WEIGHT CLASSES WEIGHT RANGES WEIGHT DIFFERENTIAL
Junior Atomweight 50 lbs to 55 5
Junior Flyweight 55.1 lbs to 60 5
Junior Bantamweight 60.1 lbs to 65 5
Junior Featherweight 65.1 lbs to 70 5
Junior Lightweight 70.1 lbs to 75 5
Junior Welterweight 75.1 lbs to 80 5
Junior Middleweight 80.1 lbs to 85 5
Junior Light Heavyweight 85.1 lbs to 90 5
Junior Cruiserweight 90.1 lbs to 95 5
Junior Heavyweight 95.1 lbs to 100 5
Straw-weight 100.1 lbs to 105 5
Atomweight 105.1 lbs to 110 5
Flyweight 110.1 lbs to 115 5
Bantamweight 115.1 lbs to 120 5
Featherweight 120.1 lbs to 125 5
Lightweight 125.1 lbs to 130 5
Super Lightweight 130.1 lbs to 135 5
Light Welterweight 135.1 lbs to 140 5
Welterweight 140.1 lbs to 145 5
Super Welterweight 145.1 lbs to 150 5
Light Middleweight 150.1 lbs to 155 5
Middleweight 155.1 lbs to 162 7
Super Middleweight 162.1 lbs to 170 8
Light Heavyweight 170.1 lbs to 178 8
Light Cruiserweight 178.1 lbs to 186 8
Cruiserweight 186.1 lbs to 195 9
Heavyweight 195.1 lbs to 215 20
Super Heavyweight 215.1 lbs to 235 20
Extreme Heavyweight 235.1 lbs and up No limit

About Weight Classes – “CATCH WEIGHTS”

Master Mehrdad's Muay Thai Classic XXIIIThis is establish when a Light Welterweight fighter is at 140 lbs and a Welterweight at 144 lbs fight. What is look in this type of case is the most narrow weight spread, which is always in the lower weight class of the two fighters. For Light Welterweight fighter, the weight spread is 5 lbs. and for Welterweight class it’s 7, it goes to a 5 lb. spread.

A fight can only be approve inside the limits of the weight classes of the lightest fighter. So a good example is when a Light Welterweight at 140 lbs is approve to fight a Welterweight at 144. However, if the Light Welterweight fighter was 138 and the Welterweight is at 144, the fight will not be allowed since is over 5 pounds.