Rhode Island is about 11 times smaller than Belgium.

Belgium is approximately 30,528 sq km, while Rhode Island is approximately 2,706 sq km, making Rhode Island 8.86% the size of Belgium. Meanwhile, the population of Belgium is ~11.8 million people (10.8 million fewer people live in Rhode Island).
Tip: This to-scale comparison of Belgium vs. Rhode Island uses the Mercator projection, which distorts the size of regions near the poles.