Canberra is about 58 times bigger than Cocos (Keeling) Islands.

Cocos (Keeling) Islands is approximately 14 sq km, while Canberra is approximately 814 sq km, making Canberra 5,716% larger than Cocos (Keeling) Islands.
Tip: This to-scale comparison of Cocos (Keeling) Islands vs. Canberra uses the Mercator projection, which distorts the size of regions near the poles.