San Jose is about 9 times smaller than Bangkok.

Bangkok is approximately 1,569 sq km, while San Jose is approximately 180 sq km, making San Jose 11.47% the size of Bangkok.
Tip: This to-scale comparison of Bangkok vs. San Jose 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.