Staten Island is about 2.9 times smaller than Montreal.

Montreal is approximately 432 sq km, while Staten Island is approximately 149 sq km, making Staten Island 34.53% the size of Montreal.
Tip: This to-scale comparison of Montreal vs. Staten Island 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.