Las Vegas is about 2.4 times smaller than Berlin.

Berlin is approximately 891 sq km, while Las Vegas (map shows its 26 named neighbourhoods; the area covers the whole city) is approximately 367 sq km, making Las Vegas 41.23% the size of Berlin.
Tip: This to-scale comparison of Berlin vs. Las Vegas 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.