Below is a conversion guide to understand the different weight divisions (limits in pounds (lbs), kilograms (kg) and stones (st), followed by division title). Women’s Weight Divisions are also listed, plus Amateur for both men and women.

Notable minimumweight champions include Ricardo Lopez, Ratanapol Sor Vorapin, Jose Antonio Aguirre, Ivan Calderon, and Thammanoon Niyomtrong (also known as Knockout CP Freshmart, who has been the WBA champion since 2016).

Usyk started full of energy and hunger and bounced two left hands off Joshua's head. Joshua kept pressing but could not find the punches to hurt Usyk. The challenger was busier and bolder and finished the champion with a barrage of hooks that left Joshua slumped on the ropes and rescued by the final bell. Had there been a few more seconds, Joshua looked like he would have been stopped.

The International Boxing Federation (IBF) has a unique weigh-in policy in title fights. In addition to making the weight at the official weigh-in the day before the fight, the boxers are required to submit to a weight check on the morning of the fight. During this later weigh-in, the fighter must weigh no more than 10 pounds (4.5 kg) above the weight limit for the fight. If a boxer skips the morning weigh-in, or fails to make weight at that time, the fight can still proceed, but the IBF title will not be at stake. In heavyweight title fights, the second weigh-in is still mandatory, but since there is no upper weight limit in that class, a boxer can only be sanctioned for failing to submit to the weigh-in.

As well as being successful at lower weights, Julio Cesar Chavez Sr. was a great light-welterweight as well, but Aaron Pryor is seen as the top dog of the division throughout history. Other legends include Antonio Cervantes, Niccolino Locche and Kostya Tszyu, while Terence Crawford was undisputed champion in recent times.

Adrien ‘The Problem’ Broner of Cincinnati, Ohio is one of the latest boxers to win world titles in four weight divisions as he achieved the feat in 2015. Broner became the second-youngest boxer to do it at age 25, behind Oscar De La Hoya who was 24. Broner has won the WBO Super Featherweight, WBC Lightweight, WBA Super Lightweight, and Welterweight Titles. There has been a 17 lb weight gap between Broner’s belts and he won them all in a span of just under four years. Broner, who turned pro in 2008, has a current record of 33-2 with 24 Kos and one no-contest. The 27-year-old Broner is scheduled to meet undefeated current WBC Lightweight Champion Mikey Garcia (36-0, 30 Kos) in a junior welterweight bout in Brooklyn, New York on July 29th.

The date is that since which a continuous world title has been recognised by a major sanctioning body; some classes had earlier champions recognised intermittently or by minor bodies. One current weight class with only minor recognition is "super cruiserweight"; widely used as an informal descriptor, it is a formal weight class of the lightly regarded International Boxing Association at a limit of 210 lb; the IBA's cruiserweight limit is 190 lb.

Jung-Koo Chang was a hard-hitting South Korean champion through the 1980s, while Michael Carbajal and Chiquita Gonzalez helped build light-flyweight into a more mainstream division with their incredible fights. Japan always boast top fighters within the smaller weights and Ken Shiro and Kosei Tanaka are others to follow that trend in more modern times.

Colombian-Canadian Rivas, who unsuccessfully challenged Dillian Whyte for the then-vacant WBC interim heavyweight title in London in July 2019, won the inaugural WBC bridgerweight belt by unanimous decision against Ryan Rozicki in Montreal in October 2021.

Canelo Álvarez is the major name who has excelled in this division across all organizations, unifying all major titles and only losing twice to Dmitry Bivol and Floyd Mayweather Jr. at different weight classes.

Still, during the division’s quarter century of existence it has been home to a pair of all-time greats (albeit briefly) and at least half a dozen future hall of famers who put on some of the most memorable and dramatic fights and performances of the last 20 years.

In 1920, a de facto minimum weight for a heavyweight was set at 175 pounds (12 st 7 lb, 79 kg) with the standardization of a weight limit for the light heavyweight division. The addition of the cruiserweight 8 division filipino boxing champions, which began in 1979, reset the de facto minimum, first to 190 pounds and then to 200 pounds in 2004 when boxing's major sanctioning bodies universally raised the weight limit at which they would recognize champions. The World Boxing Council created a new division called bridgerweight for boxers weighing between 200 and 225 pounds. As of June 2022, no other major organization has recognized the division.

Boxing has its own "Original Eight" weight divisions, also known as the "traditional", "classic", or "glamour" divisions. These divisions are the most prominent and widely recognized weight divisions in boxing. Manny Pacquiao has won world championships in the greatest number of the glamour divisions, winning championships in the flyweight, featherweight, lightweight, and welterweight divisions.