Rhode Island is about 1.9 times bigger than Kauai.

Kauai is approximately 1,435 km² (554 sq mi), while Rhode Island is approximately 2,706 sq km, making Rhode Island 89% larger than Kauai.
Tip: This to-scale comparison of Kauai vs. Rhode Island 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.