Mailbox Class
| Category | Weight - Men | Weight - Women |
|---|
| Strawweight | up to 105 lbs | up to 102 lbs |
| Mini Flyweight | - | up to 105 lbs |
| Junior Flyweight | 105 to 108 lbs | 105 to 108 lbs |
| Flyweight | 108 to 112 lbs | 108 to 112 lbs |
| Junior Bantam Weight | 112 to 115 lbs | 112 to 115 lbs |
| Bantamweight | 115 to 118 lbs | 115 to 118 lbs |
| Junior Featherweight | 118 to 122 lbs | 118 to 122 lbs |
| Featherweight | 122 to 126 lbs | 122 to 126 lbs |
| Junior Lightweight | 126 to 130 lbs | 126 to 130 lbs |
| Lightweight | 130 to 135 lbs | 130 to 135 lbs |
| Junior Welterweight | 135 to 140 lbs | 135 to 140 lbs |
| Welterweight | 140 to 147 lbs | 140 to 147 lbs |
| Super Welterweight | 147 to 154 lbs | - |
| Junior Middleweight | - | 147 to 154 lbs |
| Middleweight | 154 to 160 lbs | 154 to 160 lbs |
| Super Middleweight | 160 to 168 lbs | 160 to 168 lbs |
| Light Heavyweight | 168 to 175 lbs | 168 to 175 lbs |
| Cruiserweight | 175 to 200 lbs | - |
| Heavyweight | over 200 lbs | Over 175 lbs |