What are some statistics about shoe size?

The average adult male shoe size ranges from 9-12, while the average adult female shoe size is 9, stated by Statistic Brain Research Institute. The average shoe size has increased by 2 sizes within 40 years.

The size of a child's foot at age 12 is roughly 90% of what it will be as an adult, stated by foot.com. A man named Matthew McGrory holds the record for the largest shoe size at 28.5. Foot.com also mentions that a person's foot increases by 2 sizes when standing up. In addition, a person may have two different shoe sizes and should purchase shoes that fit the larger foot.