Use this free height calculator to predict a child's likely adult height from both parents' heights using the standard mid-parental method, or to convert a height between centimeters, inches, feet & inches, and meters. No sign-up required.
Predicted adult height
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What is a height calculator and why it matters
Parents are often curious how tall their child will grow up to be, and while genetics isn't the only factor, a child's height is strongly correlated with their parents' heights. This calculator uses the mid-parental height method, a formula pediatricians have relied on for decades, to estimate a likely adult height range based on the mother's and father's heights. It's a useful starting point for understanding growth expectations, though it works alongside, not instead of, a pediatrician's own growth chart tracking. The same tool also includes a straightforward height converter, since switching between centimeters, feet and inches, and meters comes up constantly for travel, fitness, medical forms, and everyday conversions.
How this calculator works
For height prediction, the calculator adds both parents' heights together, then applies the standard mid-parental height adjustment: add 13 cm and divide by 2 for boys, or subtract 13 cm and divide by 2 for girls. This adjustment accounts for the average height difference between adult men and women. Because genetics is only one factor in a child's eventual height, the result is shown as a range of about ±8.5 cm (roughly ±3.4 inches) around the central estimate, which covers where about 68% of children in similar studies actually land. The unit converter simply applies standard conversion factors — 1 inch = 2.54 cm, 1 foot = 12 inches, 1 meter = 100 cm — to convert your entered height into all other common units at once.
Common searches this calculator answers
- How tall will my child be?
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- Convert cm to feet and inches
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- How tall will my son/daughter be based on parents' height?
How to use it
- Choose "Predict Child's Adult Height" or "Height Unit Converter" depending on what you need.
- For height prediction: select the child's gender, enter both parents' heights (in cm or feet & inches), and click calculate.
- For unit conversion: choose your starting unit, enter the height, and click convert to see it in all other common units at once.
- Use the predicted range, not just the central number, since actual adult height naturally varies around the estimate.
Frequently asked questions
How accurate is the adult height prediction?
The mid-parental height method is a well-established estimate, but it's not exact. Roughly 68% of children end up within about 3.4 inches (8.5 cm) of the calculated value, since genetics, nutrition, and health during growth all play a role too.
What is the mid-parental height formula?
For boys: add the mother's and father's height in centimeters, add 13 cm, then divide by 2. For girls: add both parents' heights, subtract 13 cm, then divide by 2. This accounts for the average height difference between adult men and women.
Can this calculator be used for adults?
The height prediction is designed for estimating a child's likely adult height. For adults, use the unit converter tab to switch between centimeters, inches, feet and inches, and meters.
Does this account for a child's current growth pattern?
No. This calculator uses only the parents' heights. Pediatricians typically combine this estimate with a child's own growth chart percentile over time for a more complete picture, especially if growth seems unusually fast or slow.
Why is there a range instead of one exact number?
Height is influenced by more than just parental genetics, so the mid-parental method gives a central estimate plus a realistic range rather than a false sense of precision.
This tool provides general estimates for informational purposes only and is not medical advice. Consult a pediatrician for concerns about a child's growth.
Keywords
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