Head Circumference Percentile Calculator
Calculate head circumference percentiles for children using WHO growth standards
Calculate Head Circumference Percentile
Growth patterns differ slightly between boys and girls
Valid range: 0-60 months (5 years)
Measure around the widest part of the head, above eyebrows and ears
Head Circumference Assessment Results
Enter your child's information to calculate head circumference percentile
Valid age range: 0-60 months (birth to 5 years)
How to Measure Head Circumference
Measurement Steps
- Use a non-stretchable measuring tape (or string)
- Position tape above the eyebrows (one finger width above)
- Wrap around the widest part of the head, above the ears
- Include the most prominent part of the back of the head
- Ensure tape is snug but not tight
- Take the largest of three measurements
Tips for Accurate Measurement
- • Measure when baby is calm and still
- • Avoid measuring over hair accessories or when hair is wet
- • Use the same measuring technique each time
- • Record measurements to track growth over time
Percentile Interpretation
Average Head Sizes
These are approximate averages (50th percentile)
Medical Disclaimer: This calculator provides estimates for educational purposes only. Head circumference measurements should always be interpreted by qualified healthcare professionals in the context of overall growth and development.
Understanding Head Circumference Percentiles
Why Monitor Head Circumference?
Head circumference reflects brain growth and development. It's one of the most important measurements in pediatric healthcare, helping doctors assess neurological development and detect potential issues early.
Clinical Significance
- •Microcephaly (<3rd percentile): May indicate genetic disorders, infections, or brain malformations
- •Normal Range (10th-90th percentile): Indicates typical brain growth
- •Macrocephaly (>97th percentile): May indicate hydrocephalus or other conditions
Growth Monitoring
Normal Growth Pattern
Child follows same percentile channel over time
Concerning Pattern
Crossing two or more percentile lines rapidly
Measurement Frequency
Regular pediatric visits track growth over time
WHO Growth Standards
This calculator uses World Health Organization (WHO) growth standards, developed from data collected in the WHO Multicentre Growth Reference Study. These standards represent optimal growth for children up to 5 years of age and are used globally by healthcare professionals.