Amsterdam is about 2.7 times smaller than Wellington.

Wellington (map shows its 57 named neighbourhoods; the area covers the whole city) is approximately 444 sq km, while Amsterdam is approximately 166 sq km, making Amsterdam 37.33% the size of Wellington.
Tip: This to-scale comparison of Wellington 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.