Prague is about 1.3 times smaller than Jakarta.

Jakarta is approximately 662 sq km, while Prague is approximately 496 sq km, making Prague 74.96% the size of Jakarta.
Tip: This to-scale comparison of Jakarta vs. Prague 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.