Baby Percentile Calculator
Calculate your baby's weight, length, and head circumference percentiles based on WHO growth standards. Track your baby's growth relative to other babies of the same age and gender.
Published by:
isCalculator Editorial Team
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How to use this tool?
Baby Percentile Calculator Guide
- Select Gender – Choose Male or Female from the dropdown.
- Enter Age – Input the baby’s age in months (0–60). Use decimals for partial months (e.g., 12.5).
- Provide Measurements (all in metric units):
- Weight in kilograms (kg)
- Length in centimeters (cm)
- Head Circumference in centimeters (cm)
- Click “Calculate Percentiles” – The tool compares your baby’s measurements against WHO growth standards.
- Read Results – Each measurement shows a percentile (e.g., “Weight: 45.2th percentile”). A higher percentile means larger than average; lower means smaller.
Note: All inputs must be metric. Age is required; at least one measurement is needed for results.
Previous Results
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Frequently Asked Questions
A baby percentile indicates how your baby's measurement compares to other babies of the same age and gender. For example, a weight in the 60th percentile means your baby weighs more than 60% of babies the same age.
Percentiles are based on WHO growth standards using LMS parameters. The calculator converts your baby's measurement to a z-score and then to a percentile using a cumulative normal distribution approximation.
Percentiles range from 0 to 100. Values above 100 are not possible. If you get a result near 100, it means your baby's measurement is very high. Always consult your pediatrician for interpretation.
