Pittsburgh is about 3 times smaller than Montreal.

Montreal is approximately 432 sq km, while Pittsburgh is approximately 143 sq km, making Pittsburgh 33.24% the size of Montreal.
Tip: This to-scale comparison of Montreal vs. Pittsburgh 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.