Prague is about 1.4 times smaller than Tehran.

Tehran is approximately 686 sq km, while Prague is approximately 496 sq km, making Prague 72.33% the size of Tehran.
Tip: This to-scale comparison of Tehran 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.