How big should a 13 year olds feet be?

There is no definitive answer to this question, as feet size can vary dramatically from person to person. However, a general rule of thumb is that a 13 year old's feet should be approximately 8.5 inches in length for females and 9.5 inches in length for males. It's important to remember that this is just an average and some 13 year olds may have smaller or larger feet. If you're concerned about the size of your child's feet, it's best to consult with a medical professional.