Predict Your Child's Adult Height
While genetics play the largest role in determining a person's final stature, predicting exact adult height is fascinating. Our Child Height Predictor uses scientifically validated formulas to estimate how tall a child will grow based on their parents' heights and current growth trajectory.
The Science of Height Prediction
Pediatricians rely on two primary mathematical models to estimate adult stature without using X-rays:
- Mid-Parental Height Formula A purely genetic calculation. It takes the mother's height and father's height, averages them, and adds 2.5 inches (for boys) or subtracts 2.5 inches (for girls). Most children will fall within 2 inches of this genetic target.
- Khamis-Roche Method A highly accurate statistical model that uses the child's current age, current height, current weight, and the parents' average height. It maps the child against vast CDC growth charts to predict the final outcome.
How to Use This Tool
- Upload or Input Data: Select your file or paste your data directly into the tool interface. Everything remains on your device.
- Configure & Process: Adjust any optional settings if necessary. The tool will process your data instantly inside your browser.
- Download Result: Preview the output and click the download or copy button to save your final results.
Frequently Asked Questions
Is the 'Double the height at age 2' myth true?
It is surprisingly accurate as a rough rule of thumb. Because boys mature slightly slower, doubling a boy's height at age 2 (or a girl's height at 18 months) often yields a number very close to their final adult height.
What factors besides genetics affect height?
While 80% of height is genetically determined, the remaining 20% is environmental. Severe childhood illness, chronic stress, and especially childhood malnutrition (lack of calcium, protein, and vitamin D) can stunt growth, preventing a child from reaching their genetic potential.
When do boys and girls stop growing?
Girls typically hit their major growth spurt right before puberty and reach their final adult height around age 14 or 15. Boys hit their growth spurt later and can continue growing slowly until age 18 or even 21.