South Georgia and South Sandwich Islands is about 4.5 times smaller than Swaziland.

Swaziland is approximately 17,364 sq km, while South Georgia and South Sandwich Islands is approximately 3,903 sq km, making South Georgia and South Sandwich Islands 22.48% the size of Swaziland.
Tip: This to-scale comparison of Swaziland 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. Swaziland