Child Height Calculator

“How tall will I be?” or “how tall will my child be?” These questions capture the curiosity of parents and children alike. So, if you are wondering how tall will be your child, simply put in both parents height below and our height calculator will give you the estimated height of your child.

Prediction Based on the Parents’ Heights Only

Child Height Calculator

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Prediction Including Child’s Growth

Height prediction based on the child’s current growth included with parental information.

This specific calculator based on parent’s heights and data tables is from MDApp.

Basics of Height Prediction

Height is determined by a complex interplay between genetics and environment.

Studies indicate that 60%-80% of height is inherited genetically.

The remaining percentage is influenced by environmental factors, such as nutrition and overall health.

Predicting height involves various models, each with its own degree of accuracy, but it is important to remember that these predictions are not exact.

Methods for Predicting Height

1. Simple Genetic Calculators

For a straightforward estimate, adding 2.5 inches (6.4 cm) to the average of the parents’ heights for boys, or subtracting 2.5 inches for girls, offers a quick prediction. Our first height predictor is based on this simple method. Another method doubles the child’s height at age 2 (or 18 months for girls).

2. Khamis-Roche Method

A non-invasive and widely used method, the Khamis-Roche formula calculates expected adult height based on the child’s current height, weight, and the parents’ heights. It is best applied to children aged 4-9 without growth-affecting conditions. Second calculator above basically uses this method along with charts data to height estimation. This method original data involve only caucasian children and based on that all equations were derived so it is most accurate for the caucasian population.

3. Bone Age Assessment (Greulich-Pyle Method)

This method involves analyzing X-ray images of the left hand and wrist to assess bone age, comparing these with a standard atlas to predict height based on skeletal maturity. Although historically accurate, its relevance for diverse populations today may be limited due to its original data set from early 20th century Caucasian children.

4. Using CDC Growth Charts

These charts help track a child’s growth by comparing their height, weight, and other measurements against standardized percentiles for U.S. children. Consistent patterns in growth charts can give insights into a child’s future height.

Factors Influencing Height

Genetics and Height

Genetic inheritance plays a predominant role in determining a child’s height. The height of the parents often gives a direct indication of how tall the child might become.

Although genetics set the foundational potential for height, it’s important to note that genetic diversity within a family means this isn’t an absolute predictive measure.

Nutrition’s Impact on Growth

Nutrition is a cornerstone of growth and development, influencing height significantly. During the formative years of a child’s life, particularly infancy, childhood, and adolescence, receiving adequate nutrition is important to reach full height potential.

Essential nutrients, including proteins, calcium, vitamins, and minerals, contribute directly to bone health and development. A well-balanced diet rich in these nutrients can help a child achieve their maximum genetic potential for height.

Conversely, nutritional deficiencies during these critical periods can lead to stunted growth and other developmental issues, emphasizing the importance of a nutritious diet.

Health Conditions and Physical Activity

Overall health and physical activity are also critical factors affecting height. Regular physical activities, sports, and exercises can enhance growth rates by improving blood circulation, which in turn boosts nutrient and oxygen delivery to growth plates. Moreover, physical activity stimulates the production of growth hormones, which are vital for normal development.

Puberty Growth Spurt

The pubertal growth spurt is another critical factor in height development, characterized by a rapid increase in height and other secondary sexual characteristics during puberty.

This period is crucial as it accounts for about 17-20% of total adult height.

Typically, girls enter puberty earlier than boys and may start experiencing these growth spurts by around age 10, usually finishing their height growth by age 15. Boys, on the other hand, start their pubertal growth around age 12 and continue to grow until about age 18.

The timing and magnitude of these growth spurts can vary significantly and are influenced by both genetics and environmental factors.

The amount of growth hormone produced during this time can greatly influence the overall growth during puberty, which is why addressing any hormonal imbalances or deficiencies during these years is crucial.

Growth and Development: Environmental and Health Impacts

  • Maternal Health: The health and age of the mother during pregnancy can influence the newborn’s future height.
  • Infancy and Toddler Growth Rates: Rapid growth occurs until about age 2, slows until puberty, and then a second growth spurt occurs.
  • Aging and Height Shrinkage: Beginning in middle age, individuals may lose height due to spinal compression and other natural bodily changes.

