Child Height Predictor Calculator (Khamis-Roche Method)

How the Khamis-Roche Height Prediction Method Works

This calculator uses the Khamis-Roche method to predict a child’s adult height based on their current height, weight, and parent heights. The method was developed by Khamis and Roche (1994) and uses age-specific regression equations to estimate final adult stature.

The formula combines four factors: the child’s current height, current weight, mid-parental height (average of both parents), and age-specific coefficients. The method is most accurate for children ages 4 to 17.5 years. For children under 4, a simplified mid-parent rule is used.

What Factors Affect Predicted Height?

• Parent heights — Genetics is the strongest predictor of adult height
• Current height — Taller children at a given age tend to be taller adults
• Current weight — Weight has a small negative influence (heavier children may mature earlier)
• Age and gender — The regression coefficients change with age to account for growth patterns

Example Calculation

A 10-year-old boy who is 140 cm tall, weighs 35 kg, with a mother 165 cm and father 178 cm tall would have a predicted adult height of approximately 181 cm (5 ft 11 in).

Frequently Asked Questions

How accurate is the Khamis-Roche method?

The Khamis-Roche method has a standard error of about 2.2 inches (5.6 cm) for boys and 1.7 inches (4.3 cm) for girls. It is considered one of the most accurate non-invasive height prediction methods available.

What age range does this calculator work for?

The Khamis-Roche regression equations cover ages 4 to 17.5 years. For children ages 2-4, the calculator uses a simplified mid-parent rule that considers only parent heights and gender.

Does this method account for early or late puberty?

The Khamis-Roche method does not require bone age or pubertal status information, which makes it easier to use but may be less accurate for children who are early or late maturers. For more precise predictions in those cases, a bone age assessment by a physician may be helpful.

Can I use this for both boys and girls?

Yes, the calculator uses separate regression coefficients for boys and girls, accounting for the different growth patterns and average adult heights between genders.