Child Height Predictor
About Child Height Predictor
Predicting Your Child's Adult Height
Parents are naturally curious about how tall their children will grow. While genetics play the dominant role in determining adult height (accounting for 60-80% of height variation), environmental factors like nutrition, sleep, and overall health also contribute. The mid-parental height method provides a scientifically validated estimate based on the heights of both biological parents. This method has been used by pediatric endocrinologists for decades as a quick screening tool.
The Mid-Parental Height Formula
For boys: Predicted height = (Father's height + Mother's height + 13 cm) / 2. For girls: Predicted height = (Father's height + Mother's height - 13 cm) / 2. The 13 cm (5 inches) adjustment accounts for the average height difference between adult males and females. The prediction has a margin of error of approximately plus or minus 10 cm (4 inches), reflecting the natural variation in genetic expression.
How to Use This Calculator
Enter both parents' heights and the child's sex. The calculator provides the predicted adult height along with a likely range (plus or minus the standard error). It also shows the height percentile relative to the general population and compares the prediction against average adult heights for reference.
Frequently Asked Questions
How accurate is this prediction?
The mid-parental method is accurate within about 4 inches (10 cm) for most children. Actual height may fall outside this range due to nutrition, health conditions, or genetic variations from more distant relatives.
What factors besides genetics affect height?
Nutrition (especially protein and calcium), sleep quality, chronic illness, hormonal conditions, and socioeconomic factors all influence final height. Adequate nutrition and health during growth years help children reach their genetic potential.
At what age do children stop growing?
Girls typically reach adult height by age 14-16. Boys continue growing until 16-18, sometimes into their early twenties. Growth plate closure determines when height growth stops.
