Height Calculator

What will my height be?

A combination of genetics and environmental factors determines a child’s ultimate adult height. While the precise contribution of each element can be difficult to pinpoint, extensive research shows that heredity accounts for roughly 60–80% of an individual's final stature.

In most cases, medical experts estimate a child's future height based on their parents' stature, a concept subject to "regression to the mean." This means that while exceptionally tall or short parents are likely to have children who are also taller or shorter than average, the child's final height will typically lean closer to the general population's average than their parents' extreme heights.

Beyond genetics, several crucial environmental variables influence a child’s development. Early childhood nutrition, overall wellness, physical activity levels, and the mother's health and age during pregnancy all play significant roles in determining adult height.

Human growth is most rapid during infancy and early childhood. The growth rate decreases significantly from birth to age two, continuing at a steadier, slower pace throughout childhood. During puberty, adolescents experience a massive acceleration in vertical growth—commonly known as the "pubertal growth spurt"—before growth gradually declines to zero. Typically, female growth halts around age 15, while male growth stops at approximately age 18.

Interestingly, a person’s height often slightly decreases beginning in middle age. This gradual loss of stature is almost universal among the elderly and is primarily caused by the natural compression of intervertebral discs and structural changes associated with degenerative joint diseases.

Estimating a child's adult height

Medical professionals and researchers have developed various methods for predicting a child’s future adult height, with varying degrees of reliability. However, using a child height predictor is not an exact science. No matter how sophisticated the approach, a child’s final adult stature may still differ significantly from the predicted outcome.

Skeletal maturity technique (Bone Age)

Assessing skeletal maturity, or "bone age," is widely considered the most accurate method for height prediction. One common clinical strategy is the Greulich-Pyle technique, which evaluates radiographs (X-rays) of the left hand and wrist. Doctors compare the patient’s X-ray to standard reference images in the Greulich-Pyle atlas, a comprehensive database of human bone development.

By calculating the percentage of skeletal development based on the child’s current height, bone age, and atlas data, medical experts can reliably forecast future growth. It is worth noting, however, that the foundational data in this atlas was collected from Caucasian children between 1931 and 1942, which may slightly limit its predictive accuracy for modern, diverse populations.

The Khamis-Roche method

The Khamis-Roche method is widely recognized as one of the most accurate adult height prediction models that does not require X-rays or bone age measurements. Instead, this formula calculates future stature based on the child's current height, current weight, and the mid-parental height (the average height of both parents). We utilize this scientifically validated algorithm in our primary height calculator.

Statistically, it is most accurate for healthy Caucasian children aged 4 to 9 who do not have any underlying growth-related illnesses or medical conditions.

Using growth charts

Standardized CDC growth charts provide essential benchmarks for tracking and assessing a child’s developmental status over time. The percentile curves within these charts illustrate the distribution of specific body measurements among children in the United States. Pediatricians rely on a series of 16 distinct charts to compare a child’s progress against national averages.

By plotting your child's expected height, weight, and head circumference relative to their specific age and biological sex, you can track their unique growth trajectory. Because a child’s developmental curve generally remains consistent throughout their youth, these percentile charts serve as a highly effective tool for estimating their final adult height.

Simplistic techniques

For a faster estimate, there are several simple—though admittedly less accurate—mathematical formulas available. One popular mid-parental method involves taking the average height of both parents, then adding 2.5 inches (7.6 cm) for a boy, or subtracting 2.5 inches (7.6 cm) for a girl. We provide this straightforward estimation strategy in our secondary height calculator above.

Another popular "rule of thumb" method involves measuring the child's height at exactly age 2 for a boy, or 18 months for a girl. By simply doubling this measurement, you can easily approximate their future adult stature.

How can I get taller?

As previously established, an individual's final height is heavily dictated by genetics (accounting for roughly 60–80% of the variance). Tall parents naturally tend to have taller children, while shorter parents typically have shorter children (though the child's ultimate height will generally trend closer to the standard population average than their parents' height).

Once a teenager completes their pubertal growth spurt, vertical growth effectively ceases. Girls generally reach their maximum height by age 15, whereas boys finish growing at about age 18.

However, you can still optimize your genetic potential while actively growing. Various environmental and lifestyle factors heavily influence a child’s final height. While early developmental factors—such as a mother’s diet and overall health during pregnancy—are uncontrollable, ongoing childhood nutrition and daily habits are entirely manageable.

The following are evidence-based lifestyle suggestions to help provide the best possible conditions for your body to maximize its growth:

• Eat a nutrient-dense diet: Consume plenty of fresh fruits, vegetables, whole grains, lean proteins, and calcium-rich dairy products to fuel optimal cellular growth.
• Limit unhealthy foods: Avoid excess processed sugars, trans fats, heavily saturated fats, and sodium-rich meals that offer empty calories without essential growth nutrients.
• Stay physically active: Regular workouts and physical activities help strengthen bones and muscles, promote a healthy body weight, and reduce the long-term risk of bone-density conditions like osteoporosis.
• Maintain proper posture: Chronic slouching not only makes you appear instantly shorter but can also permanently alter the natural curvature of your spine over time. Stand and sit up straight to maximize your physical frame.
• Prioritize high-quality sleep: Adequate rest is critical for natural development. Younger children and adolescents require significantly more sleep than adults. Chronic sleep deprivation during crucial developmental years can stunt maximum growth, as the body primarily secretes human growth hormone (HGH) during deep sleep cycles.
• Consult a medical professional: In rare situations, underlying medical conditions or hormone deficiencies can inhibit natural growth. If you have serious concerns, a physician or endocrinologist can evaluate your growth chart and offer medical guidance.

Ultimately, a person achieves their maximum physical height shortly after the conclusion of puberty. Once the growth plates fuse, this height will generally remain constant throughout adulthood until the natural spinal compression begins in later life.

• Mari Satoh, “Bone age: assessment methods and clinical applications,” Clinical Pediatric Endocrinology, 2015
• Khamis HJ, Roche AF, “Predicting adult stature without using skeletal age: the Khamis-Roche method,” Pediatrics, 1994