Maine is about 3.4 times smaller than New Zealand.

New Zealand is approximately 268,838 sq km, while Maine is approximately 79,931 sq km, making Maine 29.73% the size of New Zealand. Meanwhile, the population of New Zealand is ~5.1 million people (3.7 million fewer people live in Maine).
Tip: This to-scale comparison of New Zealand vs. Maine uses the Mercator projection, which distorts the size of regions near the poles.