boxing weight classes

Chart to convert kilograms to pounds

The weight classes for amateur (including Olympic) and professional boxing in the United States are:

Class	Maximum Weight in Kilograms
Class	Amateur	Professional
Light Flyweight	48	49
Flyweight	51	51
Bantamweight	54	53.5
Super Bantamweight	—	55
Featherweight	57	57
Junior Lightweight	—	59
Lightweight	60	61
Light Welterweight	63.5	63.5
Welterweight	67	66.5
Light Middleweight	71	70
Middleweight	75	72.5
Light Heavyweight	81	79
Cruiserweight	—	88.45
Heavyweight	91	>88.45
Super Heavyweight	> 91	—

A boxer must weigh more than the maximum weight for the previous class and no more than the maximum weight for his class. A boxer cannot compete in more than one weight class in a single tournament.

Weigh-in begins at 8 am. A boxer who is no more than 2 pounds overweight has until 10 am to work off the excess weight and be reweighed. A boxer who is more than 2 pounds overweight is immediately disqualified.

Interestingly, though the weight classes are defined in kilograms, in the United States the weighing of boxers is done in customary units, which leads to one of the last survivals of the dram. For example, a Super Heavyweight must weigh more than 200 pounds, 9 ounces, and 15 drams.