The size of the Star Wars galaxy, known as the Star Wars Expanded Universe (EU), is not precisely defined in terms of its physical dimensions. However, it is generally understood that the Star Wars galaxy is comparable in size to our own Milky Way galaxy.
The Milky Way galaxy has a diameter of approximately 100,000 light-years, containing billions of stars, star systems, and various celestial objects. Similarly, the Star Wars galaxy is depicted as a vast expanse of space with numerous star systems, planets, and civilizations.
It's important to note that the Star Wars universe is a work of fiction, and its scale and dimensions are primarily determined by storytelling considerations rather than scientific accuracy. Therefore, specific measurements or comparisons between the Star Wars galaxy and the Milky Way are not provided in official sources.