The average weight of an 11-year-old girl in the United States is about 81.5 pounds (37 kg), based on the 50th percentile of the CDC growth charts. That means half of 11-year-old girls weigh more and half weigh less. But “average” and “healthy” aren’t the same thing, and the healthy range is quite wide at this age.
The Healthy Weight Range at Age 11
Because girls at 11 are at very different stages of puberty and growth, there’s no single number that qualifies as “normal.” The CDC considers a healthy weight to fall between the 5th and 85th percentiles on growth charts designed for age and sex. For an 11-year-old girl, that translates to roughly 53 to 102 pounds. A girl at either end of that range can be perfectly healthy.
Height plays a huge role. An 11-year-old who is 4’6″ will naturally weigh less than one who is already 5’2″, and both can be right on track. This is why pediatricians use BMI-for-age percentiles rather than weight alone. BMI-for-age accounts for height, age, and sex all at once, giving a much more accurate picture than stepping on a scale.
What BMI Percentiles Mean for Kids
The CDC defines four weight categories for children and teens ages 2 through 19:
- Underweight: below the 5th percentile
- Healthy weight: 5th to just under the 85th percentile
- Overweight: 85th to just under the 95th percentile
- Obesity: 95th percentile or above
These percentiles compare a child to other children of the same age and sex. A girl at the 60th percentile, for example, weighs more than 60% of 11-year-old girls and less than 40%. The charts are based on large national surveys of measured heights and weights, so they reflect actual U.S. children rather than idealized numbers.
Why Weight Varies So Much at This Age
Age 11 sits right in the middle of a dramatic transition. Some girls begin puberty as early as 8, while others don’t start until 12 or 13. Puberty triggers growth spurts, increases in body fat (especially around the hips and chest), and changes in muscle mass. A girl who has already started her period may weigh 15 to 20 pounds more than a classmate who hasn’t begun puberty yet, and both can be completely healthy.
Genetics also matters. Taller parents tend to have taller, heavier children. Body frame size, bone density, and muscle composition all vary from one family to the next. Two girls with the same BMI percentile can look very different physically.
Trends in Childhood Weight
Average weights for American children have been climbing for decades. The most recent national data, covering August 2021 through August 2023, found that 20.4% of girls ages 6 to 11 met the criteria for obesity. That’s up slightly from 19.2% in 2017 to 2018. While the increase is modest over that short window, the long-term trend has been consistent: children today are heavier on average than children were 30 or 40 years ago.
This shift means the “average” weight is higher than it once was. It also means that being at the 50th percentile doesn’t automatically signal ideal health. A child’s growth trajectory over time, how consistently she follows her own curve on the chart, matters more than any single weigh-in.
How to Interpret Your Child’s Weight
If you’re looking up average weight because you’re concerned about your daughter, the most useful step is to track her BMI-for-age percentile over multiple visits rather than comparing her to a single number. A child who has always been at the 70th percentile and stays there is following a healthy pattern. A child who jumps from the 50th to the 90th percentile in a year may warrant a closer look at activity levels and eating habits.
The CDC offers a free online BMI calculator for children and teens that plots results on the appropriate growth chart. You’ll need your child’s exact age, height, and weight. The result will place her in one of the four categories and show where she falls relative to other girls her age. Keep in mind that BMI is a screening tool, not a diagnosis. It doesn’t distinguish between muscle and fat, and it can’t account for the timing of puberty. A pediatrician can put the number in context with a physical exam and growth history.