Mid-Parental Height Calculator

The Mid-Parental Height Calculator estimates a child's expected adult height based on the biological parents' heights and the child's sex. This tool provides parents with reference data and pediatricians anticipate growth patterns and assess genetic potential. Whether you are tracking developmental milestones, evaluating growth concerns, or simply curious about future height, this calculator provides a scientifically grounded projection.

Biological sex used for height adjustment.
Biological father's height in centimeters (cm).
Biological mother's height in centimeters (cm).

How Predicted Adult Height Is Calculated

Predicted adult height is calculated using the mid-parental height method, a standard formula used in pediatrics. This method estimates a child's genetic potential by averaging the parents' heights and adjusting for the child's sex.

Target Height = (Father’s Height + Mother’s Height ± 13 cm) / 2

Where:

  • For Boys, add 13 cm before dividing by 2.
  • For Girls, subtract 13 cm before dividing by 2.
  • The final result represents the 50th percentile projection.

The resulting target height provides a central estimate. To account for natural genetic variation, a target range of plus or minus 8.5 cm (approximately 3.3 inches) is typically added. This range encompasses the majority of potential outcomes based on parental genetics.

What Your Predicted Adult Height Means

The predicted height represents the midpoint of your child's potential growth range based on genetics. It is useful for tracking progress against standard growth curves.

Pro Tip

Compare this prediction with your child's current growth percentile on their pediatric chart. If they are consistently tracking along a specific curve, they will likely reach a height close to that percentile rather than the estimated mid-parental target.

Tracking Development: If your child's current height is near the 50th percentile, they are likely to reach the predicted height. If they are consistently above the 90th percentile, they may exceed the prediction.

Evaluating Concerns: A significant deviation from the predicted range (e.g., a child with tall parents who is consistently falling below the 5th percentile) may warrant a discussion with a pediatrician to rule out underlying health issues.

Disclaimer: This calculator provides an estimate based on genetic averages and is not a definitive screening assessment of adult height. Factors such as nutrition, chronic illness, and hormonal imbalances can significantly impact final height. Consult a healthcare provider for professional medical advice regarding growth and development.

Calculation logic verified using publicly available standards.

View our Accuracy & Reliability Framework →