How To Predict The Adult Height Of Boys And Girls

Whether it’s a newborn or a growing child, parents need to have a clear understanding of a child’s (relative) height development in the future. The primary method still relies on bone age and combining the heights of both parents to estimate a child’s future height. Here are some common methods for predicting a child’s height that you can apply to anticipate your child’s future height while also considering ways to support their growth.

How to Predict the Adult Height of Boys and Girls
How to Predict the Adult Height of Boys and Girls

Methods for Predicting a Child’s Height

There are various methods available to predict a child’s height. Typically, a child’s actual height may differ from certain specific height predictions. Here are some methods for estimating a child’s height that parents can refer to:

Bone Age Method

In this method, bone age is used to predict a child’s future height. Bone age is a measurement that can be used to assess growth, development, diagnose various conditions, and disorders. The Greulich-Pyle method uses X-ray images of the left wrist and hand to determine bone age, then compares these X-ray images to a complete dataset of different bone ages. Based on bone age, doctors can determine how long a child’s growth will continue, at what age they will reach puberty, and what their future height may be. This research is also used to measure any potential growth deficiencies that may occur due to various factors, such as endocrine, orthopedic, and genetic factors in nature. The bone age method has a relatively high level of accuracy as it requires X-ray imaging to predict a child’s future height.

Khamis-Roche Method

The Khamis-Roche method is one of the most accurate ways to predict an adult’s height without needing to determine bone age. This method typically takes into account the child’s age, gender, weight, the child’s height, and the heights of both parents. It is most suitable for children aged 4 to 9.

Using Growth Charts to Predict a Child’s Height

Most countries have established growth charts for estimating height over different decades. These charts serve as valuable sources of information for this method. The percentile curves represent various aspects of different body parts in a child. There may be multiple charts comparing the growth rates of various body parts. Various measurements such as the child’s height, weight, and even head circumference can be taken into consideration. These values can then be input into growth charts and compared to the average values for expected measurements in children of the same gender and age. Since the growth curves for most children generally remain consistent, these charts are considered a reasonably good way to predict a child’s future height.

Other Methods for Predicting a Child’s Height

There are simpler and less accurate methods for predicting a child’s adult height in the future. These include:

Average Height Method

A child’s genetics play a significant role in determining their future height. While there will still be some margin of error, this method can be up to 95% accurate in predicting actual height.

The method involves:

– Taking the height of both the child’s father and mother.

– Adding them together and finding the average (dividing by 2).

– Subtracting 7.6 cm or 2.5 inches from the average if the child is a girl, or adding the same amount to the average if the child is a boy.

Multiplicative Factor Method

One of the average height estimation methods for children is the multiplicative factor method. This is a straightforward way to determine your child’s future height. While there is no formal research to support this, it has been proven to be reasonably accurate. The calculation goes as follows:

– Measure the height of a boy when he is 2 years old and a girl when she is 1.5 years old.

– Multiply these heights by a factor of two.

Formula to Estimate a Child’s Maximum Height Based on Parents

To estimate a child’s maximum height when they reach adulthood, it’s entirely possible to rely on the heights of both parents. The method for calculating a child’s height based on their parents is highly regarded by experts due to the significant influence of genetics on a child’s height.

– Calculating a Son’s Height: Child’s Height = [(Father’s Height + Mother’s Height) + 13 cm] / 2

– Calculating a Daughter’s Height: Child’s Height = [(Father’s Height + Mother’s Height) – 13 cm] / 2

Factors Contributing to a Child’s Height

It is said that genetics determine approximately 60-80% of a child’s height. However, the remaining percentage depends on various other factors such as gender, nutrition, the surrounding environment, a balanced diet, physical activity, emotional stress, and the child’s weight. These factors play a significant role in a child’s height compared to other influences.


Genetics is the most significant factor in determining a child’s height, controlling nearly 60-80% of a child’s height. Genetics is crucial for a child in determining their height. However, these genes can be influenced to some extent by optimizing the child’s surrounding environment and nutrition.


Ensuring that your child has a healthy and balanced diet is essential for maintaining healthy growth of cells and tissues, both of which are necessary for consistent height development. Malnutrition or an imbalanced diet can lead to stunted growth in children, which is why it is vital to adjust a child’s diet to promote better growth.


