Child Height Predictor

“How tall will my child be?” is a question every parent wonders about. Height is strongly influenced by genes, so the most widely used estimate — the mid-parental height method used by paediatricians — is based on the parents' heights. This child height predictor gives the estimated adult height with its usual range, in centimetres and feet, and lets you cross-check with the traditional “double the height at age 2” rule.

How to use it

Choose boy or girl and enter both parents' heights in centimetres.
Optionally add the child's height at 2 years (boys) or 18 months (girls).
Read the predicted height and range.

Formula

Boy: (father + mother + 13) ÷ 2 · Girl: (father + mother − 13) ÷ 2 · range ± 8.5 cm

Example

If the father is 172 cm and the mother 157 cm, a son's predicted adult height is (172 + 157 + 13) ÷ 2 = 171 cm (about 5 ft 7 in), most likely between 162.5 and 179.5 cm. A daughter's would be (172 + 157 − 13) ÷ 2 = 158 cm (about 5 ft 2 in). For adults, check a healthy weight for a given height with the ideal weight calculator and theBMI calculator.

Health disclaimer: This tool gives general estimates for information only and is not medical advice, diagnosis or treatment. Please consult a qualified doctor about your health. Read the full disclaimer.

Frequently asked questions

How accurate is a child height prediction?

The mid-parental method gives a target range — about 8.5 cm either side of the estimate covers most children. Nutrition, health, sleep and physical activity during childhood and puberty also influence final height, so treat it as a guide, not a promise.

What is the “double the height at 2” rule?

A boy’s height at 2 years (girl’s at about 18 months) multiplied by two gives a rough estimate of adult height. It’s a quick traditional check that roughly agrees with the parents-based method for many children.

Can my child grow taller than predicted?

Yes, within limits. A balanced diet with enough protein, calcium and vitamin D, good sleep, regular exercise and treating illnesses early help a child reach their genetic potential. Supplements can’t make a healthy child grow beyond it.

When should I worry about my child’s height?

If your child is much shorter than other children of the same age, has stopped growing, or is growing much faster than expected, ask your paediatrician. Doctors use growth charts (such as IAP charts for Indian children) to check growth over time.