Head Circumference Percentile Calculator (Birth to 36 Months)

Your details

CDC growth charts are sex-specific because boys and girls follow different head growth trajectories.
Age in completed months (0 to 36). Use corrected age for premature infants.
months
Measure around the largest part of the head: just above the eyebrows and ears, around the most prominent point at the back. Take three measurements and use the largest.
cm
PercentileTypical Range
58.3%

Percentage of children of the same age and sex with a smaller head circumference

Z-score0.21
Median for age43.7
3rd percentile cutoff41.2
97th percentile cutoff46.2
Growth rangeBetween the 50th and 85th percentile (above average)
58.3 %63.0% below · Percentile

Your child is at the 58th percentile for head circumference.

  • 42% of boys at 6 months have a larger head circumference; 58% have a smaller one.
  • The median for a 6-month-old boy is 43.7 cm. Your child's measurement is 0.3 cm above that median.
  • This measurement falls within the typical range (3rd to 97th percentile) used in clinical practice.
  • A single measurement is less informative than the growth trend over time. Consistent tracking at well-child visits is the most reliable way to assess development.

Next stepContinue routine well-child visits to monitor the growth trend over time.

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