Average Height for Boys: 9-18 Year Old Boy

Height Comparison Team

As boys grow and develop, one of the most noticeable changes is their increase in height. Parents, caregivers, and boys often wonder if their growth is on track and how they compare to their peers.

Understanding the average height for boys at different ages can provide a general benchmark for assessing growth and development. This article will explore the average height for boys aged 9 to 18. We’ll discuss the factors influencing height, the expected growth patterns during puberty, and when boys typically reach adulthood.

By the end of this Height Comparison article, you’ll better understand what to expect in terms of height for boys in this age range and the factors that contribute to their growth.

It’s important to remember that every boy is outstanding and will grow at his own pace. While average heights can be a helpful reference point, they should not be seen as a strict rule or cause for concern if a boy falls above or below the average range.

With this in mind, let’s dive into the data on average heights for boys aged 9 to 18.

How Does Puberty Affect Growth?

average height for boys

Puberty is a crucial development period during which significant changes occur in the body, including growth. Here’s how puberty affects growth:

1. Hormonal Changes: During puberty, the body experiences an increase in hormones, including growth hormone (GH) and sex hormones like testosterone in males and estrogen in females. These hormones play a key role in triggering growth spurts.

2. Growth Plates Activation: Growth plates, also known as epiphyseal vessels, are areas of cartilage located at the ends of long bones in children and adolescents. Hormonal changes during puberty stimulate the growth plates, leading to bone growth and elongation.

3. Height Spurts: One of the most noticeable effects of puberty on growth is the occurrence of growth spurts. These spurts result in rapid increases in height over a relatively short period, typically during early to mid-puberty.

3. Peak Growth: Girls usually experience peak height growth around ages 11-12, while boys experience it a bit later, around ages 13-14. This growth phase may last about two to three years for most individuals.

4. Gender Differences: Boys generally experience more significant growth during puberty than girls due to higher levels of testosterone, which results in broader shoulders, increased muscle mass, and taller stature.

5. Closure of Growth Plates: Towards the end of puberty, growth plates gradually close, signaling the end of vertical growth. Once the growth plates close completely, individuals reach their adult height, and further height increase is not possible through natural growth processes.

6. Nutrition and Health: Adequate nutrition, a balanced diet, and overall good health are crucial factors that support optimal growth during puberty. Nutrient-rich foods and regular physical activity contribute to healthy bone development and growth.

It’s important to note that individual growth patterns can vary widely during puberty due to genetic factors, environmental influences, and overall health.

Monitoring growth patterns and consulting healthcare professionals can help ensure healthy growth and maturing during this critical stage.

Which Factors Can Affect a Kid’s Height and Weight

Several factors can influence a child’s height and weight, including:


  • A child’s genetic makeup, inherited from their parents, determines their height and weight potential.
  • Genetics can account for up to 80% of the variation in height and weight among individuals.


  • A balanced diet of vital nutrients, vitamins, and minerals is crucial for optimal maturing and development.
  • Malnutrition or a diet lacking essential nutrients can negatively impact a child’s height and weight.

Physical Activity

  • Regular exercise and physical activity help keep a healthy weight and promote growth and development.
  • Lack of physical activity or an inactive lifestyle can contribute to unhealthy weight gain.

Medical Conditions

  • Certain medical diseases, such as growth hormone deficiencies, thyroid disorders, or chronic illnesses, can affect a child’s growth and weight.
  • Medications used to treat some health conditions may also impact height and weight.

Environmental Factors

  • Environmental factors, such as access to healthcare, socioeconomic status, and living conditions, can indirectly affect a child’s height and weight.
  • Exposure to pollutants, toxins, or stress can also influence growth and development.


  • Good sleep is essential for growth and development, as growth hormone is mainly released during deep sleep.
  • Chronic lack of sleep or poor sleep quality can hinder a child’s growth and contribute to weight issues.


  • Hormonal changes, particularly during puberty, play a significant role in growth and development.
  • Imbalances in hormones like growth, thyroid, or sex hormones can impact height and weight.

Birth Factors

  • Birth weight, gestational age, and maternal health during pregnancy can influence a child’s initial growth trajectory.
  • Low birth weight or premature birth may affect a child’s height and weight later in life.

Psychosocial Factors

  • Emotional stress, abuse, neglect, or other psychosocial factors can indirectly affect a child’s growth and weight by influencing their eating habits, physical activity, and overall health.

It’s important to note that these factors often interact, and the impact on height and weight can vary from child to child. Regular check-ups with a pediatrician can assist monitor a child’s growth and address any concerns.

What’s the Average Height for Boys?

average height for boys

The average height for boys varies depending on age and can be influenced by genetics, nutrition, and overall health. Here’s a table showing the average height for boys in the United States according to the Centers for Disease Control and Prevention (CDC):

Age (Years) Average Height (Inches) Average Height (Centimeters)
9 52.6 133.6
10 54.5 138.4
11 56.4 143.3
12 58.7 149.1
13 61.4 156.0
14 64.6 164.1
15 67.3 170.9
16 68.9 175.0
17 69.6 176.8
18 69.8 177.3

It’s important to remember that these are average heights, and individual boys may be taller or shorter than these figures. The growth pattern for boys typically involves a growth spurt during puberty, which usually begins between the ages of 10 and 14 and lasts several years.

During puberty, boys often experience rapid growth in height, with the peak growth rate occurring around age 14. After this peak, growth gradually slows down, and most boys reach their adult height by the age of 18 or 19.

It’s crucial to remember that every child grows and develops at their own pace, and slight deviations from the average height are not a cause for concern. However, if you have doubts or concerns about your child’s growth, it’s always best to consult a pediatrician for personalized advice and guidance.


The average height for boys aged 9 to 18 can be a valuable benchmark for tracking growth and development. However, it’s crucial to remember that every boy grows at a unique pace, and individual variations from the average are normal.

Genetics, nutrition, and overall health can influence a boy’s height. If you have concerns about your child’s growth, it’s always best to consult a pediatrician for personalized advice and guidance.

While height is essential to physical development, it is just one part of a child’s overall health and well-being.

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