South Georgia and South Sandwich Islands is about 8 times smaller than Belgium.

Belgium is approximately 30,528 sq km, while South Georgia and South Sandwich Islands is approximately 3,903 sq km, making South Georgia and South Sandwich Islands 12.78% the size of Belgium.
Tip: This to-scale comparison of Belgium vs. South Georgia and South Sandwich Islands uses the Mercator projection, which distorts the size of regions near the poles.
Compare further: South Georgia and South Sandwich Islands vs. Belgium