South Carolina is about 28 times smaller than Saudi Arabia.

Saudi Arabia is approximately 2,149,690 sq km, while South Carolina is approximately 77,983 sq km, making South Carolina 3.63% the size of Saudi Arabia. Meanwhile, the population of Saudi Arabia is ~35.4 million people (30.7 million fewer people live in South Carolina).
Tip: This to-scale comparison of Saudi Arabia vs. South Carolina uses the Mercator projection, which distorts the size of regions near the poles.