Hong Kong is about 15 times smaller than Hawaii.

Hawaii is approximately 16,635 sq km, while Hong Kong is approximately 1,108 sq km, making Hong Kong 6.66% the size of Hawaii. Meanwhile, the population of Hawaii is ~1.4 million people (5.9 million more people live in Hong Kong).
Tip: This to-scale comparison of Hawaii vs. Hong Kong uses the Mercator projection, which distorts the size of regions near the poles.