Philadelphia is about 1.8 times smaller than Tokyo.

Tokyo is approximately 619 sq km, while Philadelphia is approximately 348 sq km, making Philadelphia 56.2% the size of Tokyo.
Tip: This to-scale comparison of Tokyo vs. Philadelphia 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.