Champion Robbie Lawler and No. 4 Tyron Woodley both successfully made weight. Each welterweight weighing 170 pounds.
Justin Scoggin was unable to make weight so the flyweight bout between Ian McCall and Justin Scoggin was scrapped.
Co-main Rose Namajunas weighed 116 pounds and Kowalkiewicz Carolina weighed 114.5.
The fighters of the card took advantage of an early weigh-ins while at the Sheraton Atlanta.
UFC 201 takes place on July 30, 2016 at Philips Arena in Atlanta, Georgia.
Below are the full weigh-in results:
Robbie Lawler (170) vs. Tyron Woodley (170)
Karolina Kowalkiewicz (114.5) vs. Rose Namajunas (116)
Matt Brown (171) vs. Jake Ellenberger (170)
Erik Perez (135) vs. Francisco Rivera (135.5)
Ryan Benoit (126) vs. Fredy Serrano (126)
Ed Herman (205.5) vs. Nikita Krylov (206)
Jorge Masvidal (171) vs. Ross Pearson (170)
Damian Grabowski (256) vs. Anthony Hamilton (258.5)
Wilson Reis (126) vs. Hector Sandoval (126)
Michael Graves (170.5) vs. Bojan Velickovic (170.5)
Cesar Arzamendia (155) vs. Damien Brown (155.5)