How many movements does a Classical symphony usually have?

A Classical symphony typically consists of four movements.12

This structure evolved from the three-movement Italian opera overture (fast–slow–fast), with the addition of a dance-style movement—usually a minuet—inserted between the second and final movements. While four movements became the standard, early symphonies, such as some of Joseph Haydn's earliest works, were sometimes composed in three movements.23

The typical four-movement arrangement generally follows this pattern:
* First movement: Usually in sonata form and fast in tempo.1
* Second movement: Provides contrast with a slower tempo.1
* Third movement: A dance-style movement, such as a minuet or, in later works by composers like Beethoven, a scherzo.1
* Fourth movement (finale): Usually fast, often utilizing rondo or sonata form.1