Boise is about 2.9 times smaller than Toronto.

Toronto is approximately 630 sq km, while Boise is approximately 221 sq km, making Boise 35.0% the size of Toronto.
Tip: This to-scale comparison of Toronto vs. Boise 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.