Baby Weight Percentile Calculator
Find your baby weight-for-age percentile using the World Health Organization child growth standards for children from birth to 24 months. Percentiles compare your infant weight against a healthy reference population, so a value of 50 means about half of babies the same age and sex weigh less and half weigh more. There is a very wide healthy range, and the trend across visits usually matters far more than any single reading, since babies who track steadily along their own curve tend to be growing well. This tool uses the WHO LMS parameters to estimate a z score and convert it to a percentile. Enter the age in months, the sex, and the weight in kilograms or pounds to see where your baby sits. Everything is computed in your browser, and this is general information, not medical advice. Always discuss growth with your pediatrician.
How to use Baby Weight Percentile Calculator
- Select your baby sex and enter age in months.
- Enter the current weight in pounds or kilograms.
- Read the weight-for-age percentile against WHO standards.
Frequently asked questions
Which growth standard does this use?
It uses the WHO weight-for-age growth standards for infants from birth to 24 months, comparing your baby against a healthy international reference population.
What does a percentile actually mean here?
A weight in the 40th percentile means about 40 percent of babies the same age and sex weigh less; a steady curve matters more than any single number.
Do I enter weight in pounds or kilograms?
You can enter weight in either pounds or kilograms and the tool converts internally, then reports the weight-for-age percentile for your child age and sex.
What is Baby Weight Percentile Calculator?
Find your baby weight-for-age percentile using the World Health Organization child growth standards for children from birth to 24 months. Percentiles compare your infant weight against a healthy reference population, so a value of 50 means about half of babies the same age and sex weigh less and half weigh more.
Is Baby Weight Percentile Calculator free to use?
Yes. Baby Weight Percentile Calculator is completely free, with no sign-up and no usage limits.
Does Baby Weight Percentile Calculator work in a web browser?
Yes. Baby Weight Percentile Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Baby Weight Percentile Calculator?
Yes. Baby Weight Percentile Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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