Pasadena is about 2.8 times smaller than Amsterdam.

Amsterdam is approximately 166 sq km, while Pasadena is approximately 59 sq km, making Pasadena 35.87% the size of Amsterdam.
Tip: This to-scale comparison of Amsterdam vs. Pasadena 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.