Nantucket is about 1.4 times smaller than Aruba.

Aruba is approximately 180 sq km, while Nantucket is approximately 124 km² (48 sq mi), making Nantucket 68.78% the size of Aruba.
Tip: This to-scale comparison of Aruba vs. Nantucket 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.