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Head Circumference Percentile

Assess pediatric head growth using WHO/CDC standards. Detect microcephaly (Z < -2) or macrocephaly (Z > +2) with clinical interpretation.

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Z < -2: microcephaly Z > +2: macrocephaly WHO for 0-24 months

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Why: Head circumference monitoring detects growth abnormalities. Early identification supports timely intervention.

How: Uses LMS method: Z = ((HC/M)^L - 1)/(L×S). Compares to WHO/CDC growth standards by age and sex.

Z < -2: microcephalyZ > +2: macrocephaly
Sources:WHO Growth Standards

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Calculate Head Circumference PercentileUse the calculator below to check your health metrics

👶 Term Newborn

Healthy newborn at birth

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👧 3-Month Girl

Routine well-baby visit

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👦 12-Month Boy

First birthday checkup

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📈 Large Head

Above 97th percentile

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📉 Small Head

Below 3rd percentile

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For informational purposes only — not medical advice. Consult a healthcare professional before acting on results.

🏥 Health Facts

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Routine HC at well-child visits 0-36 months

— AAP

Understanding Head Circumference

Head circumference reflects brain growth. The brain grows rapidly in the first year of life, doubling in size by 6 months. Monitoring head growth helps identify conditions that may affect brain development.

Microcephaly

<3rd percentile

  • • May indicate brain growth issue
  • • Requires evaluation
  • • Often genetic or infectious

Normal Range

3rd-97th percentile

  • • Wide normal variation
  • • Family patterns matter
  • • Track trajectory

Macrocephaly

>97th percentile

  • • Often familial/benign
  • • Rule out hydrocephalus
  • • Check family head sizes
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