Mr Calcu | See how tall your child could grow—powered by science, designed for peace of mind.

Predict and understand your child's future height with our expert-backed calculator. Empower your parenting with accurate insights and confident planning.

Predict Your Child's Adult Height

Metric

Imperial

Child's Age (years)

Child's Height (cm)

Mother's Height (cm)

Father's Height (cm)

Child's Gender

Child's Weight (optional) (kg)

Child Height Predictor Guidelines

It's quick and easy to start—just follow these steps!

Step 1: Enter the child’s age, height, and gender
Step 2: Input both parents' heights
Step 3: (Optional) Add the child’s current weight for more accurate predictions using Khamis-Roche
Step 4: Choose your preferred method (Khamis-Roche or Mid-Parent)
Note: For children under 4 years old, Khamis-Roche is not applicable — use the Mid-Parent Method instead
Important: For children with medical conditions or abnormal growth patterns, consult a healthcare professional

Child Height Predictor Description

Understanding Child Height Prediction

Child height prediction combines genetic and physical measurements with statistical models to estimate adult height. The two most widely used methods are:

Mid-Parent Method

Based on average parental heights
Quick estimation without needing child’s current weight
Formulas:

For boys: (Mother's height + Father's height + 13) / 2
For girls: (Mother's height + Father's height - 13) / 2

Khamis-Roche Method

Uses current child’s height, weight, age, and parental height
Validated for children aged 4–17
Does not require bone age
Formula structure:

Predicted Adult Height = a + b1*(Child's Height) + b2*(Child's Weight) + b3*(Mid-parent Height)

Coefficient values (a, b1, b2, b3) vary with age and gender, sourced from clinical studies.

Influencing Factors

Genetics: Account for 60–80% of height outcomes
Nutrition: Essential for reaching full potential
Puberty: Early or delayed onset impacts growth patterns
Health: Chronic illnesses and hormonal disorders can alter expected growth

Edge Case Considerations

Early Puberty: May inflate short-term predictions
Obesity or Underweight: Disrupts weight-based formulas
Significant Height Difference in Parents: May cause regression inaccuracies
Growth Conditions: Results should be reviewed by a pediatrician
Ethnic Variability: Model may be less accurate for non-U.S. populations

Pro Tip: Use the Khamis-Roche method if your child is between 4–17 years old and you have their current weight — it's more accurate than the Mid-Parent Method.

Case Study Examples

1. High Parental Height Discrepancy

Child: 11-year-old male, 145 cm, 42 kg
Mother: 152 cm | Father: 192 cm
Mid-Parent Estimate: 178.5 cm
Khamis-Roche Prediction: ~180.3 cm

→ Khamis-Roche accounts for the child's growth percentile, giving a refined result.

2. Early Puberty Case

Child: 9-year-old female, 144 cm, 47 kg
Parents: 165 cm & 175 cm
Mid-Parent Estimate: 163.5 cm
Khamis-Roche Prediction: ~165.8 cm

→ Early growth spurts may mislead; predictions should be paired with clinical monitoring.

Get started now and discover your child's growth path with clarity and confidence!

Example Calculation

Child's Age	Child's Height	Child's Weight	Mother's Height	Father's Height	Method	Predicted Adult Height
10	140 cm	35 kg	165 cm	180 cm	Khamis-Roche	174.2 cm
12	150 cm	44 kg	160 cm	185 cm	Khamis-Roche	178.6 cm
8	130 cm	28 kg	158 cm	170 cm	Mid-Parent	161.5 cm
11	145 cm	38 kg	152 cm	192 cm	Khamis-Roche	180.3 cm
9	144 cm	47 kg	165 cm	175 cm	Khamis-Roche	165.8 cm

Frequently Asked Questions

The accuracy varies by method. The Khamis-Roche method offers ~90% accuracy within ±5 cm when appropriate data is used. However, growth conditions, puberty timing, and genetics all affect final height.

It is a statistical model that predicts adult height using the child's current height, weight, and mid-parental height. It does not require skeletal age and is validated for ages 4 to 17.

Yes, especially in early childhood and puberty. Chronic undernutrition can delay growth spurts and reduce final height.

Outliers may lead to less accurate predictions. Use percentile growth charts and consider endocrinology evaluation for further assessment.

They were derived from U.S. population data and may not fully capture global variability. Some ethnic groups may mature at different rates.

Yes. Despite similar genetics, intrauterine conditions, nutrition, and early health differences can lead to variations.

Pediatricians often use bone age X-rays and growth percentile charts along with prediction models like Khamis-Roche or Mid-Parent methods for a more clinical estimate.

Mr Calcu | See how tall your child could grow—powered by science, designed for peace of mind.

Predict Your Child's Adult Height

Child Height Predictor Guidelines

Child Height Predictor Description

Understanding Child Height Prediction

Mid-Parent Method

Khamis-Roche Method

Influencing Factors

Edge Case Considerations

Case Study Examples

1. High Parental Height Discrepancy

2. Early Puberty Case

Example Calculation

Frequently Asked Questions

How accurate is the child height predictor?

What is the Khamis-Roche Method?

Can nutrition affect height prediction?

What if my child is unusually tall/short for their age?

Are these models valid for all ethnic backgrounds?

Can twins or siblings have different predicted heights?

How do doctors predict a child's adult height?

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