South Georgia and South Sandwich Islands is about 422 times smaller than Iran.

Iran is approximately 1,648,195 sq km, while South Georgia and South Sandwich Islands is approximately 3,903 sq km, making South Georgia and South Sandwich Islands 0.24% the size of Iran.
Tip: This to-scale comparison of Iran 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. Iran