Pediatric and Neonatal - Infant Head Circumference for Age Percentiles (< 36 months)

CDC/NCHS Infant Head Circumference for Age Percentiles (< 36 months)

Input:
Sex Female

Male
Age
Head Circumference
Results:
Z Score  
Percentile  
 
Decimal Precision:
Head Circumference for Age Percentile Interpretation
Percentile < 3:Microcephaly
Percentile >= 3 and < 97:Normal head circumference
Percentile >= 97:Macrocephaly
  • Microcephaly is a Head Circumference greater than two standard deviations below the mean.
  • Macrocephaly is a Head Circumference greater than two standard deviations above the mean.
  • At the extremes (>97th percentile or <3rd percentile), small differences in percentiles represent clinically important differences in head circumference. At these extremes, the z-score is a more precise reflection of how far the measurement deviates from the mean, and is a useful tool for tracking changes.
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