Height Calculator

It's a genuine clinical starting point, not a horoscope: the estimate defines a target, and about 95% of children reach an adult height within roughly ±4 inches (±8.5 cm) of it. That's a wide window — siblings with identical inputs routinely differ by several inches. Doctors use it to spot when a child's growth curve diverges meaningfully from their genetic expectation, which is its real job.

It centers the parental average on the child's sex: men average about 5 inches taller than women, so the formula adds half that difference (2.5 in / 6.5 cm) for boys and subtracts it for girls. That converts a mixed-sex parental average into a same-sex expectation.

Within the genetic range, yes: adequate nutrition (especially protein and overall calories), consistent sleep — growth hormone is secreted primarily in deep sleep — and managing chronic illness all matter, which is why average heights rose as nutrition improved historically. Nothing sold as a supplement adds inches beyond the genetic range, and growth ends when the growth plates close after puberty.

Yes — bone age: an X-ray of the hand read against skeletal maturity standards, done by an endocrinologist when there's a clinical question. Formula-wise, the Khamis-Roche method adds the child's current height, weight, and age for a tighter estimate. Mid-parental remains the standard quick screen because it needs only two numbers.