Amsterdam is about 1.6 times bigger than Buffalo.

Buffalo is approximately 105 sq km, while Amsterdam is approximately 166 sq km, making Amsterdam 59% larger than Buffalo.
Tip: This to-scale comparison of Buffalo 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.