Future Child Height Predictor: Adult Height Calculator Free
Estimate your child adult height with the pediatric Tanner formula.
Enter father and mother heights to get an estimated adult height for the boy or girl, with its likely range.
By VOV · Last updated: October 21, 2026
How it works
How it works: the Tanner mid-parental height formula: boy = (father + mother + 13) / 2, girl = (father + mother − 13) / 2, in centimeters. The usual range is ±8.5 cm. A statistical estimate: nutrition, health and other factors matter.
Use cases
- Estimate how tall your child will be as an adult based on your height and your partner's
- Predict your daughter's future height to find out whether she will grow taller than you someday
- Project your teenage son's growth so you can buy him clothes in the right size
Frequently asked questions
How accurate is it?
Within ±8.5 cm in most cases. It is the reference formula pediatricians use, not an exact prediction.
What else influences height?
Childhood nutrition, sleep, exercise and general health can move the result several centimeters either way.
Does it work for teenagers?
Yes, but if the puberty growth spurt already happened the estimate loses meaning: track the growth curve with the pediatrician.