Height Predictor Calculator

Average both parent heights, then add 2.5 inches (6.5 cm) for a boy or subtract 2.5 inches (6.5 cm) for a girl. For example, if the father is 70 inches and the mother is 64 inches, the average is 67 inches, giving a predicted adult height of about 69.5 inches for a boy and 64.5 inches for a girl. Actual adult height typically falls within plus or minus 4 inches of this estimate.

The mid-parental method gives an estimate within a range of roughly plus or minus 4 inches (10 cm). It captures genetic tendency but cannot fully account for nutrition, health conditions, hormonal factors, or environmental influences on growth.

Boys: predicted adult height = ((father height + mother height) / 2) + 2.5 inches (6.5 cm). Girls: predicted adult height = ((father height + mother height) / 2) - 2.5 inches (6.5 cm). Use the same units (inches or centimeters) for both parents.

Most females reach full adult height by age 14 to 16, while most males continue growing until age 16 to 18. A small number of individuals may grow slightly until their early 20s. Peak growth velocity occurs during puberty, around 8-9 cm/year for boys and 7-8 cm/year for girls.

Use the same mid-parental formula. If you are a teenager and your father is 178 cm and your mother is 163 cm, the average is 170.5 cm. As a boy you would predict about 177 cm; as a girl about 164 cm, plus or minus 10 cm. For a more personalized estimate, the Khamis-Roche method uses your current height, weight, and age.

Yes, but the mid-parental method is the most reliable predictor before puberty because it relies on genetics rather than current size. Toddler and baby height percentiles can also be tracked on growth charts; children who stay on a steady percentile typically reach an adult height close to their mid-parental estimate.

Yes. Adequate nutrition, especially protein, calcium, and vitamin D during childhood and adolescence, supports growth toward genetic potential. Poor nutrition, chronic illness, or hormonal issues can result in shorter adult height than the mid-parental estimate suggests.

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