‘How Tall Will My Child Be’: Can You Predict A Child’s Height?

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As children keep growing, parents cannot resist wondering, “How tall will my child be?” but can you predict your child’s height early on? Also, what are the factors that can influence your child’s height? Read this post, where MomJunction tries to answer such questions.

Can You Predict A Child’s Height?

Experts state that it is difficult to predict how tall a child can grow since several factors determine a child’s height (1). Several physical changes also occur during puberty, and the growth spurts can increase the child’s height by two inches (five centimeters) a year (2). So, it is not possible to determine the child’s height before puberty, but you may try an estimate using various methods.

Methods To Roughly Estimate A Child’s Height

There are a few techniques to get a rough estimate of the child’s adult height. Here are some of them (3) (4).

1. Doubling the height

  • This method is useful if your child has just turned two.
  • Take the child’s height in inches at the age of two years. Multiply the height with two to arrive at the probable adult height.
  • For example, if the child’s height at the age of two years is 35 inches, they will probably attain a height of 70 inches (5 feet 8 inches) as an adult.
  • This method is not backed by scientific research but may still provide some idea about the child’s adult height.

2. Mid-parental height calculation method

  • The mid-parental height calculation method considers the parent’s height to speculate the child’s adult height. According to the American Academy of Family Physicians, this method gives the “child’s projected adult height based on the heights of the parents.
  • If calculating the child’s height in centimeters:

Boys: [Father’s height in cm + (Mother’s height in cm + 13 cm)] / 2
Girls: [(Father’s height in cm – 13 cm) + Mother’s height in cm] / 2

  • If calculating the child’s height in inches:

Boys: [(Mother’s height + Father’s height) / 2] + 2.5 inches
Girls: [(Mother’s height + Father’s height) / 2] – 2.5 inches

  • The mid-parental method can have a margin of error of two inches (5 centimeters), either way.

3. Bone age assessment

  • This method requires an X-ray and an interpretation of the X-ray by a doctor, and thus cannot be done at home.
  • The bone age assessment method uses an X-ray of the hand and wrist to determine how far the bones have developed and assigns a “bone age” which may be different than “chronological age” (the years and months since birth). (5). Based on that, the doctor can estimate the percentage of growth completed and how much more remains to be achieved , which in turn can help predict the likely adult height of the child.
  • Depending on the age of the child, the doctor may take an X-ray of the other areas of the body, such as the elbow, feet, hip or knees, to estimate the height  (6).
  • Doctors usually go for the bone age assessment method for children who seem to have a considerably shorter or taller stature for their age.

The above methods only provide an estimate and not the definite adult height. The American Academy of Pediatrics states that when it comes to the child’s adult height, “no one has a crystal ball.” So, there is no way to know for sure how tall your son or daughter will be as an adult.

What Factors Influence The Child’s Height?

Several environmental conditions and natural attributes affect the child’s adult height. Some of those viral factors are explained here.

1. Genetics and family history

The parents’ height plays a significant role in how tall the child will be — the genes determine around 80% of the child’s adult height (1). That is why children grow up to a height that is more or less the same as the parents’ height.

Note that a single gene doesn’t determine the height; more than 700 gene variants can influence how tall your child will be. An interplay of the genes influences the child’s height, as genes interact with one another in several ways, and could result in exceptions. It means that parents who are short may have a child who is tall, and tall parents may have a child with a shorter stature.

2. Health and nutrition

A child’s overall health plus the nourishment they receive will also influence their height. Malnourished children may develop a short stature as an adult. Children who do not get enough nutrition to support healthy growth are at risk of having short stature, in spite of their parents being tall.

Physical activity of the child may also have an influence on their height as an adult promoting a healthy lifestyle. Exercising promotes growth; however, experts state that regular exercise in childhood does not guarantee a better height as an adult.

3. Diseases and congenital problems

Several congenital problems and childhood diseases can impact the outcome of the child’s height as an adult. These conditions can be an outcome of poor nutrition or the result of a genetic anomaly. For example, rickets, which is caused by a low level of vitamin D in the body, is known to result in short stature (7).

