Montreal is about 4.8 times bigger than Copenhagen.

Copenhagen is approximately 90 sq km, while Montreal is approximately 432 sq km, making Montreal 379% larger than Copenhagen.
Tip: This to-scale comparison of Copenhagen vs. Montreal 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.