Winterthur is about 9 times smaller than Toronto.

Toronto is approximately 630 sq km, while Winterthur is approximately 68 sq km, making Winterthur 10.8% the size of Toronto.
Tip: This to-scale comparison of Toronto vs. Winterthur 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.