The welterweight champ Hendricks came in at 170 for the main event tilt, while the challenger Lawler also weighed 170 pounds. The latter will be looking to avenge a March, decision loss to Hendricks, which left him with the welterweight title.
In the co-main-event, lightweight champion Anthony Pettis will battle Gilbert Melendez, and the two tipped the scales at 154.5 and 155 respectively.
So, here are the official weigh-in results folks. UFC 181 will be hosted by the Mandalay Bay Events Center.
Main Card (Pay-per-view, 10 PM/ET)
Johny Hendricks (170) vs. Robbie Lawler (170)
Anthony Pettis (154.5) vs. Gilbert Melendez (155)
Travis Browne (243) vs. Brendan Schaub (244)
Todd Duffee (236.5) vs. Anthony Hamilton (256)
Tony Ferguson (156) vs. Abel Trujillo (156)
Preliminary Card (FOX Sports 1, 8 PM/ET)
Urijah Faber (135.5) vs. Francisco Rivera (135)
Eddie Gordon (185.5) vs. Josh Samman (185.5)
Corey Anderson (204.5) vs. Justin Jones (204.5)
Ashlee Evans-Smith (135.5) vs. Raquel Pennington (136)
Preliminary Card (UFC Fight Pass, 7 PM/ET)
Matt Hobar (136) vs. Sergio Pettis (135)
Clay Collard (146) vs. Alex White (145.5)