How tall will my child be when they grow up?

A child's adult height is primarily determined by genetics (60-80%) and can be estimated using the mid-parental height method: For boys, add 5 inches to the mother's height, average with father's height. For girls, subtract 5 inches from father's height, average with mother's height. Results are typically accurate within 2 inches.

Can a late bloomer still grow tall?

Yes! Late bloomers often catch up and may even exceed early predictions. Children with delayed puberty (constitutional growth delay) typically experience their growth spurt 2-4 years later than peers but reach normal adult heights based on their genetic potential. Late bloomers may actually end up taller because they have more time to grow before growth plates close.

At what age do children stop growing?

Girls typically stop growing 2-3 years after their first period, usually by age 14-16. Boys continue growing until 16-18, with some growing into their early 20s. Growth plates (epiphyses) fuse at different ages, with late bloomers having delayed closure allowing for extended growth periods.

Is the height predictor accurate for adopted children?

For adopted children without biological parent height information, predictions are less accurate but can use the child's current growth percentile. Children tend to stay within their growth percentile, so a child at the 75th percentile at age 5 will likely be around the 75th percentile as an adult (approximately 5'10" for boys, 5'6" for girls).

What factors besides genetics affect a child's height?

While genetics account for 60-80% of height potential, other factors include nutrition (adequate protein, calcium, vitamin D), sleep quality (growth hormone is released during deep sleep), physical activity, overall health, and hormonal balance. Chronic illnesses or malnutrition during childhood can impact final adult height.

How accurate are child height predictors?

Height predictors using the mid-parental method are typically accurate within 2-4 inches (5-10 cm). Accuracy improves when considering the child's current height percentile, bone age (via X-ray), and pubertal stage. No prediction method is 100% accurate, as individual growth patterns vary based on numerous genetic and environmental factors.

What is the most accurate height predictor?

The most accurate everyday height predictor is the mid-parental (Tanner) method combined with the child's current growth percentile, which is what this calculator uses. For clinical-grade accuracy, doctors add a bone-age X-ray (Bayley-Pinneau or Khamis-Roche methods), but for most families the mid-parental estimate lands within about 2 inches of final adult height.

How does a height predictor based on parents' heights work?

It averages the mother's and father's heights with a gender adjustment: for boys, add 5 inches (13 cm) to mom's height before averaging with dad's; for girls, subtract 5 inches from dad's height before averaging with mom's. The result is the child's genetic target height, and most children finish within 2-4 inches of it.

Height Predictor

This height predictor estimates your child's adult height from both parents' heights using the mid-parental method, accurate within about 2 inches for most children. Add your child's current height to refine the prediction.