Men's weight classes 1904[lower-alpha 1] 1908 1920–1936 1948 1952–1964 1968–1980 1984–2000 2004–2008[2] 2012–2016[3] 2020 [4] Heavyweight +158 lb (+71.7 kg) Heavyweight +175 lb (+79.4 kg) Heavyweight +80 kg Heavyweight +81 kg Super-Heavyweight +91 kg Heavyweight 81–91 kg Light-Heavyweight 75–81 kg Light-Heavyweight 73–80 kg Light-Heavyweight 160–175 lb (72.6–79.4 kg) Middleweight 71–75 kg Middleweight 69–75 kg Middleweight 67–73 kg Middleweight 147–160 lb (66.7–72.6 kg) Middleweight 145–158 lb (65.8–71.7 kg) Middleweight 140–158 lb (63.5–71.7 kg) Light-Middleweight 67–71 kg Welterweight 64–69 kg Welterweight 63–69 kg Welterweight 62–67 kg Welterweight 63.5–67 kg Welterweight 135–147 lb (61.2–66.7 kg) Welterweight 135–145 lb (61.2–65.8 kg) Light-Welterweight 60–64 kg Lightweight 126–140 lb (57.2–63.5 kg) Light-Welterweight 60–63.5 kg Lightweight 57–63 kg Lightweight 58–62 kg Lightweight 125–135 lb (56.7–61.2 kg) Lightweight 126–135 lb (57.2–61.2 kg) Lightweight 57–60 kg Lightweight 56–60 kg Featherweight 54–58 kg Featherweight 116–126 lb (52.6–57.2 kg) Featherweight 118[lower-alpha 2]–126 lb (53.5–57.2 kg) Featherweight 54–57 kg Featherweight 52–57 kg Featherweight 115–125 lb (52.2–56.7 kg) Bantamweight 52–56 kg Bantamweight 51–54 kg Bantamweight 112–118[lower-alpha 2] lb (50.8–53.5 kg) Bantamweight –116 lb (-52.6 kg) Bantamweight 105–115 lb (47.6–52.2 kg) Flyweight 49–52 kg Flyweight 48–52 kg Flyweight -51 kg Flyweight 48–51 kg Flyweight –112 lb (-50.8 kg) Light-Flyweight 46–49 kg Light-Flyweight -48 kg Flyweight –105 lb (-47.6 kg) 7 5 8 8 10 11 12 11 10 8