Oakland is about 4 times smaller than Canberra.

Canberra is approximately 814 sq km, while Oakland is approximately 202 sq km, making Oakland 24.81% the size of Canberra.
Tip: This to-scale comparison of Canberra vs. Oakland 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.