Baby Growth Percentile Calculator
Compare baby weight and height against WHO median references by age and sex, shown as % above or below the median — a reference comparison, not clinical percentiles. Monitor your childs growth compared to population medians. Health data never leaves your device — every calculation runs locally in your browser.
How to Use the Baby Growth Percentile Calculator
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Frequently Asked Questions
What growth metrics does it calculate?
How far weight and height sit above or below the WHO median for the same age and sex, with linear interpolation between reference ages. These are reference comparisons — not clinical percentiles, which need LMS z-score tables.
What do the +/-% vs median numbers mean?
+0% matches the reference median exactly. The defaults (12-month boy, 75 cm, 10 kg) read about −1.3% height and −2.0% weight against medians of 76 cm and 10.2 kg. Consistent growth near the median line is what matters most.
Which age range is supported?
Birth to 60 months, using reference points at 0, 6, 12, 24, 36, 48, and 60 months with interpolation between them. Ages past 60 months reuse the 60-month reference, so track older children on your pediatrician's chart.
Should I be worried if my baby is below 50th percentile?
Not necessarily. What matters is consistent growth over time, not a single measurement. A baby growing steadily at the 25th percentile is healthy. Consult your pediatrician for concerns.
Is my baby's data stored?
No. All calculations run locally in your browser. No health data is transmitted or stored.
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Last updated October 2026