Taipei is about 12 times smaller than Hanoi.

Hanoi is approximately 3,360 sq km, while Taipei is approximately 272 sq km, making Taipei 8.09% the size of Hanoi.
Tip: This to-scale comparison of Hanoi vs. Taipei 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.