How tall are you supposed to be if your dad is 6ft and mom is 5'7?

The predicted adult height of a child can be estimated using a simple calculation. For boys, add the father's height and mother's height, then add 5 inches (13 cm) and divide by 2. For girls, subtract 5 inches (13 cm) instead of adding. Therefore, a boy with a 6ft father and 5'7 mother would be estimated to reach a height of approximately 6ft 1.5 inches (186.7 cm) as an adult, while a girl would be estimated to reach around 5ft 8.5 inches (174 cm).