Medically the review by Daniel Bubnis, M.S., NASM-CPT, NASE Level II-CSS, Fitness — composed by Jenna Fletcher on September 24, 2020

To tell whether a young adolescent has a healthy weight, it can aid to understand the typical for your age and sex. The averages because that 12-year-olds are 89 pounds, because that males, and 92 pounds, because that females.

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However, beyond biological sex, numerous other determinants influence someone’s weight at this age, including their height, human body composition, the start of puberty, ecological factors, and underlying health and wellness issues.

Below, we check out the averages and the determinants that influence them, utilizing statistics native the Centers for an illness Control and Prevention (CDC). We additionally describe some health dangers of having a weight that is significantly listed below or above average.

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Biological sex dram a role in weight, and in general, a 12-year-old woman weighs slightly an ext than a masculine of the very same age.

When stating a child’s weight, a doctor might refer come a statistic that indicates the percentage of others who weigh much less or more.

For example, a child in the 35th percentile weighs an ext than 35% of youngsters of the same age and sex. Through the exact same token, they weight much less than 65% of these peers.

Below, learn an ext about the averages because that 12-year-old males and also females.


According to the CDC, the mean weight of a 12-year-old woman is 92 pounds (lb), or around 42 kilograms (kg).

Below, uncover the average range by percentile:

Percentilelbkg (rounded come nearest value)


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

Below, find the average selection by percentile:

Percentilelbkg (rounded come nearest value)

Complications of short or high weight

A doctor might be concerned about the weight and also health the a young adolescent if:

their weight falls past the top or lower percentiles ~ above the CDC’s expansion chartthere has actually been a drastic change in your weight

When their weight drops significantly above or listed below the average, a young adolescent may have a risk of health and wellness complications. We rundown some instances below.

Complications of short weight

Doctors may use the expression “failure come thrive” once describing a child with bad weight obtain or sudden weight loss. The expression usually applies to babies and toddlers, though older youngsters can additionally have challenge gaining or preserving weight.

The adhering to are some potential reasons of sluggish weight obtain in children:

Premature birth: This can lead to the underdevelopment of specific muscles. Metabolic disorders: These can interfere v the body’s capacity to transform food into energy.Financial difficulties: These deserve to make it difficult for parents and caregivers to carry out sufficient food.

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A kid with an extremely low weight might have:

developmental delaysproblems through thinkingbehavioral issuesproblems in ~ schoolbelow-average height

Complications of high weight

Children and also young teenagers with overweight or obesity may have an enhanced risk of:

anxietylow self-esteem

As the CDC note, youngsters with weight problems are also more likely to build severe obesity and also associated risk components as adults.