DRI Calculator
Personalized Dietary Reference Intakes for all vitamins, minerals, and macronutrients based on official USDA/IOM guidelines
Select your age range. For infants, choose months.
Select your current life stage. Pregnancy and lactation have significantly different DRI values.
Activity level is used to estimate your daily calorie needs (TDEE).
Used to calculate BMI and protein needs based on body weight
Smokers require an additional 35 mg/day of Vitamin C
Enter Your Profile to See Your DRIs
Select your sex, age group, and life stage above to get personalized Dietary Reference Intake values for all vitamins, minerals, and macronutrients.
How to Use the DRI Calculator
Select Your Biological Sex and Age Group
Choose male or female and select your age range from the dropdown. For infants under 12 months, select the appropriate months range. DRI values vary substantially between age groups, reflecting the different growth, hormonal, and metabolic demands at each life stage.
Choose Your Life Stage and Activity Level
If you are pregnant or breastfeeding, select the appropriate option — DRI values change significantly for these conditions. Then select your physical activity level, which will be used to estimate your total daily energy expenditure (TDEE) and help visualize your macronutrient needs in context.
Enter Optional Physical Measurements
Optionally enter your height and weight to get a BMI calculation and more precise protein needs based on body weight (0.8 g/kg/day for adults). Toggle between US and metric units as needed. Check the smoker box if applicable to add the evidence-based vitamin C adjustment.
Review Your Personalized DRI Results
Your results will show all nutrient recommendations across four sections: energy needs, macronutrients with AMDR ranges, all 14 vitamins, and all 15 minerals. Toggle to see full tables with EAR and UL values alongside RDA/AI. Use the export CSV or print button to save your results. Pay special attention to the nutrient highlight cards which call out nutrients that are particularly important for your demographic.
Frequently Asked Questions
What is the difference between RDA, AI, EAR, and UL?
These four values are part of the Dietary Reference Intakes (DRI) framework established by the National Academies. The Estimated Average Requirement (EAR) is the intake level estimated to meet the needs of 50% of healthy individuals — it is primarily used for assessing population diets. The Recommended Dietary Allowance (RDA) is the intake level sufficient for nearly all healthy people (97-98%); it equals the EAR plus two standard deviations. When scientific data is insufficient to calculate an EAR and RDA, researchers set an Adequate Intake (AI), which is based on observed intakes in healthy populations. The Tolerable Upper Intake Level (UL) is the maximum daily intake unlikely to cause adverse effects — it is a safety ceiling, not a target. For healthy eating, the goal is to meet the RDA or AI while staying below the UL.
Do I really need to eat different amounts of nutrients during pregnancy?
Yes, pregnancy dramatically changes your nutritional requirements. Folate needs nearly double from 400 to 600 μg DFE/day to prevent neural tube defects — this is so critical that many experts recommend supplementing before conception occurs. Iron requirements jump to 27 mg/day to support expanded blood volume and fetal development. Iodine needs increase to 220 μg/day for fetal brain development. Choline increases to 450 mg/day. Protein needs increase to 71 g/day. Calorie needs increase modestly: no additional calories are needed in the first trimester, but 340 extra calories per day are recommended in the second trimester and 452 extra per day in the third. Lactation requires even more calories (330-400 extra per day) and increases requirements for vitamins A, C, and several B vitamins.
How are daily calorie needs estimated in this calculator?
The calculator uses the revised Harris-Benedict equations to estimate your Basal Metabolic Rate (BMR) — the calories your body needs at complete rest. For men: BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) − (5.677 × age). For women: BMR = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) − (4.330 × age). Your Total Daily Energy Expenditure (TDEE) is then calculated by multiplying BMR by an activity factor: 1.2 for sedentary, 1.375 for lightly active, 1.55 for moderately active, 1.725 for very active, and 1.9 for extremely active. For pregnancy and lactation, calorie additions are applied on top of TDEE. If you have not entered height and weight, an age- and sex-based reference calorie estimate is used instead.
Why do women aged 19–50 need so much more iron than men?
Premenopausal women lose iron through menstrual blood loss each month, which creates a significantly higher baseline need for iron replacement. Women aged 19–50 require 18 mg of iron per day, more than double the 8 mg per day needed by adult men and postmenopausal women. During pregnancy, iron requirements surge even higher to 27 mg/day to support the dramatic expansion of blood volume and the iron needs of the developing fetus. Iron deficiency is the most common nutritional deficiency globally, and menstruating women are the most vulnerable group. Signs of iron deficiency include fatigue, weakness, pale skin, and impaired cognitive performance. Foods rich in iron include red meat, poultry, seafood, beans, dark leafy greens, and iron-fortified cereals.
What does ND mean next to the Upper Intake Level for some nutrients?
ND stands for Not Determinable, which means that a Tolerable Upper Intake Level could not be established for that nutrient. This does not mean there is no risk from excessive intake — it means that the available scientific evidence was insufficient to identify a level at which adverse effects reliably occur. This is typically the case for nutrients found naturally in foods where toxicity from food sources has not been documented, such as vitamin K, thiamin, riboflavin, vitamin B12, pantothenic acid, and biotin. However, ND does not mean supplements are safe in unlimited doses. It is prudent to be cautious with high-dose supplementation of any nutrient unless under medical supervision. Very high doses of some ND nutrients from supplements have shown potential concerns in preliminary research.
Should I aim to eat exactly the RDA of every nutrient every day?
The RDA is designed as a daily average target over time, not a precise daily requirement. Because the body can store many nutrients (especially fat-soluble vitamins like A, D, E, and K, as well as minerals), it is acceptable to have some variation day to day as long as your intake averages at or above the RDA over weeks. However, water-soluble vitamins (C and all B vitamins) are not stored as efficiently and need more consistent daily intake. Rather than trying to hit every nutrient perfectly each day, focus on eating a varied, balanced diet rich in whole foods — fruits, vegetables, whole grains, legumes, lean proteins, dairy or fortified alternatives, and healthy fats. This approach naturally provides adequate amounts of most nutrients for healthy individuals. Supplementation should fill specific gaps identified by your healthcare provider, not replace dietary diversity.