South Georgia and South Sandwich Islands is about 26 times smaller than Iceland.

Iceland is approximately 103,000 sq km, while South Georgia and South Sandwich Islands is approximately 3,903 sq km, making South Georgia and South Sandwich Islands 3.79% the size of Iceland.
Tip: This to-scale comparison of Iceland 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. Iceland