Height Calculator - Calculator See


Height Calculator

Predict child adult height using the clinical Khamis-Roche mid-parental method, or convert height between feet, inches, centimeters, and meters.

Calculator Inputs

Used for sex-adjusted growth curves.
yrs
Current age.
in
Current measured standing height.
in
Biological mother height (5 ft 4 in = 64 in).
in
Biological father height (5 ft 10 in = 70 in).

Calculated Results

Predicted Adult Height
5 ft 10 in (177.8 cm)
Mid-Parental Target 5 ft 9.5 in
Growth Remaining +20.0 inches
Normal Range (±2 in) 5 ft 8 in – 6 ft 0 in
Values calculate live as you adjust inputs.

About Height Calculator

The Height Calculator predicts a child's adult stature based on the validated Mid-Parental Height (Tanner / Khamis-Roche) formula, incorporating parental genetic potential and sexual dimorphic growth adjustments.

What is Height Calculator?

The Height Calculator predicts a child's adult stature based on the validated Mid-Parental Height (Tanner / Khamis-Roche) formula, incorporating parental genetic potential and sexual dimorphic growth adjustments.

How to Use This Calculator

  1. Select the child's biological sex and current age.
  2. Enter the child's current measured height in inches.
  3. Input both biological mother and father heights in total inches (or feet and inches).
  4. Review predicted final adult height and projected normal growth band.

The Mathematical Formula & Variables

Boys: (Father Height + Mother Height + 5 inches) / 2; Girls: (Father Height + Mother Height - 5 inches) / 2

Step-by-Step Worked Example

Scenario: Predicting an 8-year-old boy's adult height with a 64-inch mother (5'4") and 70-inch father (5'10").

  1. Sum parental heights: 70 + 64 = 134 inches.
  2. Add male sex differential of 5 inches: 134 + 5 = 139 inches.
  3. Divide by 2: 139 / 2 = 69.5 inches = 5 ft 9.5 in (176.5 cm).

Result: Predicted Height: 5 ft 9.5 in to 5 ft 10 in (177.8 cm)

Frequently Asked Questions

How accurate is the mid-parental height formula?

The mid-parental formula predicts adult height within ±2 inches (5 cm) for approximately 68% of healthy children, and within ±4 inches for 95% of children without endocrine disorders.

How do I convert feet and inches into total inches?

Multiply feet by 12 and add the inches. For example, 5 feet 10 inches = (5 * 12) + 10 = 70 inches.