Medically reviewed by Daniel Bubnis, M.S., NASM-CPT, NASE Level II-CSS, specialty in fitness — Written by Jenna Fletcher on September 24, 2020

To tell whether a young adolescent has actually a healthy and balanced weight, it can assist to recognize the average for their age and also sex. The averages for 12-year-olds are 89 pounds, for males, and 92 pounds, for females.

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However, beyond biological sex, many various other factors influence someone’s weight at this age, consisting of their height, body composition, the oncollection of puberty, ecological components, and underlying health worries.

Below, we check out the avereras and also the components that affect them, using statistics from the Centers for Disease Control and Prevention (CDC). We additionally describe some wellness risks of having a weight that is substantially below or over average.

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Biological sex plays a duty in weight, and in general, a 12-year-old female weighs slightly even more than a male of the exact same age.

When pointing out a child’s weight, a physician might refer to a statistic that indicates the percent of others that weigh much less or even more.

For example, a boy in the 35th percentile weighs even more than 35% of children of the very same age and also sex. By the same token, they weight much less than 65% of these peers.

Below, learn even more around the averperiods for 12-year-old males and females.


According to the CDC, the average weight of a 12-year-old female is 92 pounds (lb), or roughly 42 kilograms (kg).

Below, discover the average range by percentile:

Percentilelbkg (rounded to nearest value)


The CDC report that the average weight of a 12-year-old male is 89 lb, or about 40 kg.

Below, discover the average array by percentile:

Percentilelbkg (rounded to nearest value)

Complications of low or high weight

A doctor might be came to about the weight and also health of a young adolescent if:

their weight drops past the upper or lower percentiles on the CDC’s growth chartthere has actually been a drastic change in their weight

When their weight falls significantly above or listed below the average, a young adolescent may have a threat of health complications. We outline some examples listed below.

Complications of low weight

Doctors might usage the expression “failure to thrive” as soon as describing a kid through bad weight acquire or sudden weight loss. The expression usually uses to babies and toddlers, though older children can likewise have challenge gaining or preserving weight.

The complying with are some potential causes of slow weight obtain in children:

Premature birth: This can bring about the underdevelopment of specific muscles. Metabolic disorders: These deserve to interfere through the body’s capacity to convert food right into power.Financial difficulties: These deserve to make it tough for parental fees and also caregivers to provide enough food.

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A kid via very low weight may have:

developmental delaysproblems via thinkingbehavioral issuestroubles at schoolbelow-average height

Complications of high weight

Children and young teens through overweight or weight problems might have actually an increased hazard of:

anxietylow self-esteem

As the CDC note, kids through weight problems are also more likely to develop severe weight problems and associated hazard components as adults.