Height Predictor (Child)

The Formula

The Mid-Parental Height formula estimates adult height based on parental averages, adjusted for gender.

Variable Definitions

How to Use This Calculator

1. 1

   Enter both parents' heights in feet and inches using the input fields.

2. 2

   Select the child's gender (Male or Female) from the dropdown menu.

3. 3

   View the predicted adult height, expected range, and metric conversion.

The Mid-Parental Height formula estimates adult height from parental heights, with a ±2 inch range.

Understanding the Concept

This calculator uses the Mid-Parental Height method (also known as the Tanner method). It provides only a rough estimate — actual adult height is influenced by nutrition, genetics, sleep, and environmental factors. Consult a pediatrician for medical concerns. Practical example: a father is 5 feet 10 inches (70 inches) and a mother is 5 feet 4 inches (64 inches). For a son: (70 + 64 + 13) / 2 = 73.5 inches, or about 6 feet 1.5 inches, with an expected range of 71.5 to 75.5 inches (about 6 feet to 6 feet 3.5 inches). For a daughter: (70 + 64 - 13) / 2 = 60.5 inches, or about 5 feet 0.5 inches, with a range of 58.5 to 62.5 inches. Edge cases: the method assumes both biological parents are of average genetic background — it does not account for ethnic differences in average height distribution. For adopted children or cases where one biological parent's height is unknown, the method cannot provide a meaningful estimate. If either parent has a condition that significantly affected their own growth (such as childhood malnutrition or a growth hormone disorder), the prediction will be less accurate. The ±2 inch range covers about 68% of children, meaning roughly one in three children will fall outside this range. Note also that puberty timing significantly affects growth — early maturers may reach their predicted height sooner but not necessarily taller.

Frequently Asked Questions

Sources & References