| Weight Class | Weight Difference Allowance | |
| Flyweight | 112 pounds to no minimum | not more than 3 lbs. |
| Super Flyweight | 112.1 to 115 pounds | not more than 3 lbs. |
| Bantamweight | 115.1 to 118 pounds | not more than 3 lbs. |
| Super Bantamweight | 118.1 to 122 pounds | not more than 5 lbs. |
| Featherweight | 122.1 to 126 pounds | not more than 5 lbs. |
| Super Featherweight | 126.1 to 130 pounds | not more than 7 lbs. |
| Lightweight | 130.1 to 135 pounds | not more than 7 lbs. |
| Super Lightweight | 135.1 to 140 pounds | not more than 9 lbs. |
| Welterweight | 140.1 to 147 pounds | not more than 9 lbs. |
| Super Welterweight | 147.1 to 154 pounds | not more than 11 lbs. |
| Middleweight | 154.1 to 160 pounds | not more than 11 lbs. |
| Super Middleweight | 160.1 to 167 pounds | not more than 12 lbs. |
| Light Heavyweight | 167.1 to 175 pounds | not more than 12 lbs. |
| Super Light Heavyweight | 175.1 to 183 pounds | not more than 20 lbs. |
| Cruiserweight | 183.1 to 190 pounds | not more than 20 lbs. |
| Heavyweight | 190.1 to 220 pounds | no limit |
| Super Heavyweight | over 220.1 pounds | no limit |