Atlanta is about 1.8 times smaller than Tokyo.

Tokyo is approximately 619 sq km, while Atlanta (map shows its 114 named neighbourhoods; the area covers the whole city) is approximately 350 sq km, making Atlanta 56.62% the size of Tokyo.
Tip: This to-scale comparison of Tokyo vs. Atlanta 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.