Head Circumference Percentile

Determine head circumference percentile by age and sex using CDC growth charts. Microcephaly <3rd percentile, macrocephaly >97th percentile.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Determine head circumference percentile by age and sex using CDC growth charts. Microcephaly <3rd percentile, macrocephaly >97th percentile

Each component has a specific meaning:

  • CDC growth charts — The cdc growth charts recorded for the scenario being assessed.

Note: Interpret the head circumference result against the thresholds and context described above.

How to Use

Enter the CDC growth charts for the scenario you are assessing. Determine head circumference percentile by age and sex using CDC growth charts. Microcephaly <3rd percentile, macrocephaly >97th percentile. Use the head circumference result to inform your calculation.

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Frequently Asked Questions