Amsterdam is about 1.2 times bigger than Pittsburgh.

Pittsburgh is approximately 143 sq km, while Amsterdam is approximately 166 sq km, making Amsterdam 16% larger than Pittsburgh.
Tip: This to-scale comparison of Pittsburgh vs. Amsterdam 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.