Pediatric Calorie Calculator
Estimate daily calorie needs for infants, children, and teens (0–18 years) using pediatric equations and activity multipliers.
How this pediatric calorie calculator works
Pediatric calorie needs change quickly with age, growth velocity, and activity. This calculator uses evidence-based Estimated Energy Requirement (EER) formulas and then allows optional adjustments for illness/stress and clinical goals. It is designed as a practical screening tool for parents, coaches, and clinicians.
Unlike adult calculators, pediatric estimates are centered around growth and development. Children need enough energy not only for daily movement but also for tissue growth, hormone support, and brain development.
Formulas used in this tool
- Age 0–3 years: EER ≈ (89 × weight in kg − 100) + 20
- Boys 3–18 years: EER = 88.5 − (61.9 × age) + PA × [(26.7 × weight) + (903 × height in meters)] + 25
- Girls 3–18 years: EER = 135.3 − (30.8 × age) + PA × [(10.0 × weight) + (934 × height in meters)] + 25
PA is the physical activity coefficient selected from your activity level. The final value is then modified by stress and goal settings when selected.
How to use the calculator correctly
- Choose metric or imperial units.
- Enter age, sex, body weight, and height (height required at age 3+).
- Select the activity level that best reflects the child’s usual week.
- Add a stress factor only when clinically appropriate (for example, post-illness recovery).
- Review the estimated daily calorie target and suggested ranges.
Typical calorie patterns by age
| Age Group | General Pattern | Common Daily Range* |
|---|---|---|
| 0–12 months | Rapid growth; high kcal per kg | ~80–120 kcal/kg/day |
| 1–3 years | Growth slows, activity rises | ~1,000–1,400 kcal/day |
| 4–8 years | Steady growth and play needs | ~1,200–1,800 kcal/day |
| 9–13 years | Pre-teen growth acceleration | ~1,400–2,200+ kcal/day |
| 14–18 years | Puberty and sports variation | ~1,800–3,200+ kcal/day |
*Ranges vary by sex, body size, maturation, and sport volume.
Beyond calories: what else matters?
1) Protein for growth
Protein should support muscle, organ growth, and recovery. The calculator also estimates daily protein needs in grams based on age-specific g/kg guidance.
2) Hydration
Children often under-hydrate, especially in sports. The tool estimates maintenance fluid needs using a standard pediatric method (Holliday-Segar) to give a practical baseline.
3) Food quality and routine
- Prioritize whole foods: fruit, vegetables, dairy or alternatives, whole grains, beans, eggs, fish, lean meats.
- Use regular meal/snack timing to support appetite and school performance.
- Limit high-sugar drinks and ultra-processed snacks as default daily choices.
When to seek medical nutrition support
- Weight crossing percentiles rapidly (up or down)
- Poor linear growth or delayed puberty signs
- Frequent fatigue, dizziness, or recurrent injuries in youth athletes
- Digestive disease, food allergy complexity, diabetes, or kidney/liver conditions
- Any concern about restrictive eating or body image behaviors
FAQ
Is this calculator accurate for infants?
It provides a general estimate. Infant feeding should still be guided by pediatric follow-up, growth charts, diaper counts, and developmental cues.
Can I use this for weight loss in a child?
Weight reduction in children should be clinician-supervised, except in specific adolescent contexts. Usually the focus is healthier growth trajectory rather than aggressive calorie restriction.
How often should I recalculate?
Recalculate every 1–3 months or after meaningful changes in growth, activity, training season, or health status.