Child Height Predictor
Predict a child's adult height from parents' heights using the mid-parental height method.
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How to use this calculator
Mid-parental height adds 13 cm to the mother's height for boys (or subtracts 13 cm for girls) before averaging with the father's height. 95% of children fall within 10 cm of this prediction.
- 1
Enter both parents' heights in centimetres.
- 2
Select the child's sex.
- 3
Optionally enter the child's current height and age to see a height comparison.
- 4
Read the predicted adult height and the ±5 cm range.
Frequently asked questions
How accurate is the mid-parental height prediction?
The mid-parental height formula is a clinical guideline, not a precise prediction. About 95% of children will reach an adult height within 10 cm (±5 cm) of the predicted value. Factors like nutrition, health, sleep, and physical activity during childhood also affect final height.
At what age do girls and boys stop growing?
Girls typically stop growing around 14–16 years of age (1–2 years after their menstrual cycle begins). Boys generally stop growing between 17–18 years. Final height can be reached a little earlier or later depending on puberty timing.
Can I increase my child's predicted height?
Genetics accounts for about 80% of height. The remaining 20% is influenced by nutrition (adequate protein, calcium, vitamin D), quality sleep (growth hormone is released at night), and avoiding chronic illness during key growth periods.
Child Height Predictor — Mid-Parental Height Calculator
The Mid-Parental Height Method
The mid-parental height formula is widely used by paediatricians to estimate a child's genetic height potential. For boys: (father's height + mother's height + 13 cm) / 2. For girls: (father's height + mother's height − 13 cm) / 2. The 13 cm adjustment accounts for the average height difference between adult males and females.
Understanding the ±5 cm Range
The ±5 cm range (10 cm total) captures approximately 95% of children with the given parental heights. A child outside this range should be evaluated by a paediatrician for growth concerns, as it may indicate nutritional, hormonal, or genetic factors affecting growth.
Other Factors That Influence Height
Adequate nutrition in the first 2 years of life is especially critical for height. Sleep quality matters because 70–80% of human growth hormone is secreted during deep sleep. Chronic illness, certain medications (including long-term corticosteroids), and thyroid or growth hormone disorders can all limit height.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →