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👶 Baby & Child Health

Child Height Predictor

Predict your child's adult height based on parents' heights using the mid-parental height method. Based on Tanner and WHO growth standards.[reference:43][reference:44]

Select your child's biological sex
Biological father's height
Biological mother's height

Understanding Child Height Prediction

What Is the Mid-Parental Height Method?

The mid-parental height (MPH) method is a simple, evidence-based way to estimate a child's adult height potential based on the parents' heights. The method was developed by Tanner and colleagues in 1970 and remains widely used in pediatric practice[reference:51].

The calculations are:

  • For boys: Target height = ((Mother's height + 13 cm) + Father's height) ÷ 2[reference:52]
  • For girls: Target height = ((Father's height − 13 cm) + Mother's height) ÷ 2[reference:53]
  • 13 cm (5.12 inches) is the average difference in height between men and women[reference:54]

In inches, the formulas are[reference:55]:

  • For boys: ((Mother's height + 5 inches) + Father's height) ÷ 2
  • For girls: ((Father's height − 5 inches) + Mother's height) ÷ 2

How Accurate Is the Prediction?

Approximately 95% of children will reach an adult height within ±4 inches (10.2 cm) of the predicted target height[reference:56][reference:57]. This means:

  • 1 standard deviation (SD) = 2 inches (5.1 cm)[reference:58]
  • 2 SD = 4 inches (10.2 cm) — the 95% confidence interval[reference:59]
  • Many clinicians round to 5 cm per SD or 10 cm for 2 SD[reference:60]

Factors Affecting Adult Height

While genetics determine approximately 60-80% of adult height, other factors also play important roles:

  • Nutrition: Adequate protein, calcium, vitamin D, and overall calories support optimal growth.
  • Health: Chronic illness or conditions can affect growth.
  • Physical activity: Regular exercise supports healthy bone development.
  • Sleep: Growth hormone is primarily released during deep sleep.
  • Environment: Socioeconomic factors and stress can influence growth.

💡 Clinical Note: The mid-parental height method provides a population-based estimate. For an individual child, the predicted adult height may vary. The Tanner method (which uses bone age from X-ray) provides a more precise prediction for individual children but requires medical imaging[reference:61].

When to Consult a Pediatrician

  • If your child's height is consistently below the 5th percentile on growth charts.
  • If your child's height is consistently above the 95th percentile.
  • If your child's growth velocity is significantly slower or faster than expected.
  • If you have concerns about your child's growth or development.

References & Further Reading

  • Tanner, J.M., Goldstein, H., & Whitehouse, R.H. (1970). Standards for children's height at ages 2-9 years allowing for heights of parents. Archives of Disease in Childhood, 45(244), 755-762.[reference:62]
  • American Academy of Pediatrics. (2020). Growth and Development: Mid-Parental Height.
  • WHO Child Growth Standards. (2006). Length/height-for-age, weight-for-age, weight-for-length, weight-for-height and body mass index-for-age.

Frequently Asked Questions

The mid-parental height (MPH) method is a simple way to estimate a child's adult height potential based on the parents' heights[reference:63]:

  • For boys: ((Mother's height + 13 cm) + Father's height) ÷ 2
  • For girls: ((Father's height − 13 cm) + Mother's height) ÷ 2

95% of children will reach an adult height within ±4 inches (10.2 cm) of this calculation[reference:64].

The mid-parental height method is a population-based estimate. Approximately 95% of children will have an adult height within ±4 inches (10.2 cm) of the predicted target height[reference:65][reference:66]. Individual variation is significant, and factors like nutrition, health, and environment also influence final adult height.

The Tanner method, developed by James Tanner in 1970, is another approach to predicting adult height[reference:67]. It uses the child's current height, weight, and bone age (determined by X-ray of the hand and wrist). The mid-parental height method is simpler and does not require bone age assessment, making it more accessible for general use.

A normal height percentile is typically between the 5th and 95th percentiles on WHO or CDC growth charts. The 50th percentile represents the average height for a child's age and sex. Children consistently below the 5th percentile or above the 95th percentile may be evaluated for growth concerns.

Adult height is influenced by:

  • Genetics: Approximately 60-80% of height is determined by genetics.
  • Nutrition: Adequate protein, calcium, and vitamins are essential.
  • Health: Chronic illness can affect growth.
  • Physical activity: Supports bone health and growth.
  • Sleep: Growth hormone is released during deep sleep.

The mid-parental height method estimates the genetic potential, but environmental factors can modify the final outcome.

The formulas use different adjustments for cm and inches:

  • In cm: Add or subtract 13 cm (the average height difference between men and women)[reference:68].
  • In inches: Add or subtract 5 inches (approximately 12.7 cm)[reference:69].

Both methods yield the same result — the difference is due to rounding in the conversion between units.

The mid-parental height method requires both parents' heights. If only one parent's height is known, the prediction will be less accurate. In such cases, population averages can be used as an approximation, but this significantly reduces the accuracy of the prediction.

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