A child's adult height can be roughly predicted using the parents' heights with a simple formula called the Mid-Parental Height formula:

• For boys: Height=father’s height+mother’s height+5 inches (13 cm)2\text{Height}=\frac{\text{father's height}+\text{mother's height}+5\text{ inches (13 cm)}}{2}Height=2father’s height+mother’s height+5 inches (13 cm)​
• For girls: Height=father’s height+mother’s height−5 inches (13 cm)2\text{Height}=\frac{\text{father's height}+\text{mother's height}-5\text{ inches (13 cm)}}{2}Height=2father’s height+mother’s height−5 inches (13 cm)​

This formula gives an estimate with about a 4-inch (10 cm) margin of error. Other factors like nutrition, health during growth, and genetics also influence the final height. More precise predictions can involve using the child's current height and weight if they are over 4 years old or bone age X-rays for growth plate analysis, but the Mid-Parental Height formula is the easiest starting point for parents to estimate adult height.