Baby Head Circumference Calculator
Check your baby's head circumference against WHO growth standards to monitor healthy brain development.
How It Works
Measure your baby's head at the widest part (above eyebrows and ears). Enter the measurement, age, and sex to see the percentile and whether head growth is on track for healthy brain development.
Formula
Head Circumference Percentile = WHO HC-for-age LMS table lookup
Frequently Asked Questions
How do I measure baby head circumference?
Wrap a flexible measuring tape around the widest part of the head: above the eyebrows and ears, and around the back where the head is largest. Take the measurement 2-3 times and use the largest value.
What is a normal head circumference for babies?
Average head circumference at birth is 34-35 cm. It grows rapidly in the first year, reaching about 46 cm by 12 months. Any consistent percentile from 3rd to 97th is considered normal.