Use this free percentile calculator for babies to track weight and height by age. See how your child compares on WHO growth charts for boys and girls.
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This baby growth chart calculator lets you track your child’s weight and height percentiles against the official WHO Child Growth Standards.
Parents often search for terms like “baby weight percentile calculator” or “child growth chart calculator” — this tool brings those calculations together in one place.
Percentiles show how your baby’s measurements compare to children of the same age and sex:
Example: A 12-month-old boy weighing 10.2 kg may be in the 40th percentile — meaning about 40% of boys his age weigh less and 60% weigh more. This is normal and simply shows his position on the growth chart.
Percentiles are not exams your baby must “pass.” Healthy children can fall anywhere on the chart.
What matters is the trend over time — is your baby steadily tracking along a curve, whether it’s the 25th, 50th, or 75th percentile?
Sudden changes can happen due to nutrition, illness, or growth spurts, but most even out over time.
This baby percentile calculator is meant for easy tracking — you enter your child’s age, weight, and height, and it shows the corresponding percentile.
It can be used for newborn weight percentiles, toddler height percentiles, or general child growth percentiles. By checking every few months, you’ll see whether your baby’s growth stays consistent or shifts to a new curve.