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Child Height Predictor

Predict your child’s adult height from both parents’ heights using the mid-parental height method — with the likely range, in cm or feet and inches.

The mid-parental height method

Paediatricians often estimate a child’s genetic target height from the parents’ heights (Tanner, 1970):

Boys: (father’s height + mother’s height + 13 cm) ÷ 2
Girls: (father’s height + mother’s height − 13 cm) ÷ 2

About 95% of children end up within 8.5 cm above or below this target. The 13 cm reflects the average height difference between men and women.

What affects final height	How
Genes	The biggest factor — this is what the calculation captures
Nutrition	Protein, calcium, iron and enough calories in childhood
Health	Chronic illness, hormone problems and poor sleep can limit growth
Timing of puberty	Early or late puberty changes when growth stops, not always final height

Doctors can make a more accurate prediction using a hand X-ray (bone age). If your child is much shorter than their target range, or growth slows down, see a paediatrician. Track growth with the growth percentile calculator and support it with the kids diet chart.

Frequently asked questions

How accurate is the height predictor?

It gives a range: most children finish within ±8.5 cm of the target. It cannot account for nutrition, illness or puberty timing.

Can a child grow taller than both parents?

Yes. Better nutrition and health than the parents had, and the natural spread of genes, mean many children do.

When do children stop growing?

Girls usually stop around 14–16 years (about 2 years after their first period) and boys around 16–18 years.

Sources: Tanner JM et al. Standards for children’s height allowing for heights of parents (1970) · NHS: Growth and development

Reviewed for accuracy against the sources above. This page is general information, not medical advice — talk to your doctor about your own health.

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