Manchester is about 11 times smaller than Rome.

Rome is approximately 1,287 sq km, while Manchester is approximately 116 sq km, making Manchester 8.98% the size of Rome.
Tip: This to-scale comparison of Rome vs. Manchester 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.