West Virginia is about 4.3 times smaller than New Zealand.

New Zealand is approximately 268,838 sq km, while West Virginia is approximately 62,361 sq km, making West Virginia 23.2% the size of New Zealand. Meanwhile, the population of New Zealand is ~5.1 million people (3.2 million fewer people live in West Virginia).
Tip: This to-scale comparison of New Zealand vs. West Virginia uses the Mercator projection, which distorts the size of regions near the poles.