Calorie & TDEE Calculator for Kids & Teens (Ages 2–18) — Daily Maintenance Calories
Use this Child TDEE calculator to estimate maintenance calories (a child’s daily energy needs) for ages 2–18. It uses pediatric Estimated Energy Requirement (EER) equations from the Institute of Medicine (IOM) based on age, sex, height, weight, and activity level.
- Maintenance calories (kcal/day) + a typical range
- Calories by activity level chart + table
- Calculation steps (transparent math)
- Share/export tools (link, PDF/print, image)
- Methodology: exact pediatric/teen formula + PA activity multipliers
Helpful companions: Child & Teen BMI Calculator, Teen BMI Calculator, Teen BMI results explained. Adults 18+ should use our TDEE Calculator.
- This is a planning estimate, not a prescription.
- Kids/teens should not pursue aggressive calorie deficits or bulking without professional guidance.
- If there are concerns about growth, energy, eating behaviors, or rapid weight change, consult a pediatrician or registered dietitian.
A child/teen “TDEE” is the estimated calories per day to maintain weight while supporting normal growth. For ages 2–18, this page uses pediatric EER equations (not adult TDEE multipliers).
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Disclaimer: This calculator estimates daily calorie needs for generally healthy children and teens ages 2–18. It does not replace medical advice. Children with underweight, obesity, eating disorders, chronic illness, pregnancy, or sports-performance goals should be assessed by a pediatrician or registered dietitian. If you are considering intentional weight change for a child or teen, seek professional guidance first.
How Many Calories Does a Child or Teen Need Per Day?
Most parents searching for a “calorie calculator for kids” want one number: how much should my child be eating in a normal day? The useful answer is a range, not a single age-only target. Children and teens of the same age can differ by hundreds of calories per day because sex, body size, activity, and growth all matter.
What the calculator above gives you is a maintenance estimate — the daily energy needed to support the child’s current body size while also allowing for normal growth and development. For minors, “maintenance” is not the same idea as adult weight maintenance: energy also supports height gain, bone and muscle development, school-day concentration, and recovery from sport.
Daily calorie reference ranges by age and sex
These are broad reference bands, not prescriptions. They summarize federal estimated calorie needs across sedentary through active categories. Use the calculator above for a more individualized estimate.
| Age band | Girls (kcal/day) | Boys (kcal/day) |
|---|---|---|
| 2–3 years | 1,000–1,400 | 1,000–1,400 |
| 4–8 years | 1,200–1,800 | 1,200–2,000 |
| 9–13 years | 1,400–2,200 | 1,600–2,600 |
| 14–18 years | 1,800–2,400 | 2,000–3,200 |
Where these bands come from: Dietary Guidelines for Americans 2020–2025, Appendix 2, Table A2-2 (ODPHP-hosted PDF) , which reports estimated calorie needs by age, sex, and physical activity level. The lower end here reflects the sedentary entries and the upper end reflects the table’s active entries.
About USDA Table E3.1.A4: the government table you supplied lists selected “calorie level(s) assessed” when evaluating the nutrient adequacy of USDA Food Patterns. It is useful methodological context, but it is not itself a recommended-calorie-needs table, so those selected modeling levels are not used as intake ranges here. View Table E3.1.A4.
The current Dietary Guidelines for Americans 2025–2030 emphasizes that calorie needs depend on personal factors; USDA’s DRI Calculator for Healthcare Professionals uses age, sex, height, weight, and activity level for individualized estimates.
These bands are intentionally wide. A smaller, less-active teen and a larger teen training most days can have very different energy needs, even when they are the same age. Enter the child’s actual measurements and a realistic activity level above rather than treating an age row as an exact target.
How to use the result: treat it as a planning anchor and compare it with real-world signals over time — steady energy, normal growth, hunger and fullness cues, school concentration, and recovery from activity. If a child or teen is skipping meals, showing anxiety around food, losing weight unintentionally, or has a medical condition affecting growth or nutrition, seek guidance from a pediatrician or registered dietitian rather than relying on a calorie target.
How This Child Calorie Calculator Works (Pediatric EER Method)
This page estimates “child/teen TDEE” using pediatric Estimated Energy Requirement (EER) equations. People often say “TDEE” to mean “maintenance calories,” but for ages 2–18, pediatric guidance commonly uses EER because it’s designed for growing bodies.
- Convert units to metric values used by the equations.
- Select the correct age band: toddler (2.0–2.11), child (3–8), or teen/adolescent (9–18).
- Use sex-specific coefficients (male vs female).
- Apply activity (PA coefficient for ages 3–18) and a small growth allowance.
- Show a range because real needs vary day to day.
