How to use
- Enter Baby's sex, Age, Current head circumference in Baby Head Circumference Calculator. Use the freshest measurement you have, ideally from the same day or clinic visit.
Baby Head Circumference Calculator
Track your baby's head growth percentile using reliable WHO/CDC charts. Monitor brain development.
Result
Your Baby · Baby Head Circumference Calculator
22.3 Percentile
Below average
Age (months): 6.0
Head circumference: 42.0 cm
Z-score: -0.76
Reference: WHO Child Growth Standards (WHO Child Growth Standards (2006)) · Supported ages: 0–60 months
Recommendation
Continue regular monitoring as part of routine care
Parent guide
How to use this tool
Track your baby's head growth percentile using reliable WHO/CDC charts. Monitor brain development.
What the result means
Track your baby's head growth percentile using reliable WHO/CDC charts. Monitor brain development.
Method
LMS z-score using sex- and age-specific head-circumference reference values
Worked example
Important limitation
Tape position and repeated technique matter; unusual trends require clinical measurement and assessment.
References and data notes
Safety note
Use this result for planning and discussion. Contact a qualified healthcare professional for unusual growth changes, feeding difficulty, fever, missed vaccines, developmental concerns, or urgent symptoms.
Next tools to compare
Baby Weight Percentile CalculatorCalculate your baby's weight percentile using WHO or CDC growth charts. See if your baby is growing on track.Baby Height Percentile CalculatorDetermine your baby's height percentile based on WHO or CDC growth charts. Track your baby's growth.Baby Developmental Milestone CheckerCheck which developmental milestones your baby should reach at this age.
Frequently asked questions
Which sources and method does this tool use?
The method, version and primary sources are listed in the evidence section above.
Why might Baby Head Circumference Calculator differ from a clinic visit?
Home measurements, rounding, age calculation, units, and reference choices can all shift the result. Use the same measurement method over time and bring concerns to your pediatrician.
What should I compare with this result?
Compare it with Baby Weight Percentile Calculator, Baby Height Percentile Calculator, Baby Developmental Milestone Checker, recent trends, feeding or sleep notes, and your child's usual behavior. A steady pattern is usually more informative than one isolated value.