West Virginia is about 3.4 times smaller than Idaho.

Idaho is approximately 214,314 sq km, while West Virginia is approximately 62,361 sq km, making West Virginia 29.1% the size of Idaho. Meanwhile, the population of Idaho is ~1.6 million people (285,412 more people live in West Virginia).
Tip: This to-scale comparison of Idaho vs. West Virginia uses the Mercator projection, which distorts the size of regions near the poles.