Missoula is about 1.8 times smaller than Amsterdam.

Amsterdam is approximately 166 sq km, while Missoula (map shows its 17 named neighbourhoods; the area covers the whole city) is approximately 91 sq km, making Missoula 54.73% the size of Amsterdam.
Tip: This to-scale comparison of Amsterdam vs. Missoula 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.