Child Height Predictor
About Height Prediction
Genetics: ~80%
Height is primarily determined by genetics, with parents being the strongest predictor.
Environment: ~20%
Nutrition, health, and other factors account for the remaining variation.
Accuracy
Predictions have a typical margin of error of ± 2 inches (5 cm).
Average Heights
Related Calculators
Understanding Height Prediction
Methods of Prediction
Several scientific methods exist to predict a child's adult height. The most common is the mid-parental height method, which uses parents' heights as the primary predictors.
Mid-Parental Height Formula
Factors Affecting Height
Genetics (~80%)
- Parents' heights are strongest predictor
- Grandparents and family history matter
- Multiple genes involved (polygenic trait)
- Ethnicity plays a role
Environment (~20%)
- Nutrition during childhood
- Overall health and chronic illness
- Sleep quality and duration
- Physical activity levels
Growth Patterns
| Age Range | % Adult Height | Notes |
|---|---|---|
| Birth | ~30% | Average: 20 inches (50 cm) |
| Age 2 | ~50% | Common prediction point |
| Age 8-9 | ~75% | Pre-puberty growth |
| Puberty onset | ~85% | Growth spurt begins |
| End of growth | 100% | Girls: ~16, Boys: ~18 |
Prediction Accuracy
Height predictions have inherent limitations. The typical margin of error is about ±2 inches (5 cm) for mid-parental height predictions, with accuracy improving as the child gets older.
When to See a Doctor
Growth Concerns
If your child falls below the 3rd percentile or above the 97th percentile for their age, or if growth rate suddenly changes, consult a pediatrician.
Red Flags
- Growth has stopped or significantly slowed
- Child is much shorter than expected from parents
- Signs of early or delayed puberty
- Disproportionate growth
Supporting Healthy Growth
Nutrition
- Adequate protein intake
- Calcium and Vitamin D
- Zinc and iron
- Balanced, varied diet
Lifestyle
- 8-10 hours of sleep
- Regular physical activity
- Healthy weight maintenance
- Reduced stress
Important Note
Height predictions are estimates only. Many factors influence final adult height, and predictions become more accurate as children approach their final height. This calculator is for informational purposes only and should not replace professional medical advice.
Frequently Asked Questions
How accurate are height prediction calculators for children?
Height predictions have a typical margin of error of 2-4 inches (5-10 cm). Accuracy improves as children get older: predictions at age 2 may be off by 4 inches, while predictions at age 14+ are usually within 1 inch. The mid-parental height method is most accurate for children with average growth patterns.
What is the mid-parental height formula?
The mid-parental height method uses parents' heights to predict a child's adult height. For boys: (father's height + mother's height + 5 inches) divided by 2. For girls: (father's height + mother's height - 5 inches) divided by 2. The 5-inch adjustment accounts for the average height difference between sexes.
Can nutrition affect a child's final adult height?
Yes, while genetics determine about 80% of adult height, nutrition accounts for much of the remaining 20%. Adequate protein, calcium, vitamin D, and zinc during childhood are essential for reaching genetic height potential. Malnutrition or chronic illness during growth years can result in shorter adult height.
When should I be concerned about my child's growth?
Consult a pediatrician if your child falls below the 3rd percentile or above the 97th percentile for age, if growth suddenly slows or stops, if there are signs of early or delayed puberty, or if predicted height differs significantly from genetic potential. A bone age X-ray can provide more accurate growth assessment.