Sherlock produced 13 total episodes, including the special. The BBC series consists of four three-episode series, giving 12 regular episodes, plus the one-off special “The Abominable Bride.”
The programme premiered in 2010 and concluded with its fourth series in 2017. Unlike many conventional dramas, each regular instalment runs roughly 85 to 90 minutes, making the episode count feel small while the total screen time is substantial.
A common mix-up is counting only the four three-part series and answering 12. That number excludes the special, which aired separately on 1 January 2016 and is included in the show’s official total of 13 episodes. The 2013 Christmas mini-episode is generally treated as a promotional or supplementary release rather than an additional standard episode.