Amsterdam is about 20 times smaller than Hanoi.

Hanoi is approximately 3,360 sq km, while Amsterdam is approximately 166 sq km, making Amsterdam 4.93% the size of Hanoi.
Tip: This to-scale comparison of Hanoi 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.