Height Calculator

A child’s eventual adult height is strongly shaped by inherited genetics, but it is not fixed by any single gene or rule — it emerges from the combined, small effect of many genes plus the child’s own health and nutrition while growing. The mid-parental height method leans on a well-documented population pattern: averaged across many families, a child’s adult height correlates fairly closely with the average of both parents’ heights. This calculator turns that correlation into a single reference figure — the height a child of a given sex would be expected to reach on average, given these two parents — rather than measuring the child directly.

Mid-parental height, sometimes called "target height," has been used in pediatric growth assessment for decades as a quick, low-cost benchmark. Unlike a growth chart, it needs no measurement of the child at all — only the two parents’ adult heights and the child’s sex — which is why it is often calculated early, sometimes even before birth, purely as a rough point of comparison rather than a diagnostic tool.

Height is among the most heritable traits studied in humans, but heritability is a population-level statistic, not a guarantee for any one child. A number of other influences act alongside genetics over the growing years:

Pediatricians monitor growth quite differently in practice: they plot repeated height measurements over months and years on standardized growth charts and watch the percentile curve a child follows over time. A child tracking steadily along roughly the same percentile is generally viewed as growing consistently, regardless of exactly where that percentile sits, while a child’s curve crossing several percentile lines is often what prompts closer attention. Mid-parental height works best as a single rough anchor to compare that ongoing chart against — a starting expectation, not a substitute for tracking a specific child’s own growth over time.