Boys tend to be slightly taller than girls under similar circumstances. Their growth curves differ because girls mature much faster during adolescence, while boys typically continue growing into late adolescence. These physical differences contribute to variations in height between boys and girls.

Physical Activity

The amount of physical activity a boy or girl engages in also contributes to their development. Children who engage in more physical activity tend to have better growth rates compared to those who are less physically active under the same initial circumstances. Physical activity keeps your child healthy and well-balanced, aiding in their consistent growth.

Factors Influencing the Calculation of a Child’s Height

According to medical experts, genetics and gender account for 70% of a child’s future height (inherited from the parents), while the remaining 30% is influenced by external factors, including:

– Nutrition: Overweight children may experience early height development compared to their peers, but they are at risk of slowing down in height as they grow older. Malnourished or underweight children tend to be shorter than average due to insufficient or imbalanced diets.

– Endocrine Factors: Endocrine issues can significantly impact a child’s height calculation. Endocrine disorders can disrupt growth in children. Children with endocrine disorders, such as thyroid issues, may not produce enough hormones required for bone development, leading to delayed height growth.

– Medication Effects: Certain medications containing corticosteroids used to treat inflammation, allergies, and other conditions can reduce calcium absorption in the intestines, preventing bone tissues from receiving adequate nutrition for growth. Hence, it’s essential for parents to consider whether medication could be a factor in limiting their child’s height.

– Health Conditions: Children with chronic illnesses like joint inflammation or gastrointestinal conditions may struggle to achieve standard height growth.

– Genetic Mutations: Children with genetic disorders like Down syndrome tend to be shorter than typical children. Conversely, Marfan syndrome can lead to excessive height growth in children.

– Other Factors: Aside from the above-mentioned factors, diet, living environment, lifestyle habits, physical activity, and sports can all influence a child’s growth process and height calculation.

How to Help Your Child Grow Taller

While a child’s height is primarily determined by genetics, there are various ways to help a child reach their maximum height.

Here are some height-boosting strategies that parents can consider:

– Maintain a Proper Diet: Include age-appropriate, nutritious foods in your child’s diet to support their growth. Ensure they have a balanced diet with an emphasis on calcium-rich foods to ensure proper bone development and provide adequate hydration.

– Adequate Sleep: The organs responsible for energy and growth replenish themselves primarily during sleep. Therefore, it’s important to ensure your child gets enough sleep. Toddlers need 10-13 hours of sleep per night, school-age children need 10-12 hours, and teenagers should aim for 8-9 hours of sleep. Establish a regular sleep schedule to create the best conditions for growth.

– Regular Physical Activity: Exercise not only helps prevent obesity but also supports growth. Children should engage in at least 60 minutes of physical activity each day.

– Consult with Experts: If you notice signs of growth delay in your child, consult with medical professionals, as it could be related to their health. Medical examinations can help detect any abnormalities in your child’s body and lead to effective treatment plans.

These are valuable insights on how to calculate a child’s height and ways to enhance their growth. With the right approach, a healthy lifestyle, proper nutrition, regular exercise, and height-boosting products, parents can make a significant difference in their child’s height.


How can you predict adult height?

Predicting adult height can be done through various methods. One common method is using the child’s current age, gender, bone age, and the heights of their parents. Genetic factors play a significant role in determining adult height.

What is the most accurate way of predicting height?

One of the most accurate ways to predict height is through methods that consider the child’s bone age, gender, weight, and the heights of both parents. The Khamis-Roche method is one such approach that doesn’t rely on bone age and is highly regarded for its accuracy.

What determines how tall a boy will be?

A boy’s adult height is determined by a combination of genetic factors, nutrition, hormonal balance, and overall health. Genetics, in particular, plays a significant role, accounting for a large portion of a boy’s ultimate height.

How do you predict height from a growth chart?

Growth charts are used to monitor a child’s growth over time. To predict a child’s future height from a growth chart, you’ll need to track their current height and age, then compare it to the expected height and age data on the chart. This can provide an estimate of the child’s future height based on their growth pattern.


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