Atlanta is about 2.2 times smaller than Edmonton.

Edmonton is approximately 768 sq km, while Atlanta (map shows its 114 named neighbourhoods; the area covers the whole city) is approximately 350 sq km, making Atlanta 45.64% the size of Edmonton.
Tip: This to-scale comparison of Edmonton 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.