The ratings for last night's episode are out. The show continued to build on its lead-in Two and a Half Men in the adults 18-49 demographic, but neither show matched their high ratings of the last two weeks.
The Big Bang Theory was watched by 12.25 million people, placing second in viewers. It posted a 4.5/10 rating in the adults 18-49 demographic, coming first.
, 23:05 10th Oct 2009.
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, 12:12 7th Oct 2009.
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, 13:55 6th Oct 2009.| Title | Date Posted | Category |
| Episode 3.23 Ratings | 25th May 2010 | Show |
| Episode 3.22 Ratings | 18th May 2010 | Show |
| Episode 3.21 Ratings | 11th May 2010 | Show |
| Episode 3.20 Ratings | 4th May 2010 | Show |
| Episode 3.19 Ratings | 13th April 2010 | Show |