How to use
- Choose the reference, the child's sex and the units (cm and kg, or inches and pounds).
- Find the child's age and compare their height and weight with the P3, P50 and P97 columns.
- For an exact percentile, enter the measurements in the growth percentile calculator.
Options explained
- P50 (median)
- Half of children of that age and sex are taller or heavier, half are shorter or lighter.
- P3 and P97
- The lower and upper edges of the usual range. Outside them, talk to a paediatrician.
- Age steps
- Every 3 months to age 2, every 6 months to age 7, then every year. Estimate ages in between from the rows either side.
Median height and weight (CDC)
| Age | Boys’ height | Girls’ height | Boys’ weight | Girls’ weight |
|---|---|---|---|---|
| 1 year | 75.5 cm | 73.8 cm | 10.3 kg | 9.5 kg |
| 3 years | 95.0 cm | 93.9 cm | 14.3 kg | 13.9 kg |
| 6 years | 115.4 cm | 114.7 cm | 20.7 kg | 20.2 kg |
| 10 years | 138.6 cm | 138.0 cm | 31.9 kg | 32.9 kg |
| 15 years | 169.9 cm | 161.9 cm | 56.3 kg | 52.0 kg |
| 18 years | 176.2 cm | 163.1 cm | 67.2 kg | 56.2 kg |
Frequently asked questions
Why does the chart change at age 2?
Under 2, children are measured lying down (length); from 2, standing (height). Standing height is slightly less, so the charts are joined at 2 years.
Which reference should I use?
Most countries use the WHO charts — the WHO Child Growth Standards up to 5 years and the WHO Growth Reference from 5 to 19 (weight only to 10). In the United States the CDC recommends WHO charts under 2 and the CDC charts from 2 to 20. China's standard is based on Chinese children and covers weight only under 7.
My child is between P3 and P50. Should I worry?
No — that is within the usual range. Follow the growth over time; a steady curve matters more than any single number.
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