How to use
- Choose the reference and the child's sex.
- Enter the age in years and months, the height and the weight. Measure length lying down under 2 years.
- Read the height and weight percentiles and see the height plotted on the growth chart. Click "Save this measurement" to keep it; saved measurements are drawn as a curve.
Options explained
- Percentile
- The 50th percentile is the median for that age and sex; the 90th means taller (or heavier) than 90% of children. Anything from the 3rd to the 97th is in the usual range.
- WHO growth charts
- The WHO Child Growth Standards (2006) cover birth to 5 years and the WHO Growth Reference (2007) covers 5 to 19; weight-for-age stops at 10 years.
- CDC growth charts
- The CDC 2000 charts cover birth to 20 years. Under 2 they describe length measured lying down, from 2 years standing height.
- China standard
- China's National Health Commission standards WS/T 423—2022 (under 7) and WS/T 612—2018 (height from 7 to 18).
Examples (CDC)
| Child | Height | Percentile | Median for age |
|---|---|---|---|
| Boy, 2 years | 86.5 cm | 50th | 86.5 cm |
| Boy, 5 years | 110.0 cm | 59th | 108.9 cm |
| Girl, 8 years | 125.0 cm | 33rd | 127.6 cm |
Source: CDC 2000 growth charts (public domain).
Frequently asked questions
My child is at the 15th percentile. Is that a problem?
Not on its own — the 3rd to 97th percentiles are the usual range. What matters more is the trend. A child who drops across two major percentile lines, or stays below the 3rd, is worth checking with a paediatrician.
Should I use the WHO or the CDC charts?
Use the charts your doctor uses. Most countries use WHO; in the United States the CDC recommends WHO charts under 2 and the CDC charts from 2 years. The two give similar but not identical percentiles — WHO describes how breastfed children grow in good conditions, CDC describes American children in the 1960s–90s.
Where are saved measurements kept?
Only in your browser's local storage on this device. Nothing is uploaded, and clearing the browser data removes them.
How should I measure height?
Lying down for babies under 2, standing without shoes for older children, heels together against a wall, ideally in the morning. Measure the same way each time so the results are comparable.
Is the data sent anywhere?
No. The calculation runs entirely in your browser.
Privacy
This tool runs entirely in your browser. Your files and text are processed on your device and are never uploaded to our servers.