Pink Mom MathBaby Head Circumference Percentile Calculator
Enter your baby's age, sex, and head circumference to see the percentile on WHO/CDC growth charts (ages 0-36 months).
How Head Circumference Percentiles Work
Head circumference is measured at the largest point around the head (above the eyebrows and ears, around the back of the skull). This measurement reflects brain size and growth rate.
This calculator uses:
- WHO standards (0–23 months): Based on children in optimal growth conditions, with monthly data points
- CDC charts (24–36 months): Based on US population data, covering the 24–36 month range
Data is only available for ages 0–36 months. After 36 months, head circumference is not routinely plotted on growth charts because brain growth has largely plateaued.
Frequently Asked Questions
Related Calculators
Baby Growth Percentile Calculator
Plot your baby's weight, height, and BMI on WHO/CDC growth curves with percentile ranking.
Baby Weight Gain Calculator
Track your baby's weight gain trajectory against expected curves by age.
Baby Development Milestone Calculator
See expected milestones by age for motor, cognitive, social, and language development.
Baby Height Predictor
Predict your child's adult height using the Tanner midparental height method.
Related Guides
Reading Your Baby's Growth Chart: WHO vs CDC Standards
How to read a pediatric growth chart, when WHO vs CDC standards apply, what percentile ranges are healthy, and how to interpret your baby weight and length measurements.
Baby Growth Percentiles Explained
What baby growth percentiles mean, why ranking matters less than consistent tracking, when a drop in percentile needs evaluation, and how to use percentile data.
Developmental Milestones: What to Expect Month by Month
CDC 2022 milestone guidelines for motor, cognitive, language, and social development from birth to 24 months. Includes red flags and when to discuss concerns with your pediatrician.
This calculator provides estimates for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider with questions about your health or your baby's health.
WHO Child Growth Standards (2006) / CDC Growth Charts (2000, revised). Head circumference percentiles are clinical screening reference tools — consult your pediatrician for interpretation.