Texas is about 33 times bigger than Slovenia.

Slovenia is approximately 20,273 sq km, while Texas is approximately 678,052 sq km, making Texas 3,245% larger than Slovenia. Meanwhile, the population of Slovenia is ~2.1 million people (23.0 million more people live in Texas).
Tip: This to-scale comparison of Slovenia vs. Texas uses the Mercator projection, which distorts the size of regions near the poles.