MyPlate Calculator Methodology — Every EER Formula & Source
See the real math behind your MyPlate calorie level: the IOM & NASEM EER equations, USDA food-pattern tables, and PA coefficients — nothing hidden, all sourced.
How these numbers are verified
Every calculator result on this page is pinned to a published federal table or equation and re-checked automatically on each release — part of 39 reproducible scenarios (spanning this and the other calculators) run against the live calculation code every time the site is built. A few examples:
| Scenario | Expected | Source |
|---|---|---|
| 40-year-old active man, 180 cm, 80 kg (IOM 2005) | 3,086 kcal/day | IOM (2005) DRIs for Energy — adult-male EER equation (age 19+) |
| 40-year-old active man, 180 cm, 80 kg (NASEM 2023) | 3,018 kcal/day | NASEM (2023) DRIs for Energy (NBK591021) — adult-male Active regression |
| Iron RDA for women 31–50 | 18 mg | IOM (2006) DRIs: The Essential Guide to Nutrient Requirements — iron RDA |
| Healthy U.S.-Style daily amounts at 2,000 kcal | Fruits 2 c · Vegetables 2.5 c · Grains 6 oz-eq · Protein 5.5 oz-eq · Dairy 3 c · Oils 27 g | Dietary Guidelines for Americans 2020–2025, Appendix 3 — Healthy U.S.-Style Pattern |
| Adult, 178 cm, 81.65 kg → BMI 25.8 | 25.8 · Overweight | WHO adult BMI cutoffs (underweight <18.5, normal <25, overweight <30, obese ≥30) |
See the full table of all 39 verification scenarios on the editorial policy page.
1. How Your Calorie Level Is Calculated
Your Estimated Energy Requirement (EER) is calculated using equations from the Institute of Medicine's Dietary Reference Intakes (2002/2005). These equations take into account age, sex, height, weight, and physical activity level.
IOM 2005 equations (default) — PA = Physical Activity coefficient, H in meters
| Group | EER Equation |
|---|---|
| Toddler (age 2) | 89 × W − 100 + 20 |
| Boys 3–8 | 88.5 − 61.9×A + PA × (26.7×W + 903×H) + 20 |
| Boys 9–18 | 88.5 − 61.9×A + PA × (26.7×W + 903×H) + 25 |
| Girls 3–8 | 135.3 − 30.8×A + PA × (10.0×W + 934×H) + 20 |
| Girls 9–18 | 135.3 − 30.8×A + PA × (10.0×W + 934×H) + 25 |
| Adult Male (19+) | 662 − 9.53×A + PA × (15.91×W + 539.6×H) |
| Adult Female (19+) | 354 − 6.91×A + PA × (9.36×W + 726×H) |
Variable Definitions
- A = Age in years
- W = Weight in kilograms (lbs × 0.4536)
- H = Height in meters (total inches × 0.0254)
- PA = Physical Activity coefficient (see table below)
- +20 / +25 = Energy deposition for growth (children/adolescents)
Two DRI editions
The calculator ships both editions. By default it uses the IOM 2005 equations above — the ones the USDA MyPlate tools used — and you can switch to the current NASEM 2023 set from the Advanced control on the calculator. Your choice is remembered on this device. In IOM 2005 mode, toddlers (ages 1 to under 3) use the true 2005 form, EER = 89 × W − 100 + 20 (the 13–35-month band shown in the table above); earlier versions accidentally ran the 2023 toddler equation here.
The NASEM 2023 equations
In 2023 the National Academies re-derived the EER from newer doubly-labeled-water data. Each activity level is its own regression — there is no PA multiplier — and the terms use age in years, height in centimeters, and weight in kilograms. Adults have no growth term; children ages 3–18 add a small growth allowance.
| Adult Men (19+) | |
|---|---|
| Activity tier | EER Equation (kcal/day) |
| Inactive | 753.07 − 10.83×A + 6.50×H + 14.10×W |
| Low active | 581.47 − 10.83×A + 8.30×H + 14.94×W |
| Active | 1004.82 − 10.83×A + 6.52×H + 15.91×W |
| Very active | −517.88 − 10.83×A + 15.61×H + 19.11×W |
| Adult Women (19+) | |
|---|---|
| Activity tier | EER Equation (kcal/day) |
| Inactive | 584.90 − 7.01×A + 5.72×H + 11.71×W |
| Low active | 575.77 − 7.01×A + 6.60×H + 12.14×W |
| Active | 710.25 − 7.01×A + 6.54×H + 12.34×W |
| Very active | 511.83 − 7.01×A + 9.07×H + 12.56×W |
| Boys (3–18) | |
|---|---|
| Activity tier | EER Equation (kcal/day) |
| Inactive | −447.51 + 3.68×A + 13.01×H + 13.15×W + growth |
| Low active | 19.12 + 3.68×A + 8.62×H + 20.28×W + growth |
| Active | −388.19 + 3.68×A + 12.66×H + 20.46×W + growth |
| Very active | −671.75 + 3.68×A + 15.38×H + 23.25×W + growth |
| Girls (3–18) | |
|---|---|
| Activity tier | EER Equation (kcal/day) |
| Inactive | 55.59 − 22.25×A + 8.43×H + 17.07×W + growth |
| Low active | −297.54 − 22.25×A + 12.77×H + 14.73×W + growth |
| Active | −189.55 − 22.25×A + 11.74×H + 18.34×W + growth |
| Very active | −709.59 − 22.25×A + 18.22×H + 14.25×W + growth |
H = height in centimeters (the IOM 2005 table above uses meters), W = weight in kilograms, A = age in years. Young children (under 3) use the same toddler equations in both editions.
