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Child Height Predictor Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Predicted adult height
174.0
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Child Height Predictor Calculator
The Child Height Predictor Calculator works out your predicted adult height in an instant. Enter mother's height, father's height and child's sex and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the mother's height.
- Enter the father's height.
- Choose the child's sex.
- Read off your predicted adult height — the calculator updates automatically, with no button to press.
Formula
The Child Height Predictor Calculator uses the formula:
Predicted adult height = (Mother's height + Father's height) ÷ 2 + Child's sex
Worked example
For example, with mother's height of 160 cm, father's height of 175 cm and child's sex of Boy, the predicted adult height is 174.0.
| Mother's height | 160 cm |
|---|---|
| Father's height | 175 cm |
| Child's sex | Boy |
| Predicted adult height | 174.0 |
|---|
Results are estimates for educational use, not professional advice.
Frequently asked questions
Average the parents' heights, then add 6.5 cm for a boy or subtract 6.5 cm for a girl. With a 160 cm mother and 175 cm father, a boy is predicted at about 174 cm.
The mid-parental method gives a rough estimate, usually within about 8–10 cm. Genetics, nutrition and health all affect the real outcome.
Yes. Good nutrition, sleep and health during growth help a child reach their genetic potential, while poor conditions can limit it.
Predictions are most useful as a general guide. Doctors can give better estimates using bone-age x-rays and growth charts.
The Child Height Predictor Calculator uses the formula: Predicted adult height = (Mother's height + Father's height) ÷ 2 + Child's sex. For example, with mother's height of 160 cm, father's height of 175 cm and child's sex of Boy, the predicted adult height is 174.0.
Enter the mother's height. Enter the father's height. Choose the child's sex. Read off your predicted adult height — the calculator updates automatically, with no button to press.
Related guides
Child Height Predictor Table: Predicted adult height by Mother's height
Reference table of predicted adult height for Child Height Predictor across a range of mother's height values — exact, engine-computed figures you can read off at a glance.
How to Calculate Child Height Predictor: Formula, Steps & Examples
Learn how to calculate Child Height Predictor — the formula explained step by step, with worked examples and a free calculator to check your answer.