How to Predict Your Child's Adult Height
A child's expected adult height is strongly linked to genetics. This calculator uses the mid-parental height (MPH) formula, widely used in pediatric endocrinology. For boys: (father's height + mother's height + 13) / 2 in cm; for girls: (father's height + mother's height - 13) / 2 in cm. Most children's actual adult height falls within about 3.3 inches (8.5 cm) of this prediction.
Why show a range instead of one number?
Genetics account for roughly 70-80% of adult height, while nutrition, sleep quality, illness, and activity level shape the rest. That's why a range is more realistic than a single fixed number. If your child is noticeably shorter or taller than peers during growth, this range can help you judge whether it's worth checking in with a pediatrician.
Remember this is a reference estimate
This formula is a statistical approximation and is less precise than clinical growth-plate or bone-age assessments. If you need a more accurate prediction, ask your pediatrician about a bone age X-ray.
Frequently Asked Questions
The MPH formula reflects a statistical tendency. Genetics account for roughly 70-80% of adult height, with the rest shaped by nutrition, sleep, and activity — so the actual result can fall anywhere within the ±3.3 in range shown.
Getting enough sleep, balanced nutrition (protein and calcium), and regular exercise before growth plates close can help a child reach the top of their genetic potential.