Children add a growth (energy-deposition) allowance: boys +20 kcal at age 3, +15 (ages 4–8), +25 (9–13), +20 (14–18); girls +15 (ages 3–8), +30 (9–13), +20 (14–18).
Activity mapping & PAL bands
Each site activity level maps positionally to a NASEM tier: Sedentary → Inactive, Moderately active → Low active, Active → Active, Very active → Very active. The 2023 report defines these by physical-activity level (PAL) for adults: Inactive 1.00–1.53, Low active 1.53–1.68, Active 1.68–1.85, Very active 1.85–2.50. Our “moderately active” label corresponds to the report's Low-active band (≈ daily living plus about 30–40 minutes/day of brisk walking).
6. DRI Calculator Methodology
The DRI Calculator provides personalized vitamin, mineral, and macronutrient recommendations based on the Dietary Reference Intakes (DRIs) established by the National Academies of Sciences, Engineering and Medicine. It uses the same EER equations and BMI formula as the Food Pattern Calculator (Sections 1–5 above), plus nutrient-specific reference values.
Reference Value Types
- RDA — Recommended Dietary Allowance — the average daily intake sufficient to meet the nutrient requirements of nearly all (97–98%) healthy individuals in a group.
- AI — Adequate Intake — the recommended average daily intake based on observed or experimentally determined approximations. Used when an RDA cannot be determined.
- UL — Tolerable Upper Intake Level — the highest average daily nutrient intake level likely to pose no risk of adverse health effects to almost all individuals.
- CDRR — Chronic Disease Risk Reduction Intake — intake level above which reducing intake is expected to lower chronic disease risk.
- AMDR — Acceptable Macronutrient Distribution Range — the range of intake for an energy source (carbohydrate, fat) associated with reduced risk of chronic disease while providing adequate intakes of essential nutrients. Expressed as a percentage of total calories, then converted to grams using your estimated calorie needs.
7. Sources & Citations
- Dietary Guidelines for Americans, 2020–2025 — U.S. Department of Agriculture and U.S. Department of Health and Human Services.
- Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids — Institute of Medicine, National Academies Press, 2002/2005.
- Dietary Reference Intakes: The Essential Guide to Nutrient Requirements — Institute of Medicine, National Academies Press, 2006.
- Dietary Reference Intakes for Calcium and Vitamin D — Institute of Medicine, National Academies Press, 2011.
- Dietary Reference Intakes for Sodium and Potassium — National Academies of Sciences, Engineering and Medicine, 2019.
- CDC Growth Charts — Centers for Disease Control and Prevention. BMI-for-age percentile charts for children and adolescents.
- Dietary Reference Intakes for Energy — National Academies of Sciences, Engineering, and Medicine, 2023 (NBK591021). Source of the NASEM 2023 EER equations.
Frequently asked questions
Where do these calculations come from?
Three public sources: the USDA Dietary Guidelines for Americans, 2020–2025 edition (food group patterns and dietary patterns); the National Academies' Dietary Reference Intakes (DRIs) for energy, macronutrients, vitamins, and minerals; and the IOM Estimated Energy Requirement (EER) equations for personalized calorie needs. Every number we display has a documented federal-source citation.
Are these the same numbers the USDA published?
Yes. We use the published EER equations, the USDA Food Patterns table at 12 calorie levels (1,000–3,200 kcal), and the National Academies DRI tables verbatim. We do not adjust, smooth, or extrapolate the source data. Any output you see is reproducible from the published tables.
What changed in January 2026?
On January 7, 2026, USDA and HHS released the 2025–2030 Dietary Guidelines for Americans, launched RealFood.gov as the new consumer-facing nutrition site, and retired the MyPlate.gov website. The 2025–2030 edition replaced the MyPlate visual with an inverted food pyramid emphasizing "real food." The MyPlate Plan calculator was removed. MyPlate.food continues to implement the 2020–2025 Dietary Guidelines tables — the last edition that featured MyPlate as the federal nutrition icon.
Why isn't this on RealFood.gov?
RealFood.gov, launched January 7, 2026, is built around the new 2025–2030 edition, an AI meal-planning assistant, and educational content rather than a personalized MyPlate-format calculator. The interactive MyPlate Plan calculator was removed during the transition and not rebuilt. MyPlate.food fills that gap as an independent project. We are not affiliated with USDA — see the footer disclaimer.
How accurate are DRI values for individuals vs. populations?
DRIs (RDAs and AIs) are population-level reference values designed so that 97–98% of healthy individuals in a life-stage group meet their needs at the recommended intake. Individual needs vary based on genetics, health status, medications, and physical activity. Use DRI values as a starting point and consult a registered dietitian or clinician for individualized guidance.
Why do my calorie needs differ from another calculator?
Different tools use different equations. We use the IOM Estimated Energy Requirement equations published in the Dietary Reference Intakes for Energy. Other calculators use Mifflin–St Jeor, Harris–Benedict, or proprietary regressions, which can differ by 100–300 kcal/day. The federal MyPlate Plan tool used IOM EER, which is what we use here.
Are these recommendations medical advice?
No. The calculator outputs estimates derived from public federal nutrition guidance for healthy individuals. They are not personalized medical advice and are not a substitute for evaluation by a registered dietitian, physician, or other qualified health professional. People with specific clinical conditions (diabetes, kidney disease, eating disorders, pregnancy complications, etc.) should consult a clinician before changing their diet.
How often is this calculator updated?
The Dietary Guidelines for Americans are revised every five years by USDA and HHS jointly. The 2025–2030 edition was released January 7, 2026 and replaced the MyPlate visual with an inverted food pyramid. MyPlate.food continues to implement the 2020–2025 edition by design — to remain a MyPlate-format calculator. The DRI tables are revised by the National Academies on their own multi-year cadence per nutrient.