How are overweight and obesity defined in children?

BMI-for-age percentile: underweight below 5th, healthy weight 5th–84th, overweight 85th–94th, obese 95th–119% of 95th, severely obese 120% or more of 95th percentile. Adult cutoffs of 25 and 30 kg/m2 do not apply to children due to age-related BMI changes.

Should BMI percentile be used as the sole obesity screen?

BMI percentile is a screening tool, not a diagnostic test for adiposity. Children with high muscle mass may have elevated BMI. DXA or waist circumference adds specificity. Metabolic risk assessment (blood pressure, fasting glucose, lipids) is needed regardless of BMI for high-risk children.

CDC BMI Percentile (Ages 2–20)

Calculate and interpret BMI percentile for children and adolescents aged 2–20 years using CDC growth charts, classifying underweight, healthy weight, overweight, and obese categories.

Use the full interactive calculator below, or

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CDC BMI Percentile (Ages 2–20)

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Frequently Asked Questions

How are overweight and obesity defined in children?

Should BMI percentile be used as the sole obesity screen?