The Boxing Weight Class Calculator determines which weight class a boxer, MMA fighter, or wrestler competes in, and shows the required cut or gain to reach any target class. Covers WBC professional boxing (17 classes), UFC/MMA (9 classes), and amateur AIBA tables.
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Combat sports are organized around weight classes to ensure fair competition. Whether you're a recreational boxer curious about your class, a competitive fighter planning a weight cut, or a coach setting realistic competition targets, knowing exactly where you fall and what it takes to move between classes is the starting point. The boxing weight class calculator covers boxing, MMA, wrestling, and kickboxing classifications.
Use this online calculator for your current weight class. The body fat calculator and combat sports calculators provide complementary competitive tools.
Aggressive weight cutting — rapidly losing water weight before a weigh-in — is common in combat sports but carries serious health risks: dehydration above 3–5% body weight impairs cognitive and physical performance; rapid cutting has been associated with kidney injury, cardiac arrhythmia, and fatalities. Many sanctioning bodies now require same-day or next-day weigh-ins specifically to limit extreme cuts. The safest competitive approach: compete at your natural walking weight, or limit water manipulation to below 5% body weight and rehydrate fully before competition.
The weight class code is a numeric identifier representing your division (1 = lightest, ascending to the heaviest). The weight limit shows the maximum weight allowed for that division at the official weigh-in.
If the 'Weight to Next Class' value is large (e.g., 5+ kg), you have significant room within your current division. If it is small (less than 2 kg), you are near the boundary and should monitor your weight carefully during camp. A very small margin means even minor fluctuations could push you into the next class.
For practical purposes, most fighters aim to weigh in slightly under their class limit, typically 0.1-0.5 kg below, to provide a safety margin. Walking around at a weight significantly above your fighting weight class (more than 10% above the limit) suggests the weight cut may be too extreme for optimal health and performance.
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At 75 kg, this fighter falls into the super middleweight division (76.204 kg / 168 lbs limit). The next class up is light heavyweight at 79.378 kg (175 lbs), only 4.4 kg away. The fighter comfortably makes super middleweight with 1.2 kg to spare.
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At 55 kg, this female boxer fits in the lightweight division (57.153 kg / 126 lbs limit). She has 2.2 kg of margin within the class and the next division (super lightweight at 58.967 kg) is 4 kg above her current weight.
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