Fight Weight Calculator
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Plan safe combat sports weight cutting with daily targets for water loading, deficit, and rehydration. Timeline calculator for making weight before weigh-in.
Calculate reach and wingspan advantage in combat sports. Compare fighter measurements for striking distance and tactical matchup analysis.
Estimate punch and strike force from mass and velocity measurements. Calculate impact energy in Newtons and joules for boxing and martial arts training.
Identify the heaviest division you qualify for at weigh-in. Many fighters choose one class below their walk-around weight for competitive advantage.
Target class = Highest class where Weight ≤ Class limitCalculate the difference between training weight and class limit. Safe cuts are typically 5–8% body weight; extreme cuts exceed 10%.
Cut required = Walk-around weight − Class limitOrganizations with same-day weigh-ins (most amateur boxing, some states) require competing at or near fight weight without same-week dehydration cuts.
Same-day weigh-in: target ≤ limit at scaleUpdated: July 2026
A 72 kg athlete qualifies for light welter (64 kg) through middleweight (75 kg). Choosing welterweight (69 kg) requires a manageable 3 kg cut from walk-around weight.
Walking at 178 lb between lightweight (155) and welterweight (170), a fighter evaluates whether a 23 lb cut to 155 or 8 lb cut to 170 better matches opponent pool and strength.
A high school wrestler at 62 kg selects the 60 kg class with a 2 kg certified cut — within safe limits for scholastic weigh-in protocols.
Combat sports athletes must compete within strict weight class limits set by each sanctioning body. Enter your current body weight and sport to identify eligible weight classes, the optimal class for your frame, and how much weight you may need to cut.