Rome is about 2.5 times bigger than Budapest.

Budapest is approximately 525 sq km, while Rome is approximately 1,287 sq km, making Rome 145% larger than Budapest.
Tip: This to-scale comparison of Budapest 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.