Growth Chart Calculator
WHO and CDC references
At age 4, the CDC median weight is about 16.2 kg for boys and 15.8 kg for girls. Use the calculator below to check where a child falls by weight percentile, then compare that result with height and BMI to see the broader growth pattern.
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
A 4 year old boy can still be perfectly healthy across a wide span of weights, as long as height, BMI, appetite, and development fit together. The median is just the midpoint of the reference group, not a universal goal. The median CDC reference point is 16.2 kg (35.7 lbs), but a healthy child can still sit above or below that midpoint if the broader pattern remains steady.
A 4 year old girl may sit below or above the median and still follow a normal pattern. The question is usually whether the curve stays stable and whether weight still makes sense alongside height and BMI-for-age over time. The median CDC reference point is 15.8 kg (34.8 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 | 13.2 | 12.7 |
| P10 | 14.2 | 13.7 |
| P25 | 15.2 | 14.7 |
| P50 | 16.2 | 15.8 |
| P75 | 17.4 | 17.1 |
| P90 | 18.7 | 18.5 |
| P97 | 20.9 | 21.1 |
At age 4, growth becomes a mix of genetics, body build, activity, sleep, food pattern, and how quickly height is changing at the same time. Preschool children often have uneven appetite from week to week, which can make parents worry even when the curve stays fine. That is why a 4 year old weight chart works best when you read it as a trend instead of a one-day verdict.
A pediatric visit is worth discussing when weight repeatedly crosses two percentile channels, BMI stays high or low for the child’s height, or eating, stooling, energy, and illness history stop fitting the usual pattern. This page is for screening and orientation only. If you are asking whether a 4 year old is overweight, BMI-for-age and the longer curve are still the more useful clinical clues.
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 focus on average 4 year old weight, boys versus girls reference points, pounds conversions, and when a heavier pattern deserves more context.
At age 4, the CDC median weight for boys is about 16.2 kg, or about 35.7 lb. Many healthy boys will still track below or above that midpoint. The better question is whether weight percentile fits height, BMI-for-age, appetite, and the longer trend seen over repeated visits.
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.