How accurate is the height prediction?

The mid-parental method predicts within ±4 inches (10 cm). The Khamis-Roche method is generally more accurate for children aged 4-9.

Can nutrition affect height?

Yes! Proper nutrition, especially protein, calcium, and vitamins D and A, is crucial for reaching your genetic height potential.

How do I convert cm to feet and inches?

Divide cm by 2.54 to get inches, then divide by 12 for feet. Our built-in converter handles this automatically.

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CALCULATOR

Height Calculator

Q: At what age do children stop growing?

Girls typically stop by age 15, boys by age 18, though some individuals may grow slightly into their early 20s.

Child's Information

Child's Age (years)

Gender

Boy

Child's Height (cm)

Child's Weight (kg)

Parents' Heights

Mother's Height (cm)

Father's Height (cm)

Height Calculator: Predict Your Child's Adult Height

Wondering how tall your child will be? Our Height Calculator uses scientifically-backed methods, including the Khamis-Roche method and the mid-parental height formula, to provide a reliable estimate of a child's predicted adult height. Simply enter the child's current measurements along with both parents' heights to get an instant prediction.

Height prediction is a complex science influenced by both genetics (60–80%) and environmental factors. While no calculator can guarantee exact results, methods based on parental height statistics and growth chart data offer surprisingly good estimates for healthy children.

This guide explores the biology of growth, the science behind height prediction, and practical tips for parents who want to ensure their children reach their full growth potential.

How Height Prediction Works

The Mid-Parental Height Method is one of the most commonly used approaches. For boys, it averages both parents' heights and adds 2.5 inches (6.5 cm). For girls, it subtracts 2.5 inches. This gives a rough estimate within a 4-inch range.

The Khamis-Roche Method is considered one of the most accurate methods that do not require bone age measurement. It uses the child's current stature, weight, and the average height of both parents to predict adult height. It is most applicable to children between ages 4 and 9.

More advanced clinical methods, such as bone age analysis using wrist X-rays (Greulich-Pyle method), are used in medical settings for greater accuracy, especially when growth disorders are suspected.

How to Use the Height Prediction Calculator

Step 1: Enter Child's Age: Input the child's current age in years.
Step 2: Select Gender: Choose boy or girl, as growth timelines differ.
Step 3: Enter Child's Height & Weight: Provide current measurements in cm or inches.
Step 4: Enter Parents' Heights: Input both mother's and father's height.
Step 5: Calculate: The tool instantly predicts adult height using the Khamis-Roche method and the mid-parental formula.

Height Prediction Formulas

Mid-Parental (Boy)

Predicted Height = (Mother's Height + Father's Height + 13 cm) / 2

A quick estimate for boys based on the average of both parents' heights plus a 13 cm offset.

Mid-Parental (Girl)

Predicted Height = (Father's Height + Mother's Height − 13 cm) / 2

A quick estimate for girls based on the average of both parents' heights minus 13 cm.

CDC Growth Chart Percentile

Based on current height percentile maintained through adulthood

Children generally remain near the same growth percentile, so current position on the chart can predict adult height.

Example Height Predictions

Mother	Father	Child Gender	Predicted Adult Height
160 cm	175 cm	Boy	~174 cm (5'8.5")
160 cm	175 cm	Girl	~161 cm (5'3.5")
170 cm	185 cm	Boy	~184 cm (6'0.5")
155 cm	170 cm	Girl	~156 cm (5'1.5")

Benefits of Our Height Calculator

✓
Multiple Methods
Get predictions from both the Khamis-Roche method and the mid-parental formula for comparison.
✓
Height Converter Built-In
Easily convert between feet/inches and centimeters with the integrated converter.
✓
Instant Results
No registration required – get predictions immediately on any device.
✓
Educational Content
Learn about growth science, puberty timelines, and factors that influence final height.

Frequently Asked Questions About Height

At what age do children stop growing?

Girls typically stop growing by age 15, while boys continue until about age 18. However, some individuals may grow slightly until their early 20s.

Can a child be taller than both parents?

Yes! While genetics play a major role, nutrition, health, and other environmental factors can result in a child exceeding both parents' heights.

How accurate is the mid-parental height formula?

It typically predicts within a range of ±4 inches (10 cm). The Khamis-Roche method is generally more accurate.

Does exercise make you taller?

Exercise supports growth but doesn't increase your genetic height potential. However, it ensures you reach your full potential by promoting bone health.