Copenhagen is about 4.8 times smaller than Montreal.

Montreal is approximately 432 sq km, while Copenhagen is approximately 90 sq km, making Copenhagen 20.86% the size of Montreal.
Tip: This to-scale comparison of Montreal vs. Copenhagen 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.