Sao Paulo is about 1.8 times smaller than Ottawa.

Ottawa is approximately 2,779 sq km, while Sao Paulo is approximately 1,523 sq km, making Sao Paulo 54.81% the size of Ottawa.
Tip: This to-scale comparison of Ottawa vs. Sao Paulo 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.