B M I Percentile
Normal weight boy at school entry
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Evidence-based calculations Used in clinical settings worldwide Regular monitoring recommended
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Why: This calculation helps assess important health parameters for clinical and personal wellness tracking.
How: Enter your values above and the calculator will apply validated formulas to compute your results.
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👦 Healthy 6-Year-Old
Normal weight boy at school entry
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👧 Overweight 10-Year-Old
10-year-old girl with elevated BMI percentile
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⚽ Athletic Teen Boy
14-year-old soccer player with lean mass
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⚠️ Underweight 8-Year-Old
8-year-old with low BMI percentile
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🏥 Obese 12-Year-Old
12-year-old requiring intervention
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For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.
🏥 Health Facts
— WHO
— CDC
What is BMI Percentile?
BMI percentile is a measure that compares a child's BMI to other children of the same age and sex. Unlike adult BMI interpretation, children's BMI must be plotted on growth charts because body composition changes with age.
Below 5th
Underweight
5th-84th
Healthy Weight
85th-94th
Overweight
95th+
Obese
How is BMI Percentile Calculated?
This calculator uses the CDC 2000 growth charts and the LMS method to determine where your child's BMI falls relative to the reference population.
- Calculate BMI from weight and height
- Look up age and gender-specific LMS parameters
- Calculate z-score using the LMS formula
- Convert z-score to percentile
When to Use BMI Percentile
Routine Screening
- • Annual well-child visits
- • School health screenings
- • Sports physicals
Clinical Assessment
- • Obesity evaluation
- • Eating disorder screening
- • Growth monitoring
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