New Hampshire is about 12 times smaller than New Zealand.

New Zealand is approximately 268,838 sq km, while New Hampshire is approximately 23,227 sq km, making New Hampshire 8.64% the size of New Zealand. Meanwhile, the population of New Zealand is ~5.1 million people (3.7 million fewer people live in New Hampshire).
Tip: This to-scale comparison of New Zealand vs. New Hampshire uses the Mercator projection, which distorts the size of regions near the poles.