Rome is about 4.9 times smaller than Shanghai.

Shanghai is approximately 6,341 sq km, while Rome is approximately 1,287 sq km, making Rome 20.3% the size of Shanghai.
Tip: This to-scale comparison of Shanghai 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.