Alaska is about 29 times bigger than Costa Rica.

Costa Rica is approximately 51,100 sq km, while Alaska is approximately 1,481,348 sq km, making Alaska 2,799% larger than Costa Rica. Meanwhile, the population of Costa Rica is ~5.2 million people (4.5 million fewer people live in Alaska).
Tip: This to-scale comparison of Costa Rica vs. Alaska uses the Mercator projection, which distorts the size of regions near the poles.