Child Height Predictor
Predict a child's adult height from the parents' heights using the mid-parental height method, in cm or feet and inches.
Last reviewed by the Radiatus Cloud team
Uses the mid-parental height method: (mother + father) / 2 ± 6.5 cm (add for boys, subtract for girls). Actual adult height typically falls within ±8.5 cm of the estimate. Educational only.
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Predict a child’s adult height
Parents often wonder how tall a child will grow, and the parents’ heights give a reasonable prediction. This predictor estimates a child’s adult height from the parents’ heights using the mid-parental method.
Why parents’ heights predict a child’s
Adult height is strongly influenced by genetics, so the average of the parents’ heights, adjusted for the child’s sex, gives a reasonable prediction of where a child will land. The mid-parental method does exactly this, and it produces an estimate with a range around it, because genetics is not the whole story, nutrition and other factors matter too. It is a fun and roughly reliable prediction, best understood as a central estimate with real uncertainty around it rather than a precise forecast.
A health estimate
This is an estimate from a standard formula for general information, not medical advice; individual health depends on far more than any single number, so consult a professional for anything that matters. It runs entirely in your browser, so nothing you enter is uploaded, keeping your figures on your own machine.
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Frequently Asked Questions
How does the mid-parental method work?
It averages the parents’ heights, adjusted for the child’s sex, to predict adult height, since height is strongly influenced by genetics.
How accurate is the prediction?
It gives a reasonable central estimate with a range around it, because nutrition and other factors also affect height, so it is not precise.
Why adjust for sex?
Because adult male and female heights differ on average, so the adjustment tailors the parental average to the child’s expected range.
Is genetics the only factor?
No. Nutrition, health and other factors also influence height, which is why the prediction has a range rather than a single number.
Is this medical advice?
No. It is a general estimate for interest. Consult a professional about growth concerns.
Privacy & Security
Runs entirely in your browser. No data is sent to any server.
How to Use
Select the child's sex, choose units, and enter both parents' heights to see the predicted adult height and likely range.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
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