Child BMI Calculator
Calculate BMI for children and teens (ages 2-20) and interpret the result based on age and sex percentiles.
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Result
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Formula
Calculates the raw Body Mass Index. For children, the raw number is then compared to a growth chart of other children of the same age and sex.
Worked Example
Frequently Asked Questions
Why use percentiles?
Children's body fat levels change as they grow, and differ between boys and girls. Raw BMI numbers are less meaningful than where they fall relative to peers.
What are the categories?
Healthy weight: 5th to <85th percentile; Overweight: 85th to <95th percentile; Obesity: 95th percentile or greater.
Is BMI always accurate?
It is a screening tool, not a diagnosis. A child with high muscle mass may have a high BMI without having high body fat.
Medical Disclaimer
This calculator is provided for informational and educational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any decisions based on these results. Do not disregard or delay seeking medical advice because of information obtained from this tool.
AI Assistant
Ask about this calculator
I can help you understand the child bmi calculator formula, interpret your results, and answer follow-up questions.
Try asking
Our AI assistant provides general estimates and advice only. Please consult a qualified healthcare professional before making any health-related decisions.
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