North Carolina is about 4.1 times bigger than Belgium.

Belgium is approximately 30,528 sq km, while North Carolina is approximately 126,161 sq km, making North Carolina 313% larger than Belgium. Meanwhile, the population of Belgium is ~11.8 million people (2.3 million fewer people live in North Carolina).
Tip: This to-scale comparison of Belgium vs. North Carolina uses the Mercator projection, which distorts the size of regions near the poles.