There are many differences between pro boxing and amateur boxing
Pro boxing and amateur boxing do not differ only in the ability and experience of their fighters, but in quite a few other areas. They do not have the same governing bodies, nor do they use the same equipment. What's more, the matches are structured differently and are not scored in the same way.
Pro boxers compete for money prizes and are governed by a number of organizations. The major four are the World Boxing Association, World Boxing Council, World Boxing Organization, and International Boxing Federation. Each has its own rules. Amateurs, who do not fight for money, are governed by the AIBA or International Boxing Association, which has governing bodies in 190 affiliated countries, of which the United States is one. The AIBA also oversees boxing at the Olympics.
Amateur boxers are required to wear protective headguards and singlet tops, neither of which pro boxers are allowed to wear. An amateur glove, which weighs 10 ounces, has a white area over the knuckles. The judges only award a point when that area contacts an area of the opponent's body used for scoring. In contrast, a pro's glove can weigh 6, 8, or 10 ounces, depending on jurisdiction and what is agreed to by the opponents.
Ring Size and Scoring
In pro boxing, the size of the ring can vary. The boxer can hit his opponent above the belt, but the hit must land on the side or front of the head or body. Amateur rings can be no smaller than 16 by 16 feet and no larger than 20 by 20 feet. The white area of the glove must contact on the front or side of the opponent's head or body and the blow must also be above the belt.
Because pro boxers fight for money, they prefer a quick match. They look to win with a knockout, so they tend to hit much harder blows. The winner of each round gets 10 points, while the loser gets no more than 9. Points are awarded for aggressiveness, control, defense, punches landed, and their impact. Who wins is based on the opinion of the judges. In amateur bouts, the total number of scored punches, whatever their impact, is what determines the winner. No extra points are awarded for a knockout.