Question: what is the size difference between a college football and an nfl football?
Answer: In overall circumference, college footballs can be up to 1 1/4 inches smaller than NFL footballs. To get into the weeds, the circumference of college footballs ranges from 20 3/4 inches to 21 1/4 inches lengthwise from end to end, versus 21 inches to 21 1/4 inches in the NFL.