New Jersey is about 4.9 times bigger than South Georgia and South Sandwich Islands.

South Georgia and South Sandwich Islands is approximately 3,903 sq km, while New Jersey is approximately 19,211 sq km, making New Jersey 392% larger than South Georgia and South Sandwich Islands.
Tip: This to-scale comparison of South Georgia and South Sandwich Islands vs. New Jersey uses the Mercator projection, which distorts the size of regions near the poles.

Compare further: New Jersey vs. South Georgia and South Sandwich Islands