Phoenix is about 4.3 times bigger than Munich.

Munich is approximately 311 sq km, while Phoenix is approximately 1,342 sq km, making Phoenix 332% larger than Munich.
Tip: This to-scale comparison of Munich vs. Phoenix uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.