Svalbard is approximately 62,045 sq km, while Belgium is approximately 30,528 sq km, making Belgium 49.2% the size of Svalbard. Meanwhile, the population of Svalbard is ~2,926 people (11.7 million more people live in Belgium).
This to-scale map shows a size comparison of Svalbard compared to Belgium. For more details, see an in-depth quality of life comparison of Belgium vs. Svalbard using our country comparison tool.