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Quick answer: enter both parents' heights and the child's gender above — the predictor uses the mid-parental (Tanner) formula pediatricians use, and shows the predicted adult height plus a likely range.
Child height predictor
Short answer: a child height predictor estimates adult height from parents' heights: for a boy, (father + mother + 13 cm) ÷ 2; for a girl, (father + mother − 13 cm) ÷ 2. Try it above — most children land within ±8.5 cm of the prediction.
How tall will my child be?
Short answer: genetics is the strongest factor. Enter both parents' heights above for the pediatrician-standard estimate — e.g. a 180 cm father and 165 cm mother predict a ~179 cm son or ~166 cm daughter, each ±8.5 cm.
Height calculator for boys
Short answer: for a boy, add 13 cm (5 inches) to the mother's height, add the father's height, and divide by 2. Select "Boy" above and enter both heights — the calculator does the rest.
Mid-parental height formula
Short answer: the mid-parental (Tanner) method: Boy = (Father + Mother + 13 cm) ÷ 2; Girl = (Father + Mother − 13 cm) ÷ 2. It's the standard formula pediatricians use to estimate a child's genetic height potential, accurate within about ±8.5 cm for most children.
Frequently asked questions
How accurate is the child height predictor?
The mid-parental method predicts within about ±8.5 cm (±3.3 in) for most children. It's a genetic estimate — nutrition, sleep, health and hormones all shift the final result. If you're concerned about growth, consult a pediatrician.
What is the formula to predict a child's height?
Boy: (father's height + mother's height + 13 cm) ÷ 2. Girl: (father's height + mother's height − 13 cm) ÷ 2. In inches, use 5 inches instead of 13 cm.
Can a child be taller than both parents?
Yes. Better nutrition and healthcare mean newer generations are often slightly taller, and genetic variation means children don't simply average their parents. The ±8.5 cm range accounts for this.
When do boys and girls stop growing?
Girls typically stop growing around 14–15, a couple of years after menstruation begins. Boys often keep growing until 16–18, sometimes into their early 20s.
Does nutrition affect final height?
Yes — adequate protein, calcium, vitamin D and sleep (growth hormone releases during deep sleep) all matter. Chronic illness or hormone imbalances can also affect growth.
Is this height predictor free?
Yes — unlimited predictions, free forever. No account, no limits. Everything runs in your browser.