Height Predictor & Calculator

Estimate a child's final adult height based on parental genetics and current growth measurements.

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Select the child's gender, enter their current age and height, and input both parents' heights below to run the prediction.

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A Guide to Predicting and Estimating Heights

Predicting a child's future adult height is a common interest for parents and pediatricians. While there is no way to know the exact final height with absolute certainty, mathematical models can provide highly reliable estimations based on parental genetics and early childhood growth milestones. Height prediction models help track healthy development patterns, identify potential growth hormone concerns early, and plan for athletic training or gear sizes.

Methods of Height Prediction

The two most common scientific methods for estimating future height are the Mid-Parental Height formula and the Growth Chart Percentile method.

The Mid-Parental method uses genetics as the primary driver. For a boy, you find the average of the parents' heights and add 2.5 inches (or 6.5 cm). For a girl, you average the parental heights and subtract 2.5 inches. To calculate these averages easily, check out our simple group averages tool.

The Growth Chart method assumes a child will follow their current percentile curve (e.g. 50th percentile) as they grow to maturity. To convert between feet, inches, and centimeters, use our translating measuring units tool.

Genetics and Growth Factors

Genetic Contribution: Studies show that genetics account for roughly 60% to 80% of a person's final adult height, which you can check with our standard daily math helper.
Environmental Influences: Nutrition, sleep quality, and general health during childhood account for the remaining 20% to 40% of height potential.
Milestone Tracking: Exact age inputs are crucial for percentile curves, which you can determine with our exact age calculator tool.
Standard Deviations: Normal growth curves vary within a standard deviation, which you can round using our rounding decimals and digits tool.

Mid-Parental Formula Details

The mid-parental height formula is written as follows: for a son, mid-parental height = (father's height + mother's height + 5 inches) / 2. For a daughter, the formula is: (father's height + mother's height - 5 inches) / 2.

This calculation provides a baseline target. Most children will reach an adult height within 2 to 3 inches of this parental value. Our online tool computes these ranges, displaying both imperial and metric units.

Example of Predicting a Boy's Height

Suppose a father is 70 inches tall (5'10") and a mother is 64 inches tall (5'4"). We want to predict their son's future height.

First, add the father's and mother's heights: 70 + 64 = 134 inches. Since we are predicting for a son, we add 5 inches: 134 + 5 = 139 inches. Next, divide by 2: 139 / 2 = 69.5 inches. The son's predicted adult height is 69.5 inches, which is 5 feet 9.5 inches. The normal target range is between 5 feet 7 inches and 6 feet 0 inches. This example shows how parental heights establish genetic ranges for growth.