What ages work with Khamis-Roche?

The Khamis-Roche method works for children aged 4 to 17.5 years. It uses current height, weight, and parent heights to predict adult stature using regression coefficients derived from longitudinal growth studies.

What factors affect adult height?

Genetics account for about 60-80% of height variation. Nutrition, sleep, physical activity, and overall health during childhood also play significant roles. Chronic illness or malnutrition can reduce final adult height.

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Child Height Predictor

Predict your child's adult height using the mid-parental or Khamis-Roche method. Enter parent heights and child measurements for an estimated adult height.

Last updated: April 1, 2026

Sex

Units

Mother's Height

Father's Height

How to Use This Calculator

Select the prediction method: Mid-Parental (parents only) or Khamis-Roche (includes child data).
Choose your child's sex and preferred units (metric or imperial).
Enter both parents' heights.
For Khamis-Roche, also enter the child's current age, height, and weight.
Click Predict Height to see the estimated adult height range and percentile.

The Formula

Mid-Parental (boy): (Mother's height + 13cm + Father's height) / 2 ± 8.5cm. Mid-Parental (girl): (Father's height - 13cm + Mother's height) / 2 ± 8.5cm. Khamis-Roche uses regression coefficients based on age, height, weight, and parent heights.

Frequently Asked Questions

The mid-parental method gives a rough estimate within about ±8.5 cm (3.3 inches). It's a simple calculation that only considers genetics through parent heights. The Khamis-Roche method is more accurate when child measurements are available.