total number of seasons in big bang theory
List of The Big Bang Theory episodes In March 2017, CBS announced that the series was renewed for two more years, leading the show to a total of 12 seasons.[1] The eleventh season premiered on September 25, 2017.[2] As of May 10, 2018,[update] 255 episodes of The Big Bang Theory have aired, concluding the eleventh season. There was also an unaired pilot which CBS did not broadcast.