One of them is adding 2.5 inches (7.6 cm) to the average of the parent's height for a boy and subtracting 2.5 inches (7.6 cm) for a girl. The second calculator above is based on this

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Formula 1: To figure out the height by this method, follow the given steps: Figure out how tall your child is or was at age 2. Multiply that height by 2. This is the result of their predicted height.

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