Stranger Things has 42 episodes in total.
The episode count comes from all five seasons: Season 1 has 8 episodes, Season 2 has 9, Season 3 has 8, Season 4 has 9, and Season 5 has 8. Adding those totals gives 42. The fifth season’s episodes were released in multiple parts, but each installment counts as a regular episode in the series total.
The show uses chapter-style titles, such as “Chapter One: The Vanishing of Will Byers” and “Chapter Eight: The Rightside Up.” That numbering can make the total feel less straightforward, especially because the chapter numbers restart at the beginning of every season. The finale of Season 5 is also the 42nd episode overall.
Some viewers remember the 34-episode total that applied after the first four seasons: 8 plus 9 plus 8 plus 9 equals 34. Once the eight episodes of the fifth and final season were released, the complete series total became 42. This is why older trivia pages may still show 34 when they have not been updated.