Height Calculator
Predict your child's adult height using scientific methods including the Khamis-Roche method and parental height analysis. Our comprehensive height calculator also includes unit conversion tools.
Height Calculator (Khamis-Roche Method)
This calculator uses the Khamis-Roche method, considered one of the most accurate height prediction methods for children aged 4-9 years.
Parents' Heights Only Calculator
This calculator uses only the parents' heights to predict the child's adult height. Ideal for unborn children or very young infants.
Height Converter
Convert height between metric units (centimeters) and US units (feet and inches).
How Tall Will I Be?
"How tall will I be?" or "how tall will my child be?" are questions that are often asked. The height of a person is determined by a combination of genetics and environmental factors. The precise contribution from these two factors is complex. Some studies suggest that genetics contributes 60%-80%.
Normally, a child's height is based on parental heights subject to regression toward the mean. This means that very tall or short parents are likely to have a taller or shorter child than average, but the child is likely to be closer to the average height than their parents.
Other important factors that contribute to a child's adult height include nutrition, health, sports activities, health and age of the mother during pregnancy, etc.
Growth Patterns
Infants and toddlers grow the fastest. The growth rate declines rapidly from birth to roughly age 2 and declines more slowly thereafter. During puberty, the growth rate increases again to a second maximum, after which it slowly declines to zero. This is typically referred to as the pubertal growth spurt. On average, female and male growth trails off to zero at about 15 and 18 years old, respectively.
Predicting a Child's Adult Height
Many different methods have been developed to predict a child's adult height, some more accurate than others. Regardless of how accurate the method, height prediction is not an exact science, and it is possible that a child's height can deviate significantly from what is predicted.
The Khamis-Roche Method
The Khamis-Roche method is considered to be one of the more accurate height prediction methods that do not require the measurement of bone age. It is based on the child's stature, weight, and the average stature of the two parents. Note that it is most applicable to Caucasian children between the ages of 4 and 9 who are free from any growth-related condition or disease.
Bone Age Method
Bone age can be used to predict height and is considered more accurate than the other methods. One such method is the Greulich-Pyle method that involves left hand and wrist radiographs to measure bone age. This method compares the radiograph of the patient to that of the nearest standard radiograph in the Greulich-Pyle atlas.