Porirua is about 3.5 times smaller than Toronto.

Toronto is approximately 630 sq km, while Porirua is approximately 182 sq km, making Porirua 28.94% the size of Toronto.
Tip: This to-scale comparison of Toronto vs. Porirua 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.