When does naruto become chunin?

Naruto becomes a Chunin after the Chunin Exams arc, which spans episodes 53-88 of the anime and chapters 38-61 of the manga. He earns this promotion during the final round of the exams, although he does so under controversial circumstances.

It's important to note that Naruto's promotion is not solely due to his performance in the exams. He also receives recognition for his courage, determination, and loyalty during the events of the arc.