New Jersey is about 13 times smaller than Uganda.

Uganda is approximately 241,038 sq km, while New Jersey is approximately 19,211 sq km, making New Jersey 7.97% the size of Uganda. Meanwhile, the population of Uganda is ~46.2 million people (37.4 million fewer people live in New Jersey).
Tip: This to-scale comparison of Uganda vs. New Jersey uses the Mercator projection, which distorts the size of regions near the poles.