Educational tool — not a diagnosis. VivMetric calculators estimate body and fitness metrics using CDC, WHO, and NIH reference formulas. They do not provide medical advice, diagnosis, or treatment.
Always consult a licensed healthcare provider for medical concerns. If you are in emotional distress or thinking about harming yourself, contact the 988 Suicide & Crisis Lifeline (call or text 988, US, 24/7) or see the WHO mental-health resources.
Child BMI Percentile Calculator (CDC)
For children and teens, BMI is evaluated against age-and-sex growth charts - a BMI of 20 is normal at 16 but not at 8. This tool estimates the BMI-for-age percentile and CDC category.
CDC categories
Underweight: below the 5th percentile. Healthy weight: 5th to below 85th. Overweight: 85th to below 95th. Obese: at or above the 95th percentile (CDC definitions).
Reference basis
Percentiles are approximate summaries of the CDC 2000 growth charts by age band. Pediatricians use the full age-month-specific curves - this is a convenient reference, not a clinical measurement.
Frequently Asked Questions
Is my child's BMI percentile a diagnosis?
No. BMI percentile is a screening tool. Growth velocity, family history, and clinical context matter - a pediatrician interprets the full picture.
What if my child is in the 90th percentile?
The 90th percentile is in the overweight category (85th-95th). It is worth a conversation with your pediatrician about growth trajectory, but it is not a diagnosis on its own.
This tool provides educational health metric estimations only. It is not medical advice, diagnosis, or treatment. Always consult a licensed healthcare provider for medical concerns.