New Zealand is about 12 times bigger than New Hampshire.

New Hampshire is approximately 23,227 sq km, while New Zealand is approximately 268,838 sq km, making New Zealand 1,057% larger than New Hampshire. Meanwhile, the population of New Hampshire is ~1.3 million people (3.7 million more people live in New Zealand).
Tip: This to-scale comparison of New Hampshire vs. New Zealand uses the Mercator projection, which distorts the size of regions near the poles.