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Child Weight Percentile Calculator (WHO)
A child weight percentile shows what percentage of children of the same age and sex weigh less than yours, based on WHO weight-for-age reference tables. The 50th percentile is the median; the 3rd–97th range is considered a normal weight when growth is steady. What matters most is the trend along the growth curve, not a single reading.
Check your child's weight percentile on WHO growth charts, ages 0-10. Includes head circumference centile calculator and height for babies. Instant, free.
Medically reviewed by Dr. Ivan IbáñezNº Col. 17/05487Mar 8, 2026
CalcVita. (2026). Child Weight Percentile Calculator (WHO). CalcVita. Retrieved August 31, 2026, from https://calcvita.com/en/calculators/child-weight-percentile
Suggested article
Baby Weight Percentiles: A Parent's Complete Guide to WHO Growth Charts
Understand what your baby's weight percentile really means, how to read WHO growth charts, and when a change in percentile actually warrants a call to the pediatrician.
Read the full article →Key takeaways
- The weight percentile compares your child against WHO weight-for-age tables.
- The 3rd–97th percentile range is considered a normal weight with steady growth.
- The trend over time matters more than a single value.
- Sudden percentile shifts should be reviewed by a pediatrician.
Weight percentile guide
Weight is a sensitive indicator of current nutrition. Sudden shifts in weight percentile are often the first sign of a health or feeding issue.
How it works
WHO growth curves are based on data from 8,440 children across 6 countries (Brazil, Ghana, India, Norway, Oman, and the USA). They represent optimal growth under ideal conditions: breastfeeding, no household smoking, and adequate healthcare.
Interpreting the percentile
| Percentile range | Meaning |
|---|---|
| < P3 | Requires paediatric evaluation to rule out malnutrition or other causes. |
| P3 – P15 | Low weight, but may be normal if the curve is stable and family genetics support it. |
| P15 – P85 | Normal range. Most healthy children fall here. |
| P85 – P97 | High weight, but may be normal in genetically larger children. Monitor the trend. |
| > P97 | Requires paediatric evaluation to rule out overweight or obesity. |
When to worry
A single percentile reading is rarely cause for alarm. The following patterns do warrant medical consultation:
- Sudden drop of 2 or more major percentile lines in a short period.
- Percentile persistently below 3 or above 97 with no family history to explain it.
- Marked discordance between weight percentile and height percentile (e.g. weight at P10 and height at P90).
Practical tips
- Weigh the child at the same time of day, with the same clothing (or undressed), and on the same scale for comparable data.
- The trend matters more than a single number. Record weight periodically and observe the curve over months.
- Do not restrict a child’s diet without professional guidance, even if the percentile seems high.
Sources
- WHO Multicentre Growth Reference Study Group. WHO Child Growth Standards: Length/height-for-age, weight-for-age, weight-for-length, weight-for-height and body mass index-for-age. Geneva: World Health Organization; 2006.
- de Onis M, et al. “Development of a WHO growth reference for school-aged children and adolescents.” Bulletin of the World Health Organization. 2007;85(9):660-667.
Frequently asked questions
- What is a normal weight percentile?
- Generally, the range between the 3rd and 97th percentile is considered normal. The most important thing is not the number, but that the child steadily maintains their own growth channel.
- What does it mean to be in the 75th, 50th, or 25th percentile?
- It means your child weighs more than 75%, 50%, or 25% of children of the same age and sex. The 50th percentile is the exact average.
- What if my child is underweight?
- A percentile below 3 requires pediatric evaluation. However, some children are naturally thin due to genetics (thin parents) and are healthy if their growth curve is stable.
- What is a normal weight percentile for a baby?
- Any percentile between the 3rd and 97th is considered within the normal range. Most healthy babies fall within this span, and the key factor is that the baby follows their own growth curve consistently over time.
- Should I worry if my baby is in a low percentile?
- Not necessarily. Consistency matters more than the absolute number: a baby who stays steadily at the 10th percentile is usually healthy. Concern is warranted if there is a sudden drop of two or more percentile lines in a short period.
- How often should I check my baby's weight percentile?
- It is recommended to follow the well-baby visit schedule: at birth, at 2 weeks, then at 1, 2, 4, 6, 9, and 12 months during the first year. After that, check-ups are typically annual.
- What is the difference between WHO and CDC growth charts?
- WHO charts are based on breastfed children from 6 countries and represent optimal growth from 0 to 5 years. CDC charts describe how American children grow from 2 to 20 years. WHO is the internationally recommended standard for children under 5.
- Can premature babies use the same percentile charts?
- Premature babies require the use of corrected age (chronological age minus weeks of prematurity) at least until age 2. Without correction, their percentiles will appear artificially low and will not reflect their actual growth.
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