Breaking Down Each Boxing Weight Class | Bleacher Report

History of the Weight Divisions

In January 2015, the World Boxing Council, World Boxing Association and the International Boxing Federation reached an agreement to standardize the names of professional boxing’s then 17 weight divisions. (The World Boxing Organization has yet to adopt these standard class names.)

The currently-recognized weights for professional male boxers, listed in maximum allowable weight for each division/class/category, as defined by these four major sanctioning bodies, are:

Division/Class Stone kg Pounds
Minimumweight (WBC/WBA/IBF)
Mini Flyweight (WBO)
7½ st 47,627 kg 105 lbs
Light Flyweight
Junior Flyweight
7st 10 lbs 48,988 kg 108 lbs
Flyweight (All four) 8 st 50,802 kg 112 lbs
Super Flyweight
Jr Bantamweight
8 st 3 lbs 52,163 kg 115 lbs
Bantamweight 8 st 6 lbs 53,525 kg 118 lbs
Super Bantamweight
Jr Featherweight
8 st 10 lbs 55,225 kg 122 lbs
Featherweight 9 st 57,153 kg 126 lbs
Super Featherweight
Jr Lightweight
9 st 4 lbs 58,967 kg 130 lbs
Lightweight 9 st 9 lbs 61,235 kg 135 lbs
Super Lightweight
Jr Welterweight
10 st 63,503 kg 140 lbs
Welterweight 10½ st 66,678 kg 147 lbs
Super Welterweight
Jr Middleweight
11 st 69,85 kg 154 lbs
Middleweight 11 st 6 lbs 72,574 kg 160 lbs
Super Middleweight 12 st 76,203 kg 168 lbs
Light Heavyweight 12½ st 79,378 kg 175 lbs
Cruiserweight
Jr Heavyweight
14 st 4 lbs 90,892 kg 200 lbs
Heavyweight {amp}gt; 14 st 4 lbs {amp}gt; 90,892 kg {amp}gt; 200 lbs
  • Light Flyweight: up to 106 pounds
  • Flyweight: 112
  • Bantamweight: 119
  • Featherweight: 125
  • Lightweight: 132
  • Light Welterweight: 141
  • Welterweight: 152
  • Middleweight: 165
  • Light Heavyweight: 178
  • Heavyweight: 201
  • Super Heavyweight: over 201

The 21 National Sporting Club (NSC) Rules- (1891-?)
London-based private club amends 12 Queensberry Rules, modifying with new augment rules with nine specific criteria, such as designating role of officials;

  • Heavyweight [176 lbs plus; at least 75.3 kg; over 12 stone, 7 lbs]
  • Cruiserweight [175 lb maximum; 79.5 kg; or 12 stone, 7 pounds] later called «lighter heavyweight» by the English and «light heavyweight» by the Americans. Solidified under the New York State Athletic Commission and National Boxing Association as one division, with a uniform name.
  • Middleweight [160 lbs maximum; 72.7 kg; or 11 stone, 4 pounds]
  • Welterweight [147 lbs maximum; 66.8 kg; or 10 stone, 7 pounds]
  • Lightweight [135lbs maximum; 61.4 kg; or 9 stone, 9 pounds]
  • Featherweight [126lbs maximum; 57.3 kg; or 9 stone]
  • Bantamweight [118lbs maximum; 53.6 kg; or 8 stone, 6 pounds]
  • Flyweight [112lbs maximum; 50.9 kg; or 8 stone]

NOTE: weight class key- one pound equals .45359237 kilograms
one pound equals .0714285714 stone- sixteen ounces equals one pound, 14 stone and 6 kilograms.

Olympic Boxing Classes {amp}amp; Weight Divisions: [American lbs, European kilograms, English stones]

  • One pound (lb as unit of mass) is equal to 16 ounces (oz)
  • One kilogram (also equal to 1,000 grams) is equal to 2.2 lbs
  • One stone is equal to 14 pounds (with pounds rounding 5/8th)
  • Super Heavyweight: [202lbs above; 91.6 kg or 14 stone, 6 pounds] – (est. 1984-end 2004): legislation pending before International Olympic Congress, not subject to change by AIBA.
  • Heavyweight: [179-201lbs*; 81.2 – 91.2 kg; 12 stone, 11 pounds – 14 stone, 5 pounds]– (est. 1904)
  • Light Heavyweight: [166-178lbs; 75.3 – 80.7 kg; or 11 stone, 12 pounds – 12 stone, 10 pounds – (est. 1920)
  • Middleweight: [157-165lbs; 71.2 – 74.8; or 11 stone, 3 pounds – 11 stone, 11 pounds] – (est. 1904)
  • Light Middleweight: [148-156lbs; 67.1 – 70.8 kg; or 10 stone, 8 pounds – 11 stone, 2 pound] – (est. 1952)
  • Welterweight: [140-147lbs; 63.5 – 66.7 kg; or 10 stone – 10 stone, 7 pounds] – (est. 1904)
  • Light Welterweight: [133-139lbs; 60.3 – 63.0 kg; or 9 stone, 7 pounds – 9 stone, 13 pounds] – (est. 1952)
  • Lightweight: [126-132lbs; 57.2 – 59.9 kg; or 9 stone – 9 stone, 6 pounds] – (est. 1904)
  • Featherweight: [120-125lbs; 54.4 – 56.7 kg; or 8 stone, 8 pounds – 8 stone, 13 pounds] – (est. 1904)
  • Bantamweight: [113-119lbs; 51.3 – 53.9 kg; or 8 stone, 1 pound – 8 stone, 7 pounds] – (est. 1904)
  • Flyweight: [107-112lbs; 48.5 – 50.8 kg; or 7 stone, 9 pounds – 8 stone] – (est. 1904)
  • Light Flyweight: [106 – below; less than 48.1 kg; or 7 stone, 8 pounds and below] – (est. 1968)

Detailed Weight Division History
[in American lbs, European kilograms, English stones]

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