Growth Chart Calculator
WHO and CDC references
At age 3, the CDC median weight is about 14.3 kg for boys and 13.9 kg for girls. Use the calculator below to see where a child sits by weight percentile, then read that result together with height and BMI for a fuller growth picture.
This embedded tool follows the same setup as the toddler growth chart. Weight percentile is highlighted first, while height and BMI stay visible so one number is not read in isolation.
Percentile results
Current percentile summary
Interactive charts
Visualize the current percentile position
On CDC charts, boys at age 3 usually span a broad range of normal weights. A child near the lower or upper end may still be growing normally if the pattern stays aligned with height, BMI, appetite, and family build. The median CDC reference point is 14.3 kg (31.5 lbs), but a healthy child can still sit above or below that midpoint if the broader pattern remains steady.
Girls at age 3 also show a wide normal range on CDC charts. One measurement can be useful for orientation, but repeated growth points tell you much more than a single scale reading taken by itself. The median CDC reference point is 13.9 kg (30.6 lbs), and the trend over repeated visits still matters more than matching the exact median.
Use the unit switch to compare kilograms with pounds across the same percentile rows. The table is meant for quick reference, while the calculator above uses the exact age setup needed for a more precise read.
Boys and girls reference rows with percentile cut points.
| Percentile | Boys (kg) | Girls (kg) |
|---|---|---|
| P3 | 11.8 | 11.3 |
| P10 | 12.6 | 12.1 |
| P25 | 13.5 | 13.0 |
| P50 | 14.3 | 13.9 |
| P75 | 15.3 | 14.9 |
| P90 | 16.3 | 15.9 |
| P97 | 17.9 | 17.9 |
At age 3, weight is shaped by genetics, appetite pattern, activity level, illness, sleep, and overall calorie intake across the week rather than any one meal. Some children look leaner because height rises faster before weight catches up. Others gain more evenly. That is why a 3 year old weight chart should be read with height and BMI together instead of treating weight alone as the whole answer.
It is reasonable to ask for pediatric review when weight crosses two major percentile channels, no longer fits height trend, or changes with fatigue, feeding issues, vomiting, chronic diarrhea, or repeated illness. This page is an educational tool, not a diagnosis. If you are wondering whether a 3 year old is overweight or underweight, BMI-for-age and the longer growth pattern matter more than one isolated percentile.
Medical disclaimer
Growth chart results are educational and depend on age, sex, measurement quality, and CDC reference logic. Ask a pediatric clinician about persistent percentile shifts, feeding concerns, puberty-related changes, or any question about weight that does not fit the overall clinical picture.
These answers cover the most common parent questions about average 3 year old weight, boys versus girls comparisons, overweight concerns, and pounds conversions.
At age 3, the CDC median weight for boys is about 14.3 kg, or about 31.5 lb. That is the 50th percentile, not a target every child needs to match. A healthy boy can still be below or above that number if height, BMI, appetite, and growth trend remain coherent over time.
Editorial Review
Content is maintained by our editorial team and reviewed against primary WHO and CDC growth references. Last reviewed site-wide on March 18, 2026.