How tall will they be?
Predict adult height from genetics + growth trajectory
Medical Disclaimer: This tool provides general educational estimates. Always consult your prescribing physician or healthcare provider before making medication changes or interpreting results from population-based models.
Frequently Asked Questions
Mid-parental height predictions are accurate within +/- 5 cm (2 inches) for most children. Accuracy improves after age 4.
Genetics (60-80%), nutrition, sleep, hormones, and overall health. Mid-parental height captures the genetic component.
Girls typically stop at 14-16, boys at 16-18. Growth plates close when epiphyseal fusion is complete.
Methodology
This calculator uses the mid-parental height method combined with growth trajectory analysis. For boys: mid-parental height = (mother's height + father's height) / 2 + 6.5 cm. For girls: mid-parental height = (mother's height + father's height) / 2 - 6.5 cm. After age 4, the child's current growth percentile is factored in to adjust the prediction. Predictions are accurate within +/- 5 cm for most children.
Adult height prediction uses mid-parental height (average of parents' heights +/- 6.5 cm for sex) combined with the child's current growth trajectory. Genetics account for 60-80% of adult height. The Tanner method adds 6.5 cm for boys or subtracts 6.5 cm for girls from the average of parents' heights. Predictions are accurate within +/- 5 cm for most children over age 4.
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