Height
Predictor
Forecasting adult stature using linear regression and mid-parental target heights. Calibrated for stature tracking and anthropometric conversion.
Stature Baseline
Genetic Variance
Adult height is ~60-80% determined by genetics. Environmental factors like nutrition and sleep quality during puberty significantly impact final stature.
Mean Regression
Statistically, children of very tall or short parents tend to "regress toward the mean," becoming closer to average height than their parents.
Calculated Projection
At age 5, the model evaluates current stature against genetic ceilings.
Height Comparison
Height Mechanics
A specialized manual for predicting adult stature, genetic potential, and adolescent growth trajectories.
What Is a Height Calculator, Really?
A height calculator answers the question that parents, pediatricians, and curious teens ask: "Given a child’s age, sex, current height, and the parents’ heights, how tall will the child likely be as an adult?"
Height is influenced by genetics (about 60‑80%) and environmental factors (nutrition, health, sleep). No calculator can predict with absolute certainty, but several well‑researched methods give a reasonable estimate.
Pro Tip: The most accurate way to predict height is to track your child’s growth on a pediatric growth chart. A child who has consistently been in the 75th percentile for height is likely to stay near that percentile as an adult.
Method 1: Mid‑Parental Height (Genetics)
This method averages the parents’ heights, adjusting for sex.
(Dad + Mom + 5") / 2
(Dad + Mom - 5") / 2
Method 2: Khamis‑Roche (Developmental)
Developed by pediatric researchers, this uses child’s age, sex, height, and weight to predict adult height. It doesn’t require parental heights. Correctly implemented, it's validated for children aged 4‑17.
"For the best prediction, use the Khamis‑Roche method between ages 4 and 12."
Average CDC 50th Percentile Stature
| Age | Boys (50th) | Girls (50th) |
|---|---|---|
| 2 yrs | 34.5" | 34.0" |
| 5 yrs | 43.0" | 42.5" |
| 10 yrs | 55.0" | 55.0" |
| 14 yrs | 64.5" | 63.5" |
| 18 yrs | 69.5" | 64.0" |
Sleep Logic
Growth hormone is primarily released during deep sleep cycles. Children need 8‑11 hours depending on developmental age.
Genetic Ceiling
Genetics account for 60‑80% of final stature. Tall parents tend to have tall children, though regression to the mean is common.
Epiphyseal Plate Closure
Typically stop growing 2-3 years after first period.
Often continue subtle growth into early adulthood (18-20).
Determinant Coefficients
Calculative Risks
Under-2 Precision
Predictions for children under 2 are unstable. Use clinical WHO growth charts for these infants.
Sex-Specific Adjustment
Forgetting to add/subtract 5 inches (approx 6.5cm) in mid-parental models yields critical errors.
Projection Validation
Boy (Dad 6'0", Mom 5'5") → Estimate 5'11". Margin: ±2-3".
Girl (Dad 5'8", Mom 5'3") → Estimate 5'3". Margin: ±2-3".
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