Alaska is about 49 times bigger than Belgium.

Belgium is approximately 30,528 sq km, while Alaska is approximately 1,481,348 sq km, making Alaska 4,752% larger than Belgium. Meanwhile, the population of Belgium is ~11.8 million people (11.1 million fewer people live in Alaska).
Tip: This to-scale comparison of Belgium vs. Alaska uses the Mercator projection, which distorts the size of regions near the poles.