Methodology: Child & Teen Calorie Formula (IOM EER Equations)
This calculator uses Institute of Medicine (IOM) pediatric Estimated Energy Requirement (EER) equations for ages 2–18.
PA coefficients (activity multipliers)
| Sex | Sedentary | Low Active | Active | Very Active |
|---|---|---|---|---|
| Boys | 1.00 | 1.13 | 1.26 | 1.42 |
| Girls | 1.00 | 1.16 | 1.31 | 1.56 |
Equations used
Toddler (2.0–2.11 years): EER = (89 × weight_kg − 100) + 20 Ages 3–8: Male: EER = 88.5 − 61.9×age + PA×(26.7×weight_kg + 903×height_m) + 20 Female: EER = 135.3 − 30.8×age + PA×(10.0×weight_kg + 934×height_m) + 20 Ages 9–18 (teens/adolescents): Male: EER = 88.5 − 61.9×age + PA×(26.7×weight_kg + 903×height_m) + 25 Female: EER = 135.3 − 30.8×age + PA×(10.0×weight_kg + 934×height_m) + 25
Equations and PA coefficients are from the primary source: Institute of Medicine Dietary Reference Intakes for Energy (2005).
Worked example (adolescent male)
Example (adolescent male): 15 years 0 months, Male, 55 kg, 168 cm (1.68 m), Low Active (PA=1.13)
Growth allowance (age 9–18): +25
EER = 88.5 − 61.9×15 + 1.13×(26.7×55 + 903×1.68) + 25
= 2558.6 kcal/day (rounded to nearest 5 in the calculator)
Limitations of This Child & Teen Calorie Calculator
This calculator uses evidence-based pediatric EER equations, but it is still an estimate. Real calorie needs vary because children are growing and because real life is not “average.”
1) Individual variation (two kids can differ even with the same inputs)
Genetics, muscle mass, sleep, stress, puberty timing, and day-to-day movement (“non-exercise activity” like fidgeting, walking around, climbing stairs) can create meaningful differences between children with identical age/sex/height/weight/activity selections.
2) Medical conditions and medications are not accounted for
Chronic illness, digestive disorders, endocrine conditions (thyroid, diabetes), and certain medications can change appetite, absorption, or metabolism. If any of these apply, a clinician’s assessment is more appropriate than a general formula.
3) Not designed for special clinical situations
- Eating disorders or disordered eating
- Pregnant/breastfeeding adolescents
- Severe illness recovery, malnutrition, or medically supervised weight management
- Elite youth athletes with very high training loads
4) Input accuracy matters a lot
Height and weight errors (or choosing an activity level that doesn’t match the child’s typical week) can shift the estimate substantially. Use current measurements and a realistic activity selection.
5) Snapshot, not a treatment plan
This tool doesn’t interpret a growth chart trend, puberty stage, lab markers, or dietary quality. If growth or eating patterns are concerning, seek professional guidance.
Visual guide: Why child/teen formulas differ from adult TDEE
Visual guide: Activity level examples (sedentary → very active)
Questions People Ask About Kids’ and Teens’ Calorie Needs
This section stays open. Each question expands when clicked. Educational guidance only (not medical advice).
Q1: How does the Child TDEE Calculator estimate daily calories?
This calculator estimates maintenance calories for ages 2–18 using pediatric Estimated Energy Requirement (EER) equations published by the Institute of Medicine (IOM). Many people use “TDEE” to mean “maintenance calories,” but for kids and teens, EER is the better-designed framework because it’s built for growing bodies.
What “maintenance calories” means for minors
For a child or teen, “maintenance” is not only “maintain today’s scale weight.” It also means supporting normal: growth (height), development (bone, muscle), school concentration, mood stability, and (for athletes) recovery.
What the calculator actually uses
- Age (years + months) → selects the correct age-band equation.
- Sex → applies sex-specific coefficients and PA multipliers.
- Weight → directly changes energy requirement.
- Height (ages 3–18) → included inside the equation.
- Activity level (ages 3–18) → uses PA coefficients inside the equation.
Why you see a range
A child’s true daily needs swing with sleep, training days, growth spurts, illness recovery, and ordinary measurement noise. That’s why the calculator displays a “typical range” instead of pretending one number is perfect.
Q2: How does this calorie calculator for kids work?
The calculator follows a structured “pediatric logic” rather than an adult “BMR × multiplier” approach. It first identifies the child’s age band, then applies the correct IOM EER equation.
Step-by-step workflow
- Convert units to kg and meters (internally).
- Compute exact age (years + months).
- Select equation:
- 2.0–2.11: toddler shortcut (weight-based)
- 3–8: child equation (+20 growth allowance)
- 9–18: adolescent equation (+25 growth allowance)
- Apply PA coefficient for ages 3–18 based on activity category.
