Antwerp is about 3.9 times smaller than Canberra.

Canberra is approximately 814 sq km, while Antwerp (map shows its 62 named neighbourhoods; the area covers the whole city) is approximately 208 sq km, making Antwerp 25.57% the size of Canberra.
Tip: This to-scale comparison of Canberra vs. Antwerp 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.