Rome is about 1.2 times smaller than Sao Paulo.

Sao Paulo is approximately 1,523 sq km, while Rome is approximately 1,287 sq km, making Rome 84.53% the size of Sao Paulo.
Tip: This to-scale comparison of Sao Paulo vs. Rome 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.