Miami is about 1.4 times bigger than Winterthur.

Winterthur is approximately 68 sq km, while Miami is approximately 92 sq km, making Miami 36% larger than Winterthur.
Tip: This to-scale comparison of Winterthur vs. Miami 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.