New Hampshire is about 9 times smaller than Idaho.

Idaho is approximately 214,314 sq km, while New Hampshire is approximately 23,227 sq km, making New Hampshire 10.84% the size of Idaho. Meanwhile, the population of Idaho is ~1.6 million people (251,112 fewer people live in New Hampshire).
Tip: This to-scale comparison of Idaho vs. New Hampshire uses the Mercator projection, which distorts the size of regions near the poles.