The California State Athletic Commission (CSAC) is one of the only major commissions that regularly releases athletes’ fight night weights (and wallets).
As part of the committee’s efforts to avoid extreme weight cuts, fighters are re-weighed on the day of the event and those numbers are made public. Together UFC 331 officially in the books, the CSAC has released the fight night weights for this past weekend (Saturday, September 19, 2026) at the Crypto.com Arena in Los Angeles, California,
And there were several interesting takeaways.
Despite looking like a smaller fighter, the Ultimate Fighting Championship (UFC) flyweight champion Joshua Van packed on 20.8 pounds after officially weighing in at 125 pounds on Friday morning. “Fearless” entered the Octagon at 145.8 pounds, meaning he was technically a featherweight by the time he defended his 125-pound title.
Meanwhile Alexandre Pantoja went from 125lbs to 140.2lbs, gaining 15.2lbs overnight. As a result, Van held a 5.6-pound advantage over the former champion on fight night.
But perhaps the most eye-catching transformation came from the Featherweight knockout artist Joanderson Britowho slept Old Giga To launch UFC 331 (watch the highlights)
Indeed, the Brazilian weighed in at 145.5 pounds on Friday, but dropped 25.9 pounds to enter the Octagon at 171.4 pounds, which puts him firmly in middleweight territory. Chikadze weighed in at 167 pounds on fight night after gaining 21 pounds, leaving Brito with a 4.4-pound advantage.
Check out the full list of UFC 331 fight night weigh-ins below (via Aaron Bronsteter):
Joshua Van: 125-145.8 pounds (+20.8 pounds, 17 percent)
Alexandre Pantoja: 125-140.2 pounds (+15.2 pounds, 12 percent)
Arman Tsarukyan: 156-177 pounds (+21 pounds, 13 percent)
Mauricio Ruffy: 155-178 pounds (+23 pounds, 15 percent)
Patricio “Pitbull” Freire: 145.5-161.8 pounds (+16.3 pounds, 11 percent)
Doo Ho Choi: £146-£165 (+£19, 13 percent)
Gable Steveson: 240-241.2 pounds (+1.2 pounds, 0 percent)
Sean Sharaf: 241-242.6 pounds (+1.6 pounds, 1 percent)
Alonzo Menifield: 205.5-220.8 pounds (+15.3 pounds, 7 percent)
Iwo Baraniewski: 206-228 pounds (+22 pounds, 11 percent)
Marlon Vera: 136-155.4 pounds (+19.4 pounds, 14 percent)
Charles Jourdain: 135 to 150.2 pounds (+15.2 pounds, 11 percent)
Thai Tuivasa: £264.5-£277.6 (+£13.1, 5 per cent)
Robelis Despaigne: £263-265 (+£2, 1 percent)
Michael Aswell: 146-170.8 pounds (+24.8 pounds, 17 percent)
Joo Sang Yoo: 145.5 pounds to 163.6 pounds (+18.1 pounds, 12 percent)
Ryan Gandra: 186-207.2 pounds (+21.2 pounds, 11 percent)
Ozzy Diaz: 186-212.4 pounds (+26.4 pounds, 14 percent)
Edmen Shahbazyan: 185-204 pounds (+19 pounds, 10 percent)
Brunno Ferreira: 184.5-198.4 pounds (+13.9 pounds, 8 percent)
Casey O’Neill: 125-140.6 pounds (+15.6 pounds, 12 percent)
Eduarda Moura: 125.5 to 139.8 pounds (+14.3 pounds, 11 percent)
Giga Chikadze: 146-167 pounds (+21 pounds, 14 percent)
Joanderson Brito: 145.5 to 171.4 pounds (+25.9 pounds, 18 percent)
Click through for coverage and highlights for complete UFC 331 results HERE.
