Baby Weight Calculator
Estimate your baby's weight percentile based on age, weight, and gender using WHO growth charts.
Published by:
isCalculator Editorial Team
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How to use this tool?
Follow these steps to use the Baby Weight Calculator:
- Enter Age: Type the baby's age in months (0 to 60). Use decimals if needed (e.g., 6.5).
- Enter Weight: Type the baby's weight in kilograms (0.5 to 30 kg). Use decimals if needed (e.g., 7.5).
- Select Gender: Choose Male or Female from the dropdown.
- Calculate: Click the Calculate Percentile button.
- Read Result: The tool shows your baby's weight percentile (e.g., "75th percentile") and a brief explanation with the median weight and z-score.
Note: This calculator uses metric units (kg and months) and WHO growth chart data. Ensure inputs are within the valid ranges shown.
Previous Results
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Frequently Asked Questions
A baby weight percentile indicates how your baby's weight compares to other babies of the same age and gender. For example, the 50th percentile means your baby weighs more than 50% of babies.
We use WHO growth chart data with median and standard deviation for each month. The z-score is computed as (baby's weight - median) / SD, then converted to percentile using the standard normal distribution.
The calculator rounds to the nearest month. For precise results, consult your pediatrician.
