Child Height Predictor
Predict adult height from parents’ heights and growth so far. Free, private and instant.
How to use the Child Height Predictor
- Pick metric (cm, kg) or imperial (ft, in, lb) units.
- Choose sex: Male or Female.
- Enter mother’s height.
- Enter father’s height.
- Enter child’s age (optional) in years and months - optional.
- Enter child’s current height (optional) - optional.
- Press Calculate to get an instant result with a colour scale, chart and plain-English explanation.
About the Child Height Predictor
Predict your child’s likely adult height using the mid-parental height formula and, if you add the child’s age and height, their current growth percentile. The result shows a likely range and how it compares with the average adult.
Also known as: adult height predictor, how tall will my child be, mid-parental height calculator, height predictor.
Worked example
- Sex: Male
- Mother’s height: 163 cm
- Father’s height: 177 cm
Predicted adult height: 177 cm (Average · 177 cm). Using the mid-parental method, a boy with these parents is likely to reach about 177 cm, most likely between 168 cm and 185 cm.
- Predicted adult height: 177 cm
- Likely range: 168 cm - 185 cm
- Mother / father: 163 cm / 177 cm
- Average adult height: 171 cm
Formula and cut-offs
Boys: (mother + father + 13 cm) / 2. Girls: (mother + father - 13 cm) / 2. About 95% of children finish within 8.5 cm of this value. Growth-based projection keeps the child’s current height percentile into adulthood.
Frequently asked questions
How accurate is the mid-parental height?
About 95% of children end up within 8.5 cm (3.3 inches) of the prediction.
Do boys or girls grow taller than their parents?
The 13 cm difference reflects the average difference in height between men and women.
What affects adult height?
Genes are most important, plus nutrition, sleep, health and the timing of puberty.
How tall will a boy be if his mother is 163 cm and his father is 177 cm?
Predicted adult height: 177 cm (Average · 177 cm). Using the mid-parental method, a boy with these parents is likely to reach about 177 cm, most likely between 168 cm and 185 cm. Enter your own numbers above for a personal result.
Sources and references
Written and checked by the MediHub editorial team against the sources above. Read how we build and review our calculators.
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Last updated . This calculator is for education only and is not medical advice. See the medical disclaimer.