South Georgia and South Sandwich Islands is about 63 times smaller than Guinea.

Guinea is approximately 245,857 sq km, while South Georgia and South Sandwich Islands is approximately 3,903 sq km, making South Georgia and South Sandwich Islands 1.59% the size of Guinea.
Tip: This to-scale comparison of Guinea 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. Guinea