Hawaii is about 13 times smaller than Idaho.

Idaho is approximately 214,314 sq km, while Hawaii is approximately 16,635 sq km, making Hawaii 7.76% the size of Idaho. Meanwhile, the population of Idaho is ~1.6 million people (207,281 fewer people live in Hawaii).
Tip: This to-scale comparison of Idaho vs. Hawaii uses the Mercator projection, which distorts the size of regions near the poles.