Kauai is about 1.9 times smaller than Rhode Island.

Rhode Island is approximately 2,706 sq km, while Kauai is approximately 1,435 km² (554 sq mi), making Kauai 53.03% the size of Rhode Island.
Tip: This to-scale comparison of Rhode Island vs. Kauai 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.