Height Calculator

How Tall Will You Be?

This calculator estimates adult height for children and teens based on current height, age, sex, and parental heights. The mid-parental height method is the most widely used approach: add the mother's and father's heights, divide by two, then add 2.5 inches for boys or subtract 2.5 inches for girls. This gives a target that most children reach within 2 to 4 inches. For a more refined prediction, the calculator factors in the child's current height percentile and growth trajectory.

Growth Patterns by Age

Children grow at a relatively steady rate of about 2 to 2.5 inches per year from age 2 until puberty. During puberty, growth accelerates to 3 to 4 inches per year for girls (typically between ages 10 and 14) and 3 to 5 inches per year for boys (typically ages 12 to 16). Most girls reach their adult height by 14 to 16, while most boys continue growing until 16 to 18. Late bloomers may add height into their early twenties, though this is uncommon.

Factors That Influence Adult Height

Genetics account for roughly 60–80% of adult height variation. Nutrition during childhood and adolescence plays a significant role – adequate protein, calcium, vitamin D, and overall calorie intake support maximum growth potential. Chronic illness, hormonal conditions, and severe stress during growth years can limit height. Sleep quality matters because growth hormone is primarily released during deep sleep. Children who consistently get less sleep than recommended for their age may not reach their full genetic height potential.

When to Consult a Doctor

If a child's growth rate falls below 2 inches per year before puberty, drops off their established percentile curve, or shows no signs of puberty by age 14 (girls) or 15 (boys), a medical evaluation is appropriate. Growth hormone deficiency, thyroid disorders, and other conditions are treatable when caught early. A bone age X-ray can show how much growth potential remains by comparing skeletal maturity to chronological age.

Frequently asked questions