Child TDEE Calculator
Estimate daily calorie needs for kids and teens ages 2–18 using pediatric Estimated Energy Requirement (EER) equations based on age, sex, height, weight, and activity level.
This tool is part of our Health Calculators collection. You may also find our Child & Teen BMI Calculator helpful for assessing growth status.
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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, or sports-performance goals should be assessed by a pediatrician or registered dietitian. Planning targets are conservative estimates — always consult a professional before making dietary changes for a child.
How This Child TDEE Calculator Works
This calculator uses the Institute of Medicine (IOM) Estimated Energy Requirement (EER) equations — peer-reviewed formulas designed specifically for children and teens. Unlike adult TDEE formulas, these equations include an energy deposition component that accounts for normal growth.
For toddlers (ages 2 to 2 years 11 months), a simplified weight-based equation is used: EER = (89 × weight in kg − 100) + 20 kcal/day. For children ages 3–18, the calculator applies sex-specific equations that factor in age, weight, height, and physical activity level, with an additional 20 kcal/day (ages 3–8) or 25 kcal/day (ages 9–18) for growth.
Why Children’s Calorie Needs Differ from Adults
Growing bodies need extra energy beyond basic metabolism. The IOM equations add a growth energy component to support bone development, tissue growth, and pubertal changes. Activity coefficients are also calibrated differently for younger bodies, reflecting how children move and expend energy throughout the day.
For this reason, using an adult TDEE calculator for a child or teen would produce inaccurate results. Always use age-appropriate equations for pediatric calorie estimates.
Understanding Activity Levels
The IOM defines four Physical Activity Levels (PAL) used in these equations:
- Sedentary — Minimal movement beyond basic daily living (mostly sitting, screen time).
- Low Active — Some daily movement like walking to school, light play, or household chores.
- Active — Regular moderate activity such as organized sports, cycling, or active play most days.
- Very Active — Intensive daily training, competitive athletics, or highly physical lifestyles.
For most school-age children who participate in regular physical activity, Active is a reasonable starting point.
A Note on Calorie Changes for Children
The optional planning targets shown for ages 5–18 are conservative estimates (±15% of maintenance). They are intended as a starting point for conversations with healthcare providers — not as unsupervised dietary plans.
Pediatricians often recommend that children maintain their current calorie intake and allow natural growth to improve body composition, rather than actively restricting food. Intentional calorie reduction in children can interfere with growth, development, and psychological well-being if not properly supervised.
When to Consult a Professional
While this calculator provides a useful estimate, professional guidance is essential in several situations:
- BMI percentile below the 5th or above the 95th
- Chronic health conditions, food allergies, or dietary restrictions
- High athletic training demands or competitive sports goals
- Signs of disordered eating or food anxiety
- Significant recent changes in weight or appetite
A registered dietitian can create a personalized nutrition plan that supports healthy growth and development while addressing specific concerns.
Frequently Asked Questions
General guidance about BMI. Consult a healthcare professional for personalized advice.
Q1: How does the Child TDEE Calculator estimate daily calories?
A1: This calculator uses the Institute of Medicine (IOM) Estimated Energy Requirement (EER) equations, which are specifically designed for children and teens. For toddlers ages 2 to 2 years 11 months, it uses a simplified weight-based formula. For ages 3 to 18, it applies sex-specific equations that factor in age, weight, height, and physical activity level, plus an energy deposition component for growth.
Q2: Why shouldn’t I use an adult TDEE calculator for my child?
A2: Adult TDEE formulas such as Mifflin-St Jeor or Harris-Benedict do not account for the extra energy children need for growth, bone development, and puberty. They also use different activity multipliers. The pediatric EER equations used in this child TDEE calculator include a growth energy component and age-appropriate activity coefficients, producing more accurate estimates for ages 2 to 18.
Q3: What activity level should I choose for my child?
A3: Choose Sedentary for minimal daily movement, Low Active for light walking or play, Active for regular sports or moderate activity most days, and Very Active for intensive daily training. For most children who participate in regular physical activity, Active is a reasonable starting point.
Q4: Should I use the planning targets to change my child’s diet?
A4: The conservative planning targets shown for ages 5 to 18 are meant as a starting point for discussions with a pediatrician or dietitian, not for unsupervised use. Many pediatricians recommend maintaining current intake while the child grows rather than actively restricting calories.
Q5: Why doesn’t activity level affect the result for toddlers?
A5: For children ages 2 to 2 years 11 months, this calculator uses the IOM’s simplified toddler EER equation, which is based on weight alone. This formula already accounts for typical toddler activity and growth patterns, so a separate activity factor is not applied.
Looking for adult calorie estimates? Try our Adult BMI Calculator to evaluate body mass index alongside energy needs.
Sources
- School-Aged Child Nutrition Helpful feeding information for your school-age child. John Hopkins Medicine
- Centers for Disease Control and Prevention. “Tips for Maintaining Healthy Weight.” cdc.gov
- MedlinePlus. “Nutrition — Child and Adolescent.” U.S. National Library of Medicine. medlineplus.gov