Child Height Predictor — Two Standard Methods

How to use

1. Enter the child's sex, age and current height.
2. Enter both parents' heights.
3. Read both estimates and the range.

General information only — not medical, financial or legal advice. Figures cross-checked against public official sources (IRS / HMRC / NHS / WHO guidance); content last reviewed September 2026. For decisions that matter, confirm with a licensed professional in your country.

About this tool

Two simple methods are used in practice. The mid-parental method averages the parents' heights, adds about 13 cm for a boy or subtracts about 13 cm for a girl, then divides by two; most children land within roughly 8 cm either side of that figure. The doubling method says a boy's height at two years and a girl's at eighteen months roughly doubles by adulthood. Both are population averages — nutrition, sleep, health and timing of puberty move the real number, and a paediatrician tracking the growth curve over time will always beat a single estimate.

FAQ

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