Paris is about 3.3 times smaller than Philadelphia.

Philadelphia is approximately 348 sq km, while Paris is approximately 105 sq km, making Paris 30.3% the size of Philadelphia.
Tip: This to-scale comparison of Philadelphia vs. Paris 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.