Idaho is about 3.4 times bigger than West Virginia.

West Virginia is approximately 62,361 sq km, while Idaho is approximately 214,314 sq km, making Idaho 244% larger than West Virginia. Meanwhile, the population of West Virginia is ~1.9 million people (285,412 fewer people live in Idaho).
Tip: This to-scale comparison of West Virginia vs. Idaho uses the Mercator projection, which distorts the size of regions near the poles.