- Round and display a practical result + a realistic range.
Why it’s not “exact” (and why that’s normal)
Calorie needs are not a fixed constant. Kids also have “hidden movement” (fidgeting, pacing, standing, playing) that’s hard to capture perfectly. This is why tracking the trend (over weeks/months) matters more than obsessing over a single day.
Q3: Is this a TDEE calculator for teens (teen TDEE calculator)?
Yes. For ages 9–18, the calculator uses the adolescent EER equation (with a teen growth allowance). That’s why this works as a legitimate teen TDEE/maintenance calculator.
Why teen calorie needs can feel unpredictable
- Growth spurts: energy demand can rise even if activity stays the same.
- Puberty timing: two teens same age can be at different developmental stages.
- Sports seasons: training volume changes dramatically.
Practical way to use the number
If a teen is constantly tired, unusually hungry, not recovering from sport, or losing weight unintentionally, their true needs may be near the upper end of the displayed range (or beyond, for high-volume athletes).
Q4: Does this teen TDEE calculator work for female teens?
Yes. Selecting Female switches to female coefficients and female PA values in the IOM equations. This is essential because the reference data and average growth patterns differ by sex.
Why female teens sometimes notice swings
- Puberty changes body composition and appetite signals.
- Menstrual cycle can affect hunger, water retention, and scale weight (not fat gain).
- Training load changes (sports seasons) can significantly shift needs.
Common input mistakes (that make the result look wrong)
- Entering pounds while in metric mode (kg field).
- Entering height in cm but meaning inches.
- Choosing “Very Active” when activity is only occasional.
Q5: Why shouldn’t I use an adult TDEE or BMR calculator for my child?
Adult TDEE calculators are usually built like this: estimate adult BMR (resting needs) with an adult formula, then multiply by an activity factor. That system is not designed around pediatric growth and pediatric coefficients.
Key differences: adult vs pediatric
- Growth allowance: pediatric equations include a small extra term to reflect growth energy needs.
- Pediatric coefficients: energy relationships to height/weight differ in kids vs adults.
- Development: puberty timing and growth velocity affect needs.
What “wrong tool” can lead to
Using adult formulas on minors can underestimate needs during growth spurts, or overestimate if activity is misclassified. Either way, it can create unnecessary stress and poor planning.
Q6: What activity level should I choose?
Choose the level that matches a typical week over the month (school weeks matter most). If you pick an extreme that doesn’t match reality, the calorie estimate will drift.
Quick guide (examples)
| Level | What it usually looks like |
|---|---|
| Sedentary | Mostly sitting, minimal walking, no regular sports/exercise. |
| Low Active | Some daily movement (walking, casual play) but little structured training. |
| Active | Regular moderate activity most days (PE + sports practice a few days/week). |
| Very Active | Intense training most days (competitive sports, long practices, high daily movement). |
If you’re stuck between two levels
Start with Active, then adjust based on real outcomes over 2–4 weeks: stable growth trend, good energy, good sleep, good recovery = you’re close.
Q7: Why doesn’t activity level change the result for toddlers?
For ages 2.0–2.11, the calculator uses a toddler shortcut equation that depends on weight only. That means height and activity aren’t inputs to that formula, so changing them does not change the output.
Why a simpler toddler equation exists
Toddler activity can look chaotic and hard to categorize, and height measurement can be less reliable at that age. A weight-based approach is a practical shortcut for planning estimates.
How to use toddler results safely
- Use it for meal planning structure, not strict calorie targets.
- Watch growth chart trends and appetite patterns.
- Consult a pediatrician if there’s poor growth, persistent fatigue, or very rapid change.
Q8: Is this calculator free, and can I share results?
Yes. You can share a prefilled link that reopens the calculator with the same inputs, and you can export results via print/PDF or a downloadable image.
Privacy note (important for kids)
A share link typically contains the entered values in the URL. Share only with trusted people and avoid posting publicly.
Best use case
- Parent-to-parent coordination
- Coach + parent discussion for fueling (without guessing)
- Clinician visit preparation
Q9: Is this an NHS tool or an official country-specific tool?
No. This is an independent educational calculator. It uses publicly published IOM equations and provides sources. It is not an official NHS/CDC/WHO tool.
How you can verify reliability
- Check the Methodology section for the exact equations and PA coefficients.
- Compare with published IOM/Dietary Reference Intake documentation.
- Use results as a planning estimate, not as medical instruction.
Q10: Do kids in India need different equations?
The equation uses personal inputs (age, sex, height, weight, activity), not country. So the same formula can be applied broadly. However, regional clinical practices and nutrition guidance can differ.
