Greece is approximately 131,957 sq km, while Costa Rica is approximately 51,100 sq km, making Costa Rica 38.72% the size of Greece. Meanwhile, the population of Greece is ~10.6 million people (5.5 million fewer people live in Costa Rica).
This to-scale map shows a size comparison of Greece compared to Costa Rica. For more details, see an in-depth quality of life comparison of Costa Rica vs. Greece using our country comparison tool.