The champion weighed in at the 170 pounds, the maximum for a fighter contending in a welterweight championship match, while the challenger, Koscheck, weighed in at 169 pounds.
According to oddsmakers from online sportsbook Sportsbook.com, St. Pierre has betting odds of -450 for his title defense while Koscheck has odds of +325.
One fighter that has missed weight in the past, Thiago Alves, managed to make weight for his welterweight bout with John Howard. Alves weighed in at 171 pounds and in non-title fights, fighters are allotted an extra pound of clearance. Howard also weighed in at 171 pounds.
Alves enters his fight with odds of -290 while Howard has a betting line of +215.
For complete weigh-in results for the bouts of UFC 124, see below.
UFC Welterweight Champion Georges St. Pierre (170) vs. Josh Koscheck (169)
Stefan Struve (253) vs. Sean McCorkle (264)
Joe Stevenson (155.5) vs. Mac Danzig (156)
Thiago Alves (171) vs. John Howard (171)
Charles Oliveira (153.5) vs. Jim Miller (155)
Joe Doerksen (185.5) vs. Dan Miller (184.5)
Dustin Hazelett (155) vs. Marc Bocek (155.5)
Rafael Natal (185) vs. Jesse Bongfeldt (185.5)
Sean Pierson (170.5) vs. Matthew Riddle (170.5)
Ricardo Almeida (170.5) vs. T.J. Grant (170)
John Makdessi (155) vs. Pat Audinwood (156)