Micronutrient Calculator
HealthFind your daily vitamin and mineral RDA targets by age and sex, based on standard USDA dietary reference intakes for the key nutrients your body needs.
Vitamin B6
1.3
Vitamin A
700
Vitamin C
75
Vitamin D
15
Vitamin E
15
Vitamin K
90
Vitamin B12
2.4
Folate (B9)
400
Calcium
1,000
Iron
18
Magnesium
310
Zinc
8
Potassium
2,600
Sodium (Upper Limit)
2,300
What is a Micronutrients?
A Micronutrient Calculator shows your personalized daily targets for essential vitamins and minerals, based on standard Dietary Reference Intakes (DRI) published by nutrition authorities like the USDA and National Institutes of Health. While most people focus on calories and macronutrients (protein, fat, carbs) when planning their diet, micronutrients — vitamins and minerals needed in smaller amounts — are equally critical for immune function, bone health, energy production, and overall wellbeing.
This calculator adjusts RDA (Recommended Dietary Allowance) targets for 13 key nutrients based on your age and sex, since requirements for nutrients like iron, calcium, and vitamin B6 shift meaningfully across different life stages. It complements calorie and macro planning tools like the TDEE Calculator and Macro Calculator — hitting your calorie and protein targets doesn't guarantee adequate micronutrient intake, which depends heavily on food variety and quality rather than just quantity.
How to use this Micronutrients calculator
- Enter your Age using the slider or number field.
- Select your Sex — Male or Female — from the dropdown.
- Review the full table of RDA targets that appears immediately, covering all 13 vitamins and minerals.
- Compare your typical daily food intake or supplement labels against these personalized targets.
- Pay particular attention to nutrients you may be under-consuming based on your diet pattern (e.g. iron for vegetarians, calcium for those avoiding dairy).
- Use the Sodium Upper Limit as a ceiling to stay under, not a target to reach.
Formula & Methodology
This calculator applies standard adult Dietary Reference Intake (DRI) values published by the USDA and National Institutes of Health, adjusted by age bracket and sex: - Vitamin A: 900 mcg (male) / 700 mcg (female) - Vitamin C: 90 mg (male) / 75 mg (female) - Vitamin D: 15 mcg (600 IU) for adults under 70 - Vitamin E: 15 mg - Vitamin K: 120 mcg (male) / 90 mcg (female) - Vitamin B12: 2.4 mcg - Folate (B9): 400 mcg - Vitamin B6: 1.3 mg (rising to 1.7 mg male / 1.5 mg female after age 50) - Calcium: 1,000 mg (rising to 1,200 mg for women after age 50) - Iron: 8 mg (male) / 18 mg (female, dropping to 8 mg after menopause/age 50) - Magnesium: 400–420 mg (male) / 310–320 mg (female) - Zinc: 11 mg (male) / 8 mg (female) - Potassium: 3,400 mg (male) / 2,600 mg (female) - Sodium upper limit: 2,300 mg/day Worked example: A 55-year-old woman would see her Calcium target step up to 1,200 mg/day and her Iron target drop to 8 mg/day (reflecting reduced iron loss after menopause), while a 25-year-old woman would see a Calcium target of 1,000 mg/day and a higher Iron target of 18 mg/day.
Frequently Asked Questions
A micronutrient is a vitamin or mineral your body needs in small amounts to function properly — supporting immune function, bone health, energy metabolism, and nerve signaling, among other roles. Unlike macronutrients (protein, fat, carbs), micronutrients don't provide calories, but deficiencies in them can cause fatigue, weakened immunity, and long-term health problems. Getting adequate micronutrients daily is just as important as hitting your calorie and macro targets.
RDA (Recommended Dietary Allowance) is the average daily intake level sufficient to meet the nutrient needs of nearly all healthy people in a given age and sex group. It differs from an upper limit (like the sodium figure shown here), which represents the maximum daily intake unlikely to cause adverse health effects — for most nutrients, more isn't better beyond the RDA, and for a few like sodium, staying under the limit is the actual goal.
Men and women have different RDAs for several nutrients due to differences in body size, muscle mass, and physiological needs — women of reproductive age, for example, need substantially more iron than men to offset losses from menstruation. This calculator adjusts vitamin and mineral targets based on the sex you select to reflect these standard differences.
Yes, several nutrient requirements shift with age — vitamin B6 needs increase after age 50 for both sexes, and calcium requirements rise for women after age 50 to support bone density as estrogen levels decline. This calculator's age input adjusts the relevant targets to reflect these standard age-based changes in dietary reference intakes.
Yes, a varied diet with fruits, vegetables, whole grains, lean protein, and dairy or fortified alternatives can meet most people's micronutrient needs without supplementation. However, some groups — including strict vegans (vitamin B12), people with limited sun exposure (vitamin D), and menstruating women (iron) — commonly fall short and may need targeted food choices or supplements after consulting a healthcare provider.
Unlike the other nutrients shown, which are targets to meet or exceed, sodium is shown as an upper limit you should aim to stay under — excessive sodium intake is linked to high blood pressure and cardiovascular risk. The commonly cited limit is 2,300 mg per day, though many adults in the US and other countries consume significantly more than this through processed and restaurant food.
Enter your age and select your sex from the dropdown. The calculator immediately displays your daily RDA targets for 13 key vitamins and minerals — including Vitamin A, C, D, E, K, B12, folate, B6, calcium, iron, magnesium, zinc, and potassium — plus the sodium upper limit. Use these figures to check your diet or supplement label against your personal targets.
No, this calculator provides general population-based RDA targets and cannot detect an actual deficiency, which can only be confirmed through blood testing ordered by a healthcare provider. If you suspect a deficiency — from symptoms like persistent fatigue, hair loss, or brittle nails — consult a doctor rather than relying solely on dietary targets.
Vitamin B6 is highlighted here as a representative headline figure since it's commonly tracked and age-sensitive, but all 13 nutrient targets shown are equally important — none should be deprioritized relative to the others. Review the full table of results rather than focusing only on the highlighted value.
Micronutrient needs are independent of calorie intake — even someone eating a calorie-appropriate, high-protein diet can fall short on specific vitamins or minerals if their food choices lack variety. Pair this calculator with the [TDEE Calculator](/tdee-calculator/) or [Macro Calculator](/macro-calculator/) for total calorie and macro planning, then use these RDA figures to check the nutritional quality of the foods filling those calories.
For most vitamins and minerals, moderately exceeding the RDA through food is not harmful since the body regulates absorption and excretes excess amounts, particularly for water-soluble vitamins like C and the B-complex. However, high-dose supplementation of fat-soluble vitamins (A, D, E, K) or minerals like iron can accumulate to harmful levels, so supplement use beyond RDA amounts should be discussed with a healthcare provider.
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