California State Athletic Commission (CSAC) is one of the only major commissions that routinely releases athletes’ fight night weights (and purses).
As part of the commission’s efforts to discourage extreme weight cutting, fighters are weighed again on the day of the event, and those numbers are released to the public. With UFC 331officially in the books, CSAC released the fight night weights from this past weekend (Sat., Sept. 19, 2026) inside Crypto.com Arena in Los Angeles, California,
And there
were several interesting takeaways.
Despite looking like the smaller fighter, Ultimate Fighting Championship (UFC) Flyweight champion Joshua Van packed on 20.8 pounds after officially weighing 125 pounds on Friday morning. “The 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 125 pounds to 140.2 pounds, gaining 15.2 pounds overnight. As a result, Van held a 5.6-pound advantage over the former champion on fight night.
The largest overall weight gain belonged to Middleweight Ozzy Diaz, who ballooned from 186 pounds to 212.4 pounds — a whopping 26.4-pound increase.
However, perhaps the most eye-popping transformation came from Featherweight knockout artist Joanderson Brito, who slept Giga Chikadze to kick off UFC 331 (watch highlights)
Indeed, the Brazilian weighed 145.5 pounds on Friday but packed on a staggering 25.9 pounds to enter the Octagon at 171.4 pounds, putting him squarely in Welterweight territory. Chikadze weighed 167 pounds on fight night after gaining 21 pounds, leaving Brito with a 4.4-pound advantage.
Check out the complete list of UFC 331 fight night weights below (via Aaron Bronsteter):
Joshua Van: 125 to 145.8 pounds (+20.8 pounds, 17 percent)
Alexandre Pantoja: 125 to 140.2 pounds (+15.2 pounds, 12 percent)
Arman Tsarukyan: 156 to 177 pounds (+21 pounds, 13 percent)
Mauricio Ruffy: 155 to 178 pounds (+23 pounds, 15 percent)
Patricio “Pitbull” Freire: 145.5 to 161.8 pounds (+16.3 pounds, 11 percent)
Doo Ho Choi: 146 to 165 pounds (+19 pounds, 13 percent)
Gable Steveson: 240 to 241.2 pounds (+1.2 pounds, 0 percent)
Sean Sharaf: 241 to 242.6 pounds (+1.6 pounds, 1 percent)
Alonzo Menifield: 205.5 to 220.8 pounds (+15.3 pounds, 7 percent)
Iwo Baraniewski: 206 to 228 pounds (+22 pounds, 11 percent)
Marlon Vera: 136 to 155.4 pounds (+19.4 pounds, 14 percent)
Charles Jourdain: 135 to 150.2 pounds (+15.2 pounds, 11 percent)
Tai Tuivasa: 264.5 to 277.6 pounds (+13.1 pounds, 5 percent)
Robelis Despaigne: 263 to 265 pounds (+2 pounds, 1 percent)
Michael Aswell: 146 to 170.8 pounds (+24.8 pounds, 17 percent)
Joo Sang Yoo: 145.5 to 163.6 pounds (+18.1 pounds, 12 percent)
Ryan Gandra: 186 to 207.2 pounds (+21.2 pounds, 11 percent)
Ozzy Diaz: 186 to 212.4 pounds (+26.4 pounds, 14 percent)
Edmen Shahbazyan: 185 to 204 pounds (+19 pounds, 10 percent)
Brunno Ferreira: 184.5 to 198.4 pounds (+13.9 pounds, 8 percent)
Casey O’Neill: 125 to 140.6 pounds (+15.6 pounds, 12 percent)
Eduarda Moura: 125.5 to 139.8 pounds (+14.3 pounds, 11 percent)
Giga Chikadze: 146 to 167 pounds (+21 pounds, 14 percent)
Joanderson Brito: 145.5 to 171.4 pounds (+25.9 pounds, 18 percent)
For complete UFC 331 results, coverage and highlights click HERE.
