San Diego is about 61 times smaller than Costa Rica.

Costa Rica is approximately 51,100 sq km, while San Diego is approximately 844 sq km, making San Diego 1.65% the size of Costa Rica.
Tip: This to-scale comparison of Costa Rica vs. San Diego uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.