How to Promote Optimal Growth

Ensuring the best conditions for growth involves maintaining a healthy lifestyle:

Diet: Emphasizing Whole, Nutritious Foods

A balanced and nutritious diet is fundamental for proper growth and development. It’s crucial to focus on unprocessed, whole foods that provide essential nutrients.

This includes a variety of fruits and vegetables, which offer vitamins and minerals crucial for bone health and immune function.

High-quality proteins are necessary for muscle and tissue repair and growth, while dairy products supply calcium, which is vital for strong bones.

Incorporating whole grains can also contribute beneficial fiber and additional nutrients. Avoiding processed foods high in sugar and unhealthy fats is equally important as these can lead to obesity and other health issues that may impede growth.

Exercise: Building Strength and Vitality

Regular physical activity is key to promoting healthy growth and development. Exercise not only strengthens bones and muscles but also enhances the circulatory system, ensuring that essential nutrients efficiently reach growth plates.

Activities like running, swimming, or team sports are particularly beneficial as they are engaging and can improve both physical stamina and heart health.

Encouraging children to participate in physical activities from an early age can establish healthy habits that continue into adulthood.

Posture and Sleep: Foundations for Growth

Maintaining good posture is important not just for appearance but also for proper bone development and alignment. Poor posture can lead to spinal and skeletal issues that might affect overall height and health.

Teaching children about good posture and providing them with ergonomic furniture, like supportive chairs and desks, is a positive step.

Sleep plays a critical role in growth as it is during deep sleep that the body releases growth hormones. Ensuring that children get adequate and quality sleep is essential.

The amount of sleep needed can vary by age, but younger children generally require more to support their rapid growth and development. Establishing a regular, soothing bedtime routine can improve sleep quality and ensure that children rest adequately each night.

Height Prediction Tools

Our child height predictor uses formulas and statistical data to estimate a child’s adult height based on simple inputs like the child’s current age, height, weight, and the parents’ heights.

By using both the gender-specific mid-parental formula and modern statistical methods, we can provide a range of probable adult heights.

Words of Caution:

While height predictors provide useful estimates, the true height a child achieves can vary due to many factors. Genetics provide the framework, but nutrition, health, and lifestyle choices play significant roles in achieving potential height. By understanding and optimizing these factors, parents can help support their child’s growth and overall development.


How Reliable Is the Average Parent Height Method?

The average parent height method, which involves taking the mean of the parents’ heights and adjusting for the child’s gender, provides a basic estimate of a child’s future height. This method is generally reliable but simplistic as it does not account for the wider genetic variance and environmental factors that can influence growth. It’s a good starting point but should be used alongside other assessments for more accuracy.

How Reliable Is the Height Calculator?

The Khamis Calculator estimates a child’s adult height with a margin of error—2.1 inches for boys and 1.7 inches for girls. This margin tends to be larger during puberty and decreases as the child grows older. Designed for use in children aged 4 to 17, it provides a useful but approximate guide to predicting adult height.

Can Short Parents Have a Taller Child?

Yes, short parents can have a taller child. While parents’ heights are a significant factor, genetic diversity means children can inherit traits from more distant ancestors. Additionally, optimal environmental conditions like good nutrition and health care can enable a child to reach their upper genetic potential, surpassing their parents’ heights.

Can We Grow After Puberty?

Growth after puberty is typically minimal. Most of the height is gained before or during puberty, as growth plates tend to close afterward, ending further bone elongation. However, small changes in height may occur due to increased muscle mass, improved posture, or spinal decompression achieved through exercise and proper nutrition.

Is It Bad if a Child Grows More Than the Expected Range?

Growing beyond the expected range is not typically concerning and can be a sign of good health and nutrition. However, if growth is excessively beyond normal expectations, it may be wise to consult a healthcare provider to rule out medical conditions like hormonal imbalances that can cause unusual growth patterns.


  1. Predicting adult stature without using skeletal age: the Khamis-Roche method
  2. Bone age: assessment methods and clinical applications
  3. The strengths and limitations of parental heights as a predictor of attained height
  4. Genetic and Environmental Contributions to the Association Between Body Height and Educational Attainment: A Study of Adult Finnish Twins 
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