Child Height Predictor
Predict the height of your child by entering the child’s height and weight and the height of the parents. This calculator considers the parent’s genetics and the child’s height and weight to estimate a child’s adult height.
How to Predict How Tall a Child Will Be as an Adult
There are several formulas available to help estimate a child’s adult height, and they vary in accuracy.
Child’s Height at Age 2 Method
By far the easiest (and probably least accurate) way of predicting a child’s adult height is to double their height when they turned two years old. This is sometimes referred to as the two years times two method.
Keep in mind that boys will often be slightly over this number, and girls will typically be slightly lower due to slight variances in growth rates. This method usually works because children often reach their growth percentile that they will remain in at age 2.
Mid-Parental Height Method
A slightly more sophisticated method for predicting a child’s future height is called the mid-parental height method. You can use it to predict their adult height like this:
- Add the mother’s height and the father’s height in inches
- If the child is a boy, add 5 inches (12.7 cm) to that measurement; if it’s a girl, then subtract 5 inches (12.7 cm)
- Divide the number by 2 to get an estimated adult height
One way to predict a child’s height is to use a growth chart such as one released by the CDC to predict how tall a child will grow.
Growth charts compare a child’s height and weight with other children that are the same age and consider what percentile the child is in for height to estimate growth.
The Khamis-Roche Method
The Khamis-Roche method relies on scaling factors and other equations based on the child and parents’ height to make its estimate. It considers the child’s height and weight and also the height and weight of the parents.
The Khamis-Roche method is especially useful for predicting the height of children with unusual stature for their age.
This method is only considered accurate for children over the age of 4.
This calculator uses the Khamis-Roche Method for children over 4 and the Mid-Parental Height Method for children under 4.
Every Child is Different
Many factors contribute to a child’s growth, including genetics, environmental factors, nutrition, and health. Genetics play a major role in a child’s height and weight, but do not completely determine how much a child will grow.
Every child is different and will develop differently as well. Some children stop growing sooner or later than others and experience growth spurts at slightly different ages. Because of this, any prediction of a child’s height as an adult is only an estimate.
- Bishop, S., Child’s Height at Age 2 May Predict Adult Height, Mayo Clinic News Network, https://newsnetwork.mayoclinic.org/discussion/childs-height-at-age-2-may-predict-adult-height/
- American Academy of Pediatrics, Predicting a Child’s Adult Height, healthychildren.org, 1/27/2016, https://www.healthychildren.org/English/health-issues/conditions/Glands-Growth-Disorders/Pages/Predicting-a-Childs-Adult-Height.aspx
- Wright, C. M., Cheetham, T. D., The strengths and limitations of parental heights as a predictor of attained height, Archives of Disease in Childhood, 1999, 81(3), 257-260. https://adc.bmj.com/content/81/3/257
- Centers for Disease Control, Growth Charts, https://www.cdc.gov/GrowthCharts/
- Khamis, H., Roche, A., Predicting Adult Stature Without Using Skeletal Age: The Khamis-Roche Method, Pediatrics, Oct 1994, 94(4), 504-507. https://pediatrics.aappublications.org/content/94/4/504