• 
• Calculate your projected height. Working in inches or centimeters, you can try to predict your height based on the height of your parents.
  • Add up your mom and dad’s heights (in inches or cm).
  • Add 5 inches (13 cm) if you’re a boy; subtract 5 inches (13 cm) if you’re a girl.
  • Divide by 2.
  • The answer is your predicted height, give or take 4 inches. Note that this isn’t an absolute calculation, but it should be pretty close.

via

• Did You Know?
• Family
• Kids
• Reference