📏 Child Height Predictor

Estimate a child's adult height from parents' heights using mid-parental height formula and current measurements.

Parent Heights

Predicted Adult Height
—
Predicted Range
—
In Centimeters
—
Mid-Parental Height
—
Percentile (est.)
—

Mid-Parental Height Method

The most widely used formula for predicting adult height from parental heights:

Boys: (Father's height + Mother's height + 5 inches) / 2
Girls: (Father's height + Mother's height − 5 inches) / 2

Predicted range: ± 4 inches (±10 cm) of result

Other Factors That Influence Height

  • Nutrition: Adequate protein, calcium, and vitamin D during growth years
  • Sleep: Growth hormone is primarily released during deep sleep
  • Exercise: Weight-bearing activities stimulate bone density
  • Health: Chronic illness or certain medications can affect growth
  • Genetics: Parental height accounts for ~80% of adult height variation
How accurate is height prediction? +
The mid-parental height formula is accurate within ±4 inches (10 cm) for about 95% of children. No formula can precisely predict adult height — genetics is complex and environmental factors play a significant role. Pediatricians also use growth charts and bone age X-rays for more individualized assessments.
At what age do children stop growing? +
Girls typically stop growing 1–2 years after their first menstrual period, usually between 14–16. Boys continue growing until around 16–18 years old. However, some individuals may grow slightly into their early 20s. The growth plates (epiphyseal plates) close when growth is complete.