vitamin A from retinol supplements can cause liver damage and is teratogenic in pregnancy, while excess iron causes gastrointestinal problems and oxidative stress.
Selected adult DRI values (ages 19-50)
| Nutrient | Male RDA/AI | Female RDA/AI | UL (adults) | Unit |
|---|---|---|---|---|
| Vitamin A | 900 | 700 | 3000 | mcg RAE |
| Vitamin C | 90 | 75 | 2000 | mg |
| Vitamin D | 15 | 15 | 100 | mcg |
| Vitamin E | 15 | 15 | 1000 | mg AT |
| Vitamin K | 120 (AI) | 90 (AI) | None | mcg |
| Thiamin (B1) | 1.2 | 1.1 | None | mg |
| Riboflavin (B2) | 1.3 | 1.1 | None | mg |
| Niacin (B3) | 16 | 14 | 35 | mg NE |
| Vitamin B6 | 1.3 | 1.3 | 100 | mg |
| Folate (B9) | 400 | 400 | 1000 | mcg DFE |
| Vitamin B12 | 2.4 | 2.4 | None | mcg |
| Pantothenic Acid | 5 (AI) | 5 (AI) | None | mg |
| Biotin | 30 (AI) | 30 (AI) | None | mcg |
| Choline | 550 (AI) | 425 (AI) | 3500 | mg |
| Calcium | 1000 | 1000 | 2500 | mg |
| Iron | 8 | 18 | 45 | mg |
| Magnesium | 400-420 | 310-320 | 350 | mg |
| Zinc | 11 | 8 | 40 | mg |
| Iodine | 150 | 150 | 1100 | mcg |
| Selenium | 55 | 55 | 400 | mcg |
| Potassium | 3400 (AI) | 2600 (AI) | None | mg |
| Sodium | 1500 (AI) | 1500 (AI) | 2300 | mg |
RDA = Recommended Dietary Allowance. AI = Adequate Intake (used when RDA is not established). UL = Tolerable Upper Intake Level. Source: NASEM 2019.
Frequently asked questions
What is the difference between RDA and AI?
The Recommended Dietary Allowance (RDA) is based on a well-established Estimated Average Requirement: it meets the needs of 97 to 98 percent of healthy people in the group. The Adequate Intake (AI) is used when the evidence base is insufficient to calculate an EAR - it is an observed or estimated intake level assumed to be adequate. When you see an AI, it means the science is less settled, but the value is still useful as a practical target.
What is the Tolerable Upper Intake Level (UL)?
The UL is the highest daily intake of a nutrient from all sources (food, fortified foods and supplements combined) that is unlikely to cause adverse health effects in almost all healthy people. It is not a goal or a recommended level - it is a safety ceiling. Some nutrients have no established UL because the data on toxicity are insufficient, not because there is no risk at very high intakes.
Do I need to meet the RDA every single day?
No. The RDA is a daily average over time, not a target to hit each day. For most vitamins and minerals, your body can buffer shortfalls over a few days. What matters is your habitual intake averaged over weeks. However, some nutrients like folate are particularly important to maintain consistently, especially during early pregnancy.
Why does the calculator show different values for men and women?
Biological sex affects how much of certain nutrients is needed. The clearest example is iron: women of reproductive age need 18 mg per day versus 8 mg for men, due to menstrual blood losses. Men generally need more zinc and vitamin K. After menopause, women no longer have the higher iron requirement. Pregnancy and breastfeeding create a third set of values with substantially elevated needs for folate, iodine, iron and choline.
Can I use this calculator to check if I am deficient?
This calculator compares your self-reported intake to population-level reference values. It cannot diagnose a deficiency. True deficiency is confirmed by blood or urine tests ordered by a healthcare provider. Many factors affect how your body absorbs and uses micronutrients - gut health, medications, genetics and food preparation methods all matter. Use the calculator as a starting point to identify nutrients worth discussing with a doctor or registered dietitian.
Are the DRI values the same as the Daily Value (DV) on food labels?
Not exactly. The Daily Values used on US food and supplement labels are set by the FDA and are based on a 2000-calorie diet for a general adult population. They are simplified reference points for labelling purposes. The DRI values used in this calculator are more detailed: they are specific to your age group, sex and life stage, and they include the RDA, AI and UL distinctions that the label DV does not show.