What might differ by country/region
- Local dietary patterns and common deficiencies
- Local growth references used in clinics
- Public-health guidelines and screening thresholds
If the child has a medical condition or complex nutrition needs, local professional guidance should lead.
Q11: Can I use this child calorie calculator for weight loss?
Use extreme caution. For minors, self-directed calorie restriction can risk nutrient gaps, impaired growth, fatigue, injuries (for athletes), and disordered eating patterns.
Safer framing (education-only)
- Focus on routine quality: regular meals, fewer sugary drinks, adequate protein/fiber.
- Support sleep: poor sleep increases hunger signals and reduces activity energy.
- Increase enjoyable movement: walking, play, sport, active family time.
- Track growth trend over months, not daily weight changes.
Q12: Can I use this child TDEE calculator to gain weight?
Yes, as a baseline. But for minors, weight gain should prioritize nutrient adequacy and healthy growth, not just adding calories.
Better “weight gain” checklist
- Protein at meals
- Calcium + vitamin D for bone development
- Iron (especially for menstruating teens)
- Regular meals + planned snacks (often more effective than forcing huge meals)
Q13: Is 1500 calories enough for a 14-year-old boy?
It depends on height, weight, activity, and growth stage—but for many 14-year-old boys, especially active ones, 1500 kcal/day is often too low to be maintenance.
Why “age-only” questions don’t work
- A smaller sedentary teen and a taller athletic teen can have very different needs.
- Growth spurts can temporarily increase appetite and needs.
- Sports training can add large energy demands.
Practical next step
Use this calculator with accurate inputs. If it estimates (for example) 2400 kcal/day maintenance and someone is eating 1500, that’s not “maintenance”—it’s a large deficit for a growing teen.
Q14: Is 1200 calories okay for a 15-year-old?
In many cases, 1200 kcal/day is too low for a 15-year-old. It may not support growth, school performance, sports recovery, or adequate micronutrients.
Signs a teen may be under-fueled
- Persistent fatigue, dizziness, irritability
- Difficulty concentrating
- Frequent injuries or poor workout recovery
- In girls: menstrual irregularities (one possible sign among many)
Q15: How do I calculate calorie needs without a calculator?
You can calculate pediatric EER manually, but you must use the correct age band, correct units, and the correct PA coefficient. Most “manual” errors come from unit mistakes.
Manual checklist
- Select the correct equation (toddler vs 3–8 vs 9–18, male vs female).
- Convert weight to kg; convert height to meters.
- Select PA coefficient (sedentary/low/active/very active by sex).
- Compute and add growth allowance (+20 or +25 depending on age band).
Common mistakes
- Using cm instead of meters in the height term
- Using lb as if it were kg
- Using adult activity multipliers instead of pediatric PA coefficients
Q16: How do I calculate daily calories for a teenager?
For teenagers, use adolescent EER equations (pediatric method) rather than adult multipliers. Then treat the result as an estimate range that should be updated as growth and sports change.
Best practice
- Use accurate, recent height/weight.
- Pick realistic activity based on typical weeks.
- Re-check every few months (teens change fast).
- Use trends: energy, hunger, performance, and growth pattern.
Q17: How to calculate kg by age?
You generally can’t calculate a child’s weight from age alone. Healthy weights vary widely based on height, puberty timing, genetics, and body composition.
What to do instead
- Measure weight and height accurately.
- Use growth charts and track the trend over time.
- Discuss concerns with a pediatrician if there’s a sudden percentile shift or symptoms.
Sources
- Institute of Medicine / National Academies. Dietary Reference Intakes for Energy (2005) — primary reference for the pediatric EER equations and PA coefficients used by this calculator.
- U.S. Department of Agriculture and U.S. Department of Health and Human Services. Dietary Guidelines for Americans, 2020–2025 — Appendix 2, Table A2-2 (ODPHP-hosted PDF) — age-, sex-, and activity-specific calorie reference values summarized in the table above.
- USDA National Agricultural Library. DRI Calculator for Healthcare Professionals — individualized calorie and nutrient estimates based on DRI data.
- U.S. Department of Health and Human Services / USDA. Dietary Guidelines for Americans, 2025–2030 — current federal dietary guidance.
- CDC — physical activity guidance for children and adolescents .
- MedlinePlus — Child Nutrition .
- Johns Hopkins Medicine — Healthy Eating During Adolescence .
Methodological context only: USDA Food Patterns Table E3.1.A4 lists selected calorie levels used to assess food-pattern nutrient adequacy; it is not used here as a direct calorie-needs table.
See also our site methodology for how calculators are built, reviewed, and updated.