Height Predictor Calculator
Estimate adult height from parent heights with a common mid-parental method.
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Result
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Formula
The model averages parent heights and applies a small gender adjustment to estimate adult height.
Worked Example
Predicting Adult Height from Parent Heights
- For boys: average both parents heights and add 2.5 inches (6.5 cm)
- For girls: average both parents heights and subtract 2.5 inches (6.5 cm)
- Actual adult height typically falls within a range of plus or minus 4 inches (10 cm) of the prediction
- Genetics account for roughly 60% to 80% of height variation. Nutrition, health, and sleep affect the remainder
This is a statistical estimate, not a medical prediction. Consult a pediatrician for growth concerns or if your child height falls outside expected percentiles.
You can also calculate changes using our Adult Height Calculator, BMI Calculator or Ideal Weight Calculator.
Frequently Asked Questions
How accurate is this height prediction?
The mid-parental method provides an estimate within a range of roughly plus or minus 4 inches. It captures genetic tendency but cannot account for nutrition, health conditions, or environmental factors that influence growth.
Which method does this calculator use?
This tool uses the mid-parental height method, which averages parent heights and adds 2.5 inches for boys or subtracts 2.5 inches for girls.
At what age does height stop increasing?
Most females reach full adult height by age 14 to 16, while most males continue growing until age 16 to 18. Some individuals may grow slightly until their early 20s.
Can nutrition change the predicted height?
Yes. Adequate nutrition, especially protein, calcium, and vitamin D during childhood, supports growth toward genetic potential. Poor nutrition can result in shorter adult height than predicted.
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I can help you understand the height predictor calculator formula, interpret your results, and answer follow-up questions.
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