Miami is about 3.1 times smaller than Salt Lake City.

Salt Lake City is approximately 287 sq km, while Miami is approximately 92 sq km, making Miami 32.17% the size of Salt Lake City.
Tip: This to-scale comparison of Salt Lake City 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.