The Science of Height Prediction
How tall will your child be? While no crystal ball exists, science gives us the Mid-Parental Method (also known as the Tanner Method).
Height is estimated to be roughly 80% genetic. This formula takes the average of both parents' height and adjusts for the biological sex difference (adding inches for boys, subtracting for girls).
The "Genetic Window"
Most children will reach a final height within 2 inches (5 cm) of this target. Environmental factors like nutrition, sleep, and overall health determine whether they land at the top or bottom of this range.
When Do Kids Stop Growing?
Girls
Girls typically have their growth spurt earlier. Most reach their full adult height about 2 years after their first period (menarche), usually stopping around age 14 or 15.
Boys
Boys are often "late bloomers." They begin their growth spurt later and continue growing for longer, typically stopping between ages 16 and 18, though some continue into their early 20s.
Frequently Asked Questions
Can I increase my child's height?
My son is short for his age. Will he catch up?
Is this 100% accurate?
Tools & Data Verified by the EverydayCalculators Medical Research Team.
Last updated: January 2026.