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Child Adult Height Predictor

Predict a child's future adult height using the Mid-Parental method and genetic potential ranges. Includes growth channel projections based on parental stature.

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About

Pediatricians use the Mid-Parental Height method to estimate the genetic target range for a child. This calculation assumes that an individual's growth trajectory largely follows the biological inheritance from both parents. Environmental factors like nutrition and health status cause deviations from this genetic mean. The result provides a target window of plus or minus two standard deviations rather than a single absolute number. Monitoring a child's growth curve against this genetic prediction helps identify potential endocrine issues or nutritional deficits early. Accuracy improves when the biological parents are of average stature.

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Formulas

The Tanner method, also known as the Mid-Parental Height calculation, averages the parents' heights and adds a constant for sexual dimorphism.

Hchild = Hfather + Hmother + C2

The constant C depends on the biological sex of the child.

{
C = 13 for BoysC = −13 for Girls

Reference Data

FactorBoys FormulaGirls Formula
Base(Hdad + Hmom) ÷ 2(Hdad + Hmom) ÷ 2
Adjustment+ 6.5 cm− 6.5 cm
Variation Range± 10 cm± 9 cm
Growth Stop (Avg)18 years16 years
Accuracy Rate95% within range95% within range
Khamis-RocheRequires WeightRequires Weight
Bone AgeX-Ray RequiredX-Ray Required
Hormonal ImpactTestosteroneEstrogen

Frequently Asked Questions

The Mid-Parental method predicts final adult height based on genetics, not the speed of growth. A child with constitutional growth delay will likely reach the predicted target later than peers.
The calculator assumes parents reached their genetic potential. If a parent's growth was stunted by environmental factors, the child may exceed the predicted height if raised in a better environment.
This range represents approximately two standard deviations. Statistically, 95% of children fall within this window of their target height, assuming no pathological growth disorders.
13 cm represents the average difference in adult height between males and females in the general population. Adding or subtracting this value normalizes the parents' heights to the child's sex.