Get personalized vitamin, mineral, and macronutrient recommendations based on your age, sex, weight, height, and activity level — backed by NASEM guidelines.
All fields are used to personalize your nutrient targets
Based on NASEM Dietary Reference Intakes
| Nutrient | Amount / Day | % Calories |
|---|
| Vitamin | RDA / AI | Upper Limit |
|---|
| Mineral | RDA / AI | Upper Limit |
|---|
The numbers above aren't generic recommendations. They're pulled from the National Academies of Sciences, Engineering, and Medicine (NASEM) tables — the same data the USDA, NIH, and registered dietitians use — and filtered to match your age, sex, weight, and life stage.
Each value comes from one of four reference types: RDA (your daily target), AI (used when research is thin — treat the same as RDA), UL (the safe ceiling), and EAR (a research figure you won't usually need). The calculator picks the right one for each nutrient automatically.
If you want to understand what each value means and why DRI replaced the old RDA system, read our full plain-English guide to DRI →
The math behind the calculator is simpler than it looks. Three things happen the moment you hit Calculate.
First, your calorie need. We use the Mifflin–St Jeor equation, published in 1990 and still the most accurate predictive equation for resting energy expenditure in healthy adults. It calculates your Basal Metabolic Rate from your weight, height, age, and sex — then multiplies that by your activity factor to give you Total Daily Energy Expenditure, the calories you actually burn in a normal day.
Second, your macros. Once we have your calorie target, we apply the Acceptable Macronutrient Distribution Ranges (AMDR) — the percentage of calories that should come from protein (10–35%), carbs (45–65%), and fat (20–35%). We convert those percentages into grams so you can actually use them.
Third, your micronutrients. This is where the NASEM tables come in. Your age, sex, and life stage (pregnant, lactating, or neither) point to a specific row in the DRI database. We pull the RDA or AI for every vitamin and mineral, plus the Tolerable Upper Intake Level (UL) so you know the safe ceiling.
If you've selected "Lose Weight," we subtract 500 kcal from your daily target — the standard deficit that produces about one pound of fat loss per week. "Gain Weight" adds 350 kcal, in line with the slow-gain approach most dietitians recommend for muscle building without excess fat.
Nothing here is invented. Every number traces back to a published source.
In short: Calories come from Mifflin–St Jeor + your activity level. Macros come from AMDR percentages. Vitamins and minerals come directly from NASEM DRI tables.
Most adults can use this tool to get a realistic picture of their daily nutrient needs. But it's especially useful in a few specific situations where guessing tends to go wrong.
Pregnant and lactating women see the biggest shift in requirements. Iron, folate, iodine, and choline all increase substantially during pregnancy, and the calculator adjusts for trimester-driven energy needs (+340 kcal in the second trimester, +452 in the third). If you've been told "eat for two," that's outdated — the real number is closer to "eat for 1.15."
Athletes and active adults need different calorie targets and often higher protein intake. The activity multiplier on the calculator handles the calorie side. For protein, the AMDR upper bound (35% of calories) gets you to the 1.6–2.2 g/kg range that sports nutrition research supports for muscle synthesis.
Adults over 50 quietly need more of several nutrients, not less. Vitamin D climbs from 15 µg to 20 µg after 70. Calcium increases for women over 50 (1,200 mg vs 1,000 mg). B12 absorption drops with age, so even though the RDA stays at 2.4 µg, supplementation is often advised.
Vegetarians and vegans can use the calculator like anyone else, but the calculator can't tell you bioavailability differs between plant and animal sources. Non-heme iron from plants is absorbed at roughly a third the rate of heme iron from meat. Plan accordingly.
People with medical conditions should treat these numbers as a starting point, not a prescription. Kidney disease, diabetes, malabsorption disorders, and certain medications all change your real requirements. Talk to a registered dietitian.
In short: This calculator works well for healthy adults, athletes, pregnant women, and older adults. Medical conditions need professional input.
The numbers above your results give you four headlines: calories, BMI, water, and BMR. Each tells you something different.
Calories is your daily target to maintain your current weight at your current activity level. Eat consistently around that number and your weight stays roughly stable. The 500 kcal deficit (for weight loss) or 350 kcal surplus (for gain) is built in if you selected one of those goals.
BMI is shown for reference but has known limits. It doesn't distinguish muscle from fat — heavily muscular adults often score "overweight" on BMI but are metabolically healthy. Use it as one data point, not a verdict.
Water is the total daily fluid intake from beverages and food combined. Around 20% of your water comes from what you eat. The visible drinking amount is roughly 80% of the total shown.
Macronutrient targets are ranges, not single numbers. Protein at 10–35% of calories is a wide range because real-world healthy diets vary that much. Most adults do well at the higher end of protein (25–30%) for satiety and lean mass, but the lower end works fine if your calorie target is high.
Vitamins and minerals are listed with the recommended target and the upper limit. The target meets the needs of 97–98% of healthy people for that age and sex. The UL is the safe ceiling — staying between these two numbers is the goal.
The most common mistake people make is reading the RDA as a strict daily quota. It isn't. Nutrient intakes average out over days and weeks, not within a single day. Hit your weekly average and you're fine.
In short: Treat the calorie number as a target, BMI as one data point, macros as a range, and micronutrient values as a floor with a ceiling above.
Your results show several types of numbers. The one you actually act on is the RDA or AI for each nutrient — your daily target. The UL is the safety ceiling; don't cross it regularly, especially when supplementing.
You'll sometimes see "% Daily Value (DV)" on food packaging. That's a different number — set by the FDA for labels using a generic 2,000 kcal diet. Don't confuse it with your personal RDA. The label says "20% DV iron" the same way for a 30-year-old man (8 mg need) and a pregnant woman (27 mg need) — three times the difference.
For a side-by-side breakdown of DRI, RDA, RDI, and DV with real-world examples, read our full DRI vs RDA guide →
Pick "Lose Weight" in the Health Goal dropdown and the calculator subtracts 500 kcal from your daily target. That's the standard deficit producing about one pound of fat loss per week — slow enough to keep your metabolism stable, fast enough to see results.
What stays the same in the results: your vitamin and mineral targets. Iron, calcium, magnesium, B-vitamins — none of these decrease when calories do. So the calorie number drops, but every calorie has to work harder. That's why a 1,500 kcal day of refined snacks leaves you depleted, while 1,500 kcal of lean protein, beans, eggs, and greens keeps you fed.
For the full weight-loss playbook (calorie floors, protein targets, mistakes to avoid), read our weight loss guide →
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Use the Calculator →Every value in this calculator traces back to a published, peer-reviewed source. Nothing is approximated or generic.
