Amsterdam is about 2.2 times smaller than Las Vegas.

Las Vegas (map shows its 26 named neighbourhoods; the area covers the whole city) is approximately 367 sq km, while Amsterdam is approximately 166 sq km, making Amsterdam 45.12% the size of Las Vegas.
Tip: This to-scale comparison of Las Vegas vs. Amsterdam 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.