West Virginia is about 1.3 times bigger than Slovakia.

Slovakia is approximately 49,035 sq km, while West Virginia is approximately 62,361 sq km, making West Virginia 27% larger than Slovakia. Meanwhile, the population of Slovakia is ~5.4 million people (3.6 million fewer people live in West Virginia).
Tip: This to-scale comparison of Slovakia vs. West Virginia uses the Mercator projection, which distorts the size of regions near the poles.