Toronto is about 2.9 times bigger than Boise.

Boise is approximately 221 sq km, while Toronto is approximately 630 sq km, making Toronto 186% larger than Boise.
Tip: This to-scale comparison of Boise vs. Toronto 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.