Amsterdam is about 1.9 times smaller than Henderson.

Henderson (map shows its 23 named neighbourhoods; the area covers the whole city) is approximately 313 sq km, while Amsterdam is approximately 166 sq km, making Amsterdam 52.9% the size of Henderson.
Tip: This to-scale comparison of Henderson 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.