California is about 35 times bigger than Qatar.

Qatar is approximately 11,586 sq km, while California is approximately 403,882 sq km, making California 3,386% larger than Qatar. Meanwhile, the population of Qatar is ~2.5 million people (34.7 million more people live in California).
Tip: This to-scale comparison of Qatar vs. California uses the Mercator projection, which distorts the size of regions near the poles.