Amsterdam is about 1.2 times smaller than Buenos Aires.

Buenos Aires is approximately 203 sq km, while Amsterdam is approximately 166 sq km, making Amsterdam 81.53% the size of Buenos Aires.
Tip: This to-scale comparison of Buenos Aires 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.