Weight Classes
Boxing

IBF Weight Class

Heavyweight 200+
Light heavyweight 175-200
Super middleweight 168-175
Middleweight 160-168
Junior middleweight 154-160
Welterweight 147-154
Junior welterweight 140-147
Lightweight 135-140
Junior lightweight 130-135
Featherweight 126-130
Junior featherweight 122-126
Bantamweight 118-122
Junior bantamweight 115-118
Flyweight 112-115
Junior flyweight 108-112
Minimumweight 105-108

Relevance to One Pound Gospel

As Kosaku's weight fluctuates wildly throughout the series, one can use this chart to keep track of his current weight class.