A few examples of congenital genetic problems that cause a short stature are Noonan syndrome, Down syndrome, and Turner syndrome. Some conditions, like Marfan syndrome, can cause a child to become tall and slender (8). Some forms of cancer may also cause abnormalities in height (3).

4. Level of hormones

Hormonal imbalance can also influence the child’s height. Problems in the pituitary gland can cause too much or too little secretion of the growth hormone due to which the child could grow too tall or remain too short as an adult (9). The secretion of thyroid hormones plays an essential role too and such deficiency is frequently overlooked.

5. Medication

Certain medicines may have an impact on the adult height of the child. For instance, long-term use of inhaled corticosteroids by children with asthma may reduce the adult height by a centimeter (10). Nevertheless, the effect of the medicine on adult height can depend on the concentration of dosage, the duration of the prescription, and the overall health of the child.

Except for genetics and congenital problems, other factors may be controlled to some extent.

Calculator To Check Child’s Height

You can use the following resources to get a rough estimate of the average height your child is likely to attain. However, it should be noted that these resources have their limitations and that the child’s height could be influenced by many factors.

MomJunction height calculator

You can also try MomJunction’s height calculator that was developed to help parents to have a rough estimate of their child’s height.

  • Growth charts

Apart from calculators, growth charts can help you understand whether your child’s height is ideal for their age. These growth charts are prepared taking into consideration the average height of healthy children under various age groups.

CDC growth charts are created by the US Centers for Disease Control and Prevention for healthcare professionals and parents. You can plot the height of the child to know if they fall in the normal range.

The chart divides the height based on the percentile ranging from the 5th percentile to the 95th percentile. If your child’s height lies below the 5th percentile or is greater than the 95th percentile, then it is ideal to see a doctor.

The following are the charts for boys and girls:

CDC stature-for-age chart for boys
CDC stature-for-age chart for girls

When To Be Concerned About A Child’s Height?

It will be ideal to see a physician if:

  • The child is significantly shorter or taller than most children of their age. The best way to check is to compare the child’s height with that of their classmates or cousins of the same age.
  • There is a sudden and rapid increase in the height of the child who was otherwise displaying an average growth. This could mean puberty is starting and in early ages may be too soon and have a negative impact on final height.
  • The child appears to have stopped growing and is showing no signs of gaining height.
  • There is a change in the way the child grows after they started taking specific medicines.

Keeping track of the child’s height as they grow in age can help determine whether their growth pattern is normal.

While a good height is desirable, it shouldn’t be a concern as long as your child is healthy. Remember, the height of a child as an adult will depend on several factors, some of which may not be in your control. Continue to provide the best nourishment and lots of love to your little one so that they grow into healthy individuals with ideal weight and height.

How often do you track your child’s height? Tell us about it in the comments section below.


MomJunction's articles are written after analyzing the research works of expert authors and institutions. Our references consist of resources established by authorities in their respective fields. You can learn more about the authenticity of the information we present in our editorial policy.
1. Is height determined by genetics?; U.S. National Library of Medicine
2. Physical Changes During Puberty; American Academy of Pediatrics
3. Predicting a Child’s Adult Height; American Academy of Pediatrics
4. Evaluation of Short and Tall Stature in Children; American Academy of Family Physician
5. A.L. Creo and W.F. Schwenk, Bone Age: A Handy Tool for Pediatric Providers; American Academy of Pediatrics
6. A.M. Mughal et al., Bone Age Assessment Methods: A Critical Review; National Center for Biotechnology Information
7. Short stature; U.S. National Library of Medicine
8. Marfan syndrome; U.S. National Library of Medicine
9. Growth Disorders; U.S. National Library of Medicine
10. Y.K. Loke et al., Impact of Inhaled Corticosteroids on Growth in Children with Asthma: Systematic Review and Meta-Analysis; National Center for Biotechnology Information

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Rohit Garoo

Rohit Garoo is a zoologist-botanist turned writer with over 8 years of experience in content writing, content marketing, and copywriting. He has also done an MBA in marketing and human resources and worked in the domains of market research and e-commerce. Rohit writes topics related to health, wellness and development of babies. His articles featured on several notable websites, including... more