Montreal is about 1.2 times smaller than Lake Tahoe.

Lake Tahoe is approximately 502 km² (194 sq mi), while Montreal is approximately 432 sq km, making Montreal 85.96% the size of Lake Tahoe.
Tip: This to-scale comparison of Lake Tahoe 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.