Height Calculator
Predict a child's adult height from both parents' heights, or quickly convert between feet-and-inches and centimeters.
Informational only, not medical advice. Talk to a doctor.
How it works
The mid-parental method averages the parents' heights and adjusts by 13 cm (about 5 in) for the child's sex.
About two-thirds of children end up within ±8.5 cm (±3.3 in) of this estimate, which we show as the likely range.
The converter tab turns feet and inches into centimeters and back, using 1 inch = 2.54 cm exactly.
Formula
Boys: (father
Where:
- father, mother
- = Parents' adult heights in cm
- 13
- = Average height difference between men and women in cm
Worked example
Father is 180 cm (5'11"), mother is 165 cm (5'5").
Boy: (180 + 165 + 13) ÷ 2 = 179.0 cm ≈ 5 ft 10.5 in. Girl: (180 + 165 − 13) ÷ 2 = 166.0 cm ≈ 5 ft 5.5 in.
Factors Influencing Adult Height
While genetics play the most significant role in determining how tall a child will become, environmental factors are also crucial during the growing years. Adequate nutrition, particularly sufficient intake of calcium, vitamin D, and protein, provides the building blocks for bone growth and development. Furthermore, growth hormone is primarily secreted during deep sleep, making consistent rest essential for children and teenagers to reach their full genetic potential.
It is important to remember that every child follows their own unique growth curve. Some children may experience growth spurts earlier or later than their peers depending on their individual puberty timeline and hormonal changes. Pediatricians use standardized growth charts to ensure a child is growing at a consistent rate, which is often more important than their absolute height at any single point in time.
Tips for Accurate Prediction
A common mistake is using the parents' current heights without considering factors that might have stunted their own growth, such as childhood illness or historical malnutrition. For the most accurate prediction, ensure you are measuring parents correctly without shoes and standing tall against a flat surface. If there is a significant discrepancy between the parents' heights, the child's final height may be more variable and harder to predict.
Be cautious with height-increasing supplements or specialized diets marketed to parents; there is no scientific evidence that these products can override a child's genetic ceiling once their growth plates have closed. Focus on a balanced diet and regular physical activity to support healthy development. If you have concerns about a child's growth rate, consult a medical professional who can perform a clinical assessment.
Frequently asked questions
It's a rough guide. Genetics explain much of height, but nutrition, sleep, health and puberty timing also matter.
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For informational purposes only. This calculator does not provide medical advice. Consult a qualified professional before making decisions based on these results.