How tall will my child be?

The honest answer is a range, not a number. This page gives one from the child’s height percentile today and, if you add them, the parents’ heights. Expect the range to be wide for a young child and to narrow through the teens.

What is mid-parental height?

The average of both parents’ heights, plus 6.5 cm for a boy or minus 6.5 cm for a girl. It is a genetic target, and it carries roughly ±8 cm of spread on its own — which is why it is shown here as a band rather than a figure.

Why is no single predicted height shown?

Because the method does not support one. A point value reads as a promise, and parents remember it for years. The range is what the arithmetic actually produces.

No. Bone-age methods such as Greulich-Pyle or Bayley-Pinneau need a hand X-ray and a clinician to read it. Nothing here needs anything a parent cannot measure at home.

Calculators

Child height predictor

How tall a child is likely to be grown up — as a range, not a number. Built from the height percentile today against WHO 2006/2007, and from the parents’ heights when you have them.

Everything is computed in your browser. What you type is never sent to a server and is never stored.

Fill in the fields to see the position

How to read this number

Every calculator that answers this with one number is overstating what the method can do. The mid-parental estimate alone carries about ±8 cm, and a toddler’s percentile is a weak predictor of their adult percentile. A range is the honest form of this answer.

Two independent estimates go in. The first carries the child’s height percentile forward: a child at the 60th today is most likely near the 60th as an adult. The second is the genetic target from the parents’ heights — the mid-parental height, plus 6.5 cm for a boy or minus 6.5 for a girl.

Where the two disagree, the wider range wins rather than an average. Two methods pointing at different answers is information about how uncertain this is, and averaging would hide it.

The band narrows with age, and that is the main thing to take from it: at two or three it is wide enough to be almost useless; after puberty starts it tightens. Bone-age methods are not used here — they need an X-ray, which is a clinic’s job, not a web page’s.

The standard behind it

This calculator uses WHO Child Growth Standards (2006) · WHO Growth Reference (2007)’s LMS parameters. Ages 0–5 use the 2006 Child Growth Standards and 5–19 the 2007 growth reference; the two join at five.

The source tables are taken straight from who.int, data version 2026-08-25. Ages beyond what a standard covers are never extrapolated — the page says there is nothing there.

Common questions

How tall will my child be?: The honest answer is a range, not a number. This page gives one from the child’s height percentile today and, if you add them, the parents’ heights. Expect the range to be wide for a young child and to narrow through the teens.
What is mid-parental height?: The average of both parents’ heights, plus 6.5 cm for a boy or minus 6.5 cm for a girl. It is a genetic target, and it carries roughly ±8 cm of spread on its own — which is why it is shown here as a band rather than a figure.
Why is no single predicted height shown?: Because the method does not support one. A point value reads as a promise, and parents remember it for years. The range is what the arithmetic actually produces.
Is bone age used?: No. Bone-age methods such as Greulich-Pyle or Bayley-Pinneau need a hand X-ray and a clinician to read it. Nothing here needs anything a parent cannot measure at home.