The UFC 131: Dos Santos vs. Carwin weigh-in results went as follows:
UFC 131 weigh-in results: Darren Elkins (145) vs. Michihiro Omigawa (145)
UFC 131 weigh-in results: Joey Beltran (247) vs. Aaron Rosa (261)
UFC 131 weigh-in results: Dustin Poirier (146) vs. Jason Young (145)
UFC 131 weigh-in results: James Head (186) vs. Nick Ring (185)
UFC 131 weigh-in results: Junior Dos Santos (239) vs. Shane Carwin (254)
UFC 131 weigh-in results: Mike Massenzio (201) vs. Krzysztof Soszynski (205)
UFC 131 weigh-in results: Jesse Bongfeldt (185) vs. Chris Weidman (186)
UFC 131 weigh-in results: Yves Edwards (155) vs. Sam Stout (155)
UFC 131 weigh-in results: Donald Cerrone (155) vs. Vagner Rocha (155)
UFC 131 weigh-in results: Jon Olav Einemo (261) vs. Dave Herman (233)
UFC 131 weigh-in results: Demian Maia (186) vs. Mark Munoz (186)
UFC 131 weigh-in results: Kenny Florian (146) vs. Diego